Inspirational perspectives and principles on the use of catalysts to create sustainability
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Ca alysis Today xxx (xxxx) xxx
Please ci e his a icle as: Juan Ga cía-Se na, Ca alysis Today, h ps://doi.o g/10.1016/j.ca od.2021.11.021
A ailable online 19 No embe 2021
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Inspi a ional pe spec i es and p inciples on he use o ca alys s o
c ea e sus ainabili y
Juan Ga cía-Se na
a
,
*
, Raúl Pi˜
ne o-He nanz
b
, Desi ´
ee Du ´
an-Ma ín
b
a
G upo de Tecnologías a P esi´
on (P essTech), Ins i u o de Bioeconomía de la Uni e sidad de Valladolid (BioEcoUVa), Depa amen o de Ingenie ía Química y Tecnología
del Medio Ambien e, Escuela de Ingenie ías Indus iales, Uni e sidad de Valladolid, 47011 Valladolid, Spain
b
Bio echnology and Sus ainable Chemis y A ea, Cen e o Technology CARTIF, Pa que Tecnol´
ogico de Boecillo, 205, 47151 Boecillo, Valladolid, Spain
ARTICLE INFO
Keywo ds:
Ca alysis p inciples
G een chemis y
G een enginee ing
Sus ainable ca alysis
Cleane p ocesses
ABSTRACT
Mos o he p oduc s on which ou wel a e s a e is based a e composed o chemicals. The g ow h o he wo ld’s
popula ion, i s ageing and he con inuous imp o emen o wel a e s a e aspi a ions augu an inc ease in he
needs o all hese e e yday p oduc s in ou li es. A high pe cen age o hese chemicals a e syn hesised using
ca alysis. In his pe spec i e pape , we highligh he impo ance o ca alysis, which is a he hea o chemical
p ocesses, and he e o e one o he ools o c ea ing p oduc s ha d i e sus ainabili y. We ha e compiled wel e
me hodological bes p ac ices in ca alys design and concep ion ha can se e as inspi a ion o he c ea ion and
imp o emen o ca alys s. We include some applica ion examples o illus a e his.
1. In oduc ion
The idea o sus ainabili y has been a ound o a long ime bu has
gained conside able momen um in he las i e yea s wi h he global
campaign o he 17 Sus ainable De elopmen Goals (SDGs). Sus ain-
abili y does no jus mean li ing well and allowing ou u u e gene a-
ions o do he same. I is a p o ound concep ha akes in o accoun
h ee basic pilla s: he economy, he en i onmen and socie y. These
pilla s ha e o be based on a le el playing ield, no only o u u e
gene a ions bu also o oday’s gene a ion. These pilla s a e unde -
pinned by equali y and a e cons an ly e ol ing h ough he my iad
disciplines o science, enginee ing, a chi ec u e, medicine, poli ics, he
a s, humani ies and cul u e o he ulles ex en . By ge ing down o
ea h, e e y discipline can play a pa in pa ing he way owa ds a
sus ainable socie y.
Chemis y and chemical enginee ing a e a he basis o ou daily
li es, p o iding he main p oduc s ha mee ou demands and needs o
main ain and imp o e ou s a e o well-being.
The p inciples o g een chemis y es ablished a use - iendly
amewo k o sus ainable p ocess design wi h a co e in chemis y. In
1998 Paul Anas as and John Wa ne we e able o dis il om he bes
p ac ices o chemis y, eal and a o dable p ac ices ha we e al eady in
applica ion [1]. Mo e han wen y yea s la e , g een chemis y is al eady
a co e discipline in mos chemis y acul ies and companies a ound he
wo ld, al hough a eal push is s ill needed o make i a pe manen
eali y.
Among he p inciples o g een chemis y, one ha inco po a es
conside able imp o emen s in all he o he s is ca alysis. Ca alysis makes
i possible o make ma e ials eac ha did no p e iously do so, opening
up he possibili y o using enewable, sa e o mo e eadily a ailable
ma e ials. I also makes i possible o educe ope a ing condi ions in
e ms o p essu e and empe a u e, wi h consequen ene gy sa ings.
Ca alysis is a he hea o mos chemical p ocesses. Nine y- i e pe
cen o chemicals in indus y, which is equi alen o 80 pe cen o hei
added alue, a e syn hesised using ca alys s. O hese, he e ogeneous
ca alysis accoun s o almos 80%, homogeneous ca alysis o 15% and
he es is bioca alysis [2]. In many cases, he op imisa ion o hese
p ocesses is so e ined ha i is e y di icul o imp o e hem u he . In
such ci cums ances we mus ind he b eak h ough by app oaching he
hea , he ca alys .
In his pe spec i e pape , we would like o ecapi ula e on wel e
cu en ends ha can be o g ea use o he de ini ion o new ou -o -
he-box ca alys s ha in insically p omo e sus ainabili y om wi hin
p ocesses. Wi h he help o hese basis and a dash o c ea i i y, we
belie e ha exis ing ca alys s can be imp o ed, bu also new, game-
changing ca alys s can be c ea ed.
* Co esponding au ho .
E-mail add ess: [email p o ec ed] (J. Ga cía-Se na).
Con en s lis s a ailable a ScienceDi ec
Ca alysis Today
jou nal homepage: www.else ie .com/loca e/ca od
h ps://doi.o g/10.1016/j.ca od.2021.11.021
Recei ed 27 Sep embe 2021; Recei ed in e ised o m 2 No embe 2021; Accep ed 9 No embe 2021
Ca alysis Today xxx (xxxx) xxx
2
2. Basic p inciples o ca alysis owa ds sus ainabili y
2.1. Ac i e me al
Use ac i e me als ha a e accessible, s able and low-cos . A oid he use o
endange ed, oxic o dange ous me als.
In mos ca alys s, me als a e a he co e o hei ca aly ic ac i i y and
pe o mance. The e o e, e o s o de elop a mo e sus ainable ca alysis
mus conside he sus ainabili y o ac i e me als. The assessmen o his
cha ac e is ic can be ocused on h ee main aspec s: i) a ailabili y, ii)
low cos , and iii) oxici y. In e ms o a ailabili y and cos , he e a e
majo di e ences depending on he ype o me als, being hose called
p ecious me als a less a ailable and mo e expensi e han hose
e e ed as base me als. P ecious me als a e in he second and hi d ows
o he pe iodic able and hose commonly used as ansi ion-me al ca -
alys s a e P , Pd, Rh, Ru, Os, I , Au and Ag. They lack abundance in he
Ea h c us al, and ha de e mines hei high cos and luc ua ions in
p ice and supply. Fo example, in he pe iod be ween 2018 and 2019,
a e age palladium and hodium p ices we e up 20% and 83% espec-
i ely, while he pla inum p ice declined 11% compa ed o he same
pe iod las yea [3]. The B i ish Geological Socie y eleased a lis o
me als a isk o supply dis up ion whe e he pla inum-g oup me als
( u henium, hodium, palladium, osmium, i idium, and pla inum) a e
es ima ed o be a he highes isk [4]. In addi ion o he ob ious
economical and supply conce ns ela ed o p ecious me als, hey also
ha e en i onmen al implica ions. Ac ually, mining and e inemen o
hese ma e ials equi e a la ge use o ene gy and emi la ge amoun s o
CO
2
[5]. E en hough hei high demand and sca ci y, i is es ima ed ha
less han 1% o p ecious me als a e ecycled o euse. This low pe -
cen age is due o he low economic iabili y o ecycling p ocesses,
which o en equi e la ge amoun s o wa e and highly co osi e acids,
while gene a ing la ge amoun s o was e.
In his scena io, a cu en app oach in he de elopmen o mo e
sus ainable ac i e me als elies on he use o high c us al abundan
me als e e ed as base me als. Ti anium, anadium, ch omium, man-
ganese, i on, cobal , nickel, and coppe , ep esen base me als wi h
ad an ages o e he use o pla inum-g oup me als such as low cos ,
global a ailabili y and lowe oxici y. P og ess is being made in ecen
yea s o enhance he eac i i y o base me als and o e come disad an-
ages like lowe s abili y, selec i i y and changing oxida ion [5]. Despi e
base me al ca alys s ha e been p o ed eliable o some eac ions,
u he esea ch is needed o con i m hei easibili y in o he eac ions
adi ionally pe o med wi h p ecious me als, which will lead o sub-
s an ial bene i s o he u u e socie y and en i onmen .
Rega ding oxici y, base me als a e o en conside ed less oxic han
p ecious me als wi h minimal sa e y conce ns. Howe e , he assessmen
o oxici y is complex. Ac ually, se e al wo ks epo ed ha widely
conside ed hea y and oxic me als such as palladium, pla inum, and
gold compounds may no be so dange ous, while complexes o nickel
and coppe , gene ally assumed as g een and sus ainable op ions, may be
signi ican ly oxic (i.e., due o hei solubili y in wa e and biological
luids) [6]. A pionee wo k ecen ly epo ed a comp ehensi e com-
pa ison o he oxici y o 18 me als ypically used in ca alysis based on
mul ic i e ia analysis conside ing pa ame e s such as he oxici y o pu e
me als and me al sal s owa d ish, Daphnia magna, and algae/plan s,
me al oxici y owa d a s ia inges ion, ca cinogenici y, he endan-
ge men deg ee o me als, he boiling poin and ene gy o a om
de achmen [7]. Thei conclusions we e simila o hose ound in p e-
ious wo ks [6] and showed u henium, molybdenum, pla inum and
manganese as he mos a ou able (less oxic) ac i e me als, in con as
o nickel, cobal , and palladium as he mos oxic.
2.2. Designed in-silico
Design he ca alys using he bes a ailable in-silico echniques o op imise
esou ces dedica ed o es ing and speed-up he de elopmen .
He e ogeneous ca alysis exhibi s an inhe en design, in en ion di -
icul y and equi ed e o as i combines a omic, mic oscopic, meso-
scopic, and mac oscopic scales. I in ol es he modynamics, eac ion,
adso p ion/deso p ion and mass ans e .
The obse a ion o he eac ion can be done by compu a ional
me hods, bu eaching chemical accu acy (e o lowe han 1
kcal⋅mol
−1
) is limi ed o ew a oms. The calcula ion can be simpli ied by
using Densi y Func ional Theo y (DFT), which allows he simula ion o
up o 100 a oms, a he cos o conside ably educed accu acy. La ge
a eas canno be simula ed due o he high compu a ional powe equi ed
[8]. Fu he mo e, he e a e a numbe o g and challenges in he
compu a ional ca alysis ha s ill ha e o be sol ed, e.g. exponen ially o
a e o eac ion wi h ene gy ba ie , complexi y o ligands in homoge-
neous ca alysis, su ace in e ac ions wi h he ac i e me al in he e oge-
neous ca alysis o he di icul y o modelling elec on and p o on
ans e s eps in elec o-ca alysis [9].
Ab ini io a omis ic he modynamics can be used oge he wi h DFT o
in es iga e he in luence o empe a u e, p essu e o composi ion in he
su ace ee ene gies.
The unde s anding o he eac ion implies he p edic ion o eac ion
mechanism and eac ion pa hway, oge he wi h he kine ics. Mic o-
kine ic modelling can be done, o ins ance, by combining he La ice-
gas Hamil onian (LGH) wi h Mon e-Ca lo (MC) simula ions [10].
Machine Lea ning (ML) and Deep Lea ning (DL) echniques allow o
he as calcula ion o hese a omis ic p ope ies, e.g. binding ene gy,
using p e ious da a om DFT o MC simula ions.
Saxena e al. sc eened he ca aly ic op ions o e hanol decomposi-
ion and non- oxida i e dehyd ogena ion eac ions [11]. Single a om
alloys and bime allic alloys we e analysed using ML, op imising he
binding ene gies o oxygen and ca bon s a ing om well-known p op-
e ies. A e selec ing a p ope alloy an ab ini io mic okine ic model was
applied o es ima e he pe o mance ( u n o e equency, TOF). The
calcula ion ook less han a second.
Kine ic expe imen s will in many cases be una oidable, bu he use o
compu a ional echniques can g ea ly educe esou ces and ime spen .
The igh combina ion o simula ion p edic ion and expe imen al e i-
ica ion is he key o imp o emen in he medium and long e m.
2.3. Scalable ab ica ion
New imp o ed ca alys s suppo s/s uc u es and hei manu ac u ing
echniques a e aimed o acili a e he pe o mance o eac o s a la ge/in-
dus ial scale.
Some examples o scalable-easy-manu ac u ing ca alys s may be
ocused on he enhancemen o design and ab ica ion o he ca alys a
mac o-le el in o de o op imise he mass/hea ans e and o e all
pe o mance o he ca aly ic eac o sys em [12].
Mo eo e , he applicabili y o he ca alys is inc eased i i can be
p epa ed in di e en o ma s, i.e. powde , pelle s, oams, monoli hs, e c.
3D p in ing allows o a e y speci ic and ailo ed design o mass
ans e and low p essu e d op. Special a en ion has o be aken o he
binde s used [13].
2.4. Fas induc ion and in-si u ac i a ion
Fas induc ion pe iods a e desi ed, sa ing ime and ma e ials. In-si u
ac i a ion eases he handling and ac i i y.
Fas induc ion a es allow ca alys s o each hei op imum ac i i y
(highes con e sion and selec i i y) in sho pe iod imes since hey a e
ac i a ed, which bene i he pe o mance o he eac ion and inc ease
he p oduc i i y, sa ing ime and ma e ials.
In-si u ac i a ion also eases ca alys handling and ac i i y. Thus, a
speci ic ca alys design/p epa a ion aimed a sho ening he induc ion
pe iod o he ca alys o imp o ing he ac i a ion p ocedu e (i.e.
educing ime/ene gy consump ion, o e en ually, imp o ing he ca a-
lys s pe o mance o s abili y) may ha e a signi ican impac on he
J. Ga cía-Se na e al.
Ca alysis Today xxx (xxxx) xxx
3
o e all pe o mance and ime li e o a ca alys , hus imp o ing i s
p ope ies as a mo e s able and e icien ma e ial, and hus i s sus ain-
abili y in e ms o cos and en i onmen impac [14]. One example is
imp o emen s in he design o ca alys s o me hane
dehyd o-a oma isa ion (MDA) eac ion, in which a speci ic mixed o
me als (Fe, P ) o dope he ac i e phase is able o p omo e a apid o -
ma ion o he ac i e si es and, in addi ion, o wi hs and sin e ing/ag-
glome a ion, hus, imp o ing he s abili y and op imal pe o mance o
he ca alys and also inhibi ing he accumula ion o coke on he ex e nal
su ace o he ca alys du ing he eac ion [15,16].
2.5. S abili y
Design o s abili y, o a oid poisoning, deg adabili y and leaching.
Despi e ca alys s a e no consumed du ing eac ion, hei s abili y is
limi ed and end o deac i a e wi h p olonged eac ion imes. Ca alys
deac i a ion leads o a signi ican dec ease in p ocess yield and selec-
i i y wi h p oduc ion o undesi able componen s. The e o e, dec easing
o a oiding deac i a ion is essen ial o imp o e sus ainabili y in ca al-
ysis and hus educing he need o eplace spen ca alys s wi h con-
sump ion o new ma e ials, ene gy and wa e . A he same ime,
imp o ed s abili y may enhance he e iciency o he chemical p ocess
sa ing ope a ion cos and dec easing he p oduc ion o pollu an s and
undesi ed by-p oduc s.
In o de o design s able ca alys s, i is pa amoun o unde s and hei
speci ic deac i a ion easons. The mos common ones a e summa ised
below along wi h some s a egies applied o o e come hem.
i) Poisoning by componen s in eagen s o eac ion in e media es. A
ypical example o poisoning occu s du ing hyd oca bon p o-
cessing whe e sulphu is p esen in some eagen molecules
(me cap ans, hiophenes…). Sulphu is s ongly chemiso bed
o e me allic su ace o ca alys (and may o m s able me al
sulphides) and disables i s ca aly ic ac i i y. CO is ano he well-
known poison o ca alys s. This is a c i ical issue in uel cells
ed wi h hyd ogen p oduced om hyd oca bons. Small p esence
o CO in he hyd ogen eed (o e 20 ppm) leads o quick deac-
i a ion o P ca alys in he anode o he cell since i is adso bed
o e he P su ace o ming s able P -C bonds. Ano he ypical
example o poison is coke. I is an undesi able by-p oduc p o-
duced du ing hyd oca bon p ocessing a high empe a u es. I
does no o m chemical compounds wi h me als o suppo s.
Howe e , i g ows o e he ca alys su ace and blocks he access
o eagen s o he ca aly ic ac i e si es.
ii) Sin e ing, desc ibed as a compac ion and densi ica ion o ac i e
me als o suppo s, equen ly occu s when a ca alys is subjec ed
o high empe a u es. In suppo ed ca alys s, high empe a u es
leads o a nuclea ion o he dispe sed me allic pa icles and hei
agg ega ion in he o m o la ge c ys als wi h subsequen loss o
ac i e si es exposed o eagen s. The consequence o his p ocess
is a dec ease o he ca aly ic ac i i y. Ca aly ic suppo s also
su e om his compac ion p ocess and collapse o hei po ous
ex u e. The ou come is a educ ion o he su ace a ea o he
ca alys , diminishing he ac i e si es exposed o eagen s. Simila
compac ion e ec s ake place in bulk ca alys s lowe ing hei
ca aly ic ac i i y.
iii) Loss o ca alys componen s in he eac ion media. These phe-
nomena occu in liquid phase ca alysis (eg. he lixi ia ion o Ca
om ca alys s du ing syn hesis o biodiesel) bu also in gas phase
eac ions, when me al pa icles o ce ain elemen s ola ise unde
high empe a u es (eg. RuO
2
is oxidised and o ms gaseous RuO
3
and RuO
4
molecules). Ano he example unde his sec ion is he
dealumina ion o zeoli es used as ca alys s o ca aly ic suppo s
when subjec ed o ha sh hyd o he mal condi ions.
Di e en s a egies ha e been applied o imp o e he s abili y o
ca alys s and o e come o educe hei deac i a ion. Fo example, he
addi ion o lan hanides (usually La o Ce oxides) o ca aly ic suppo s
p omo e he o ma ion o ca bona e and hyd oxyl in e media es du ing
eac ion which con ibu e o he gasi ica ion o coke p oduced om
hyd oca bons p ocessing [17].
Sulphu aps a e also used o p e e en ially adso b i and a oid he
con amina ion o he ac i e me al si es. The Ellingham diag am o me al
sulphides is an in e es ing ool o choose he igh componen s o hese
aps since i shows ee ene gy o o ma ion o di e en sulphides a
di e en empe a u es. A ecen example is he use o Mn oxides as
sulphu aps in emission con ol ca alys s [18].
In o de o a oid sin e ing o alumina suppo s, manu ac u e s ha e
enginee ed op imised o mula ions by o ming highly he mally s able
alumina es (e.g. LaAlO
3
) in he su ace o alumina. Despi e he educ ion
o he su ace a ea o he no el suppo , he s abili y o i s po ous ex u e
unde high empe a u e is g ea ly imp o ed.
Zeoli e ca alys s used in luid ca aly ic c acking p ocesses usually
su e om dealumina ion by s eam a high empe a u es. A s a egy o
add ess his issue is by enginee ing he zeoli es wi h he addi ion o a e-
ea h elemen s and phospho us [19].
2.6. Biomime ic
Ca alys s designed by na u e a e e y e ec i e, wo k a ambien condi-
ions and a e e y speci ic by using molecula ecogni ion (sel -assembly).
John Wa ne , one o he ea ly ounde s o G een Chemis y, illus-
a es e y well how he basis o mode n chemis y is based on collision
eac ions. The p obabili y o collision is inc eased by inc easing p essu e
and empe a u e [20]. A he same ime, he poin s ou ha his model
di e s g ea ly om na u e, whe e he e is no single collision eac ion. In
na u e, molecules app oach, ecognise, "snuggle" each o he and hen
eac a ambien p essu e and empe a u e.
Mo eo e , Janine Benyus opened a simple way o design inspi ed by
na u e. Biomimic y akes na u e as a model, as a men o and as a
measu e. Ca alys s exis in na u e, i is he only way o c ea e e icien
and e ec i e eac ions a oom empe a u e and a mosphe ic p essu e.
Di ec ly designing an enzyme is s ill a long way o , bu mimicking
hem is now possible. The e a e se e al possible op ions o c ea ing
biomime ic me al o ganic amewo k (MOF) ca alys s as explained by
Chen and Chuan [21]:
•Using me als as biomime ic ac i e si es.
•Encapsula ion o p e en sel -agg ega ion and inc ease shel li e.
•Newly c ea ed suppo o amewo k based on a simila biomime ic
s uc u e.
•Inco po a ion o biomime ic pa s ia o ganic linke s
•Pos -syn hesis modi ica ion
The adi ional chemis y o p epa ing imines om aldehydes, ke-
ones, amines, ni iles and o he s is well known. Bu o all he possible
me hods, e e ence was a ely made o how na u e does i . Speci ically,
coppe amine oxidases (CuAOs) a e esponsible o hese p ocesses o
con olling he me abolism o amines o di e en ypes. Bioinspi ed by
CuAOs, quinone-based ca alys s ha e been de eloped [22].
2.7. Ci cula by p ocess design o o igin o he esou ce
The ca alys should be designed o be ci cula in he suppo , ac i e me al
and addi i es.
A ca alys based on he ci cula economy can be de eloped based on
di e en app oaches, which ypically ake in o accoun he en i e
ca alys alue chain, om he o igin and esou ces o he ma e ials he
ca alys is made o , o he a e -li e o he ca alys , and key impac /
sus ainabili y pa ame e s such as he ca bon oo p in o he
manu ac u ing p ocess. Di e en app oaches may be conside ed o
quali y a ca alys as sus ainable based on he ci cula i y o a ca alys , as
J. Ga cía-Se na e al.
Ca alysis Today xxx (xxxx) xxx
4
ou lined below:
I. Ci cula by o igin o he aw ma e ials/ esou ces:
P esen ly, mos o he ca aly ic ma e ials a e sou ced om
ini e geological deposi s. By eco e ing ca alys om was e and
eclama ion o ac i e me als om spen ca alys , he dependence
on na u al esou ces ha a e unsus ainable will be educed,
likewise he quan i y o ma e ials going o land ill. A ci cula
economy pe spec i e, conside ing he E-was e managemen
along wi h he eco e y o noble me als om spen ca alys s, can
be conside ed as a new concep o ca alys c adle- o-c adle p o-
cess and, e en ually, a p omising sus ainable sou ce o ca aly ic
ma e ials manu ac u ing [23–26]. An example o his eme ging
ci cula alue chain is he eco e y o he aluable me als om
indus ial and pos -consuming p oduc s such as elec onic was e
ma e ials (E-was e). Acco ding o he Global E-was e Moni o
2020 [27], E-was e is he wo ld’s as es g owing was e s eam
and he amoun is es ima ed o inc ease o 52.2 million me ic
onnes by 2021 and he end could be going up o each he
amoun will each 74 million M . in 2030. The inc easing gen-
e a ion and accumula ion o E-was e is clea ly poin ing o a
c i ical en i onmen al challenge which needs o be add essed in
he immedia e u u e. Thus, he design o enewable ca alys
made om was e ma e ials o a ca alys based on ecycled ma-
e ials is an al e na i e clea ly mo e sus ainable, especially when
i is aimed a p ecious me als which a e mo e di icul , expensi e
-and en i onmen -cos ly- o ex ac (e.g. Au, P , Pd, Ru, e c.) [28,
29]. In addi ion, he eco e y o aluable mine als om indus-
ial e luen s ea men and leaching p ocess in mining exploi-
a ions a e po en ial applica ions han can be de elop as po en ial
case exploi a ions based o ci cula -by p ocess/design [30,31].
To ha end, se e al s a egies ha e been epo ed o me als e-
co e y om E-was e and indus ial s eams, al hough he e is s ill
a long way o go o ind en i onmen ally iendly and e icien
p o ocols in his ega d [30,32]. In combina ion wi h Sec ion 2.1,
when he use o noble me als is equi ed (as subs i u ion is no
possible), inding sus ainable ecycling me hods and s a egies
will be he key o success.
II. Ci cula by he manu ac u ing and pe o mance p ocess design:
Ca alys s ha use g een/clean echnologies o hei ab ica-
ion in ol e he u ilisa ion o ewe na u al esou ces, educing
pollu ion and was e, ecycling and/o eusing ma e ials, and
p oducing mode a e emissions in hei p ocesses. All hese inpu s
lead he manu ac u ing p ocess o consume less ene gy and e-
sou ces making he ab ica ion o he ca alys i sel mo e sus-
ainable and cos -compe i i e han o he con en ional p ocesses
[28]. The g een echnologies mos equen ly encoun e ed a e he
ecycling o was e, was e wa e ea men and enewable ene gy,
o ins ance, he applica ion on new hie a chical- i anium diox-
ide ca alys s, which include ac i e mic opo ous zeoli es and
mesopo ous ma ix o di usion, allows o inno a i e g een
applica ions such as he syn hesis o uels om ca aly ic c acking
o was e plas ics [33].
III. Ci cula by he end-use o applica ion o he ca alys :
A ca alys may be also conside ed sus ainable i i has been designed
o special applica ions ocused on clima e change mi iga ion, e.g.
h ough he p oduc ion o ca bon-nega i e p oduc s and uels (CO
2
- o-
chemicals p ocesses), elimina ion o pollu ion om indus ial/human
ac i i y in he wo ld, e c. [34,35]. Addi ionally, he ca alys s o au o-
mobile emission con ol a e based on p ecious me als such as pla inum,
palladium, and hodium. A p esen , mo e han 15 in e na ional com-
panies a e p oducing abou 100 undamen al ypes o solid ca alys s.
Ca alys s play an essen ial ole in indus y no only in economic e ms
bu also in educing pollu ion o he en i onmen [36].
2.8. Use o enewable esou ces
Ac i e ca alys s wi h enewable ma e ials may help in he ans o ma ion
o ou oil-based socie y in o a bio-based socie y.
Ac i e ca alys s wi h enewable ma e ials can help ans o m ou
pe oleum-based socie y in o a bio-based socie y, o example by p o-
ducing chemical building blocks de i ed om CO
2
, such as C1 molecules
(me hane, me hanol, o maldehyde) o di e en C2-C4 molecules
anging om e hylene/ole ins ma e ials o o he long-chain hyd oca -
bons, o e en o e ing an al e na i e o he cu en p oduc ion o
p oduc s om c ops o o he bio-based ma e ials (e.g. ag icul u al es-
idues such as e penes, a y acids and lipids can be used as bio-based
pla o m chemicals o he p epa a ion o biopolyme s). Fo example,
ag icul u al esidues such as e penes, a y acids and lipids can be used
as bio-based chemicals o he p epa a ion o biopolyme s [37,38].
In addi ion, ac i e ca alys s owa ds biomass and na u al p oduc s
con ibu e o he deca bonisa ion o indus y and he economy o boos
he ans o ma ion o ou oil-based socie y in o a bio-based socie y.
The e a e se e al examples o new ca alys s speci ically designed o he
ans o ma ion o biomass in o bio uels and enewable chemicals. These
ca alys s will play an impo an ole in in eg a ed bio e ine ies and bio-
based indus ies in he u u e [39]. As an example, one o he mos
p omising he e ogeneous ca aly ic p ocesses in biomass being s udied is
he p oduc ion o u u al. Fu u al is a C5 building block ha can be
con e ed in o a la ge numbe o alue-added chemicals and bio-
chemicals, as well as p oducing ad anced syn he ic uels [40].
2.9. Aligned wi h SGDs
The p oduc may help in he ad ance o socie y owa ds sus ainabili y.
The a ge o he main p oduc should be aligned wi h one o se e al o he
SDGs.
Humani y aces majo challenges ha a ec billions o li es. In he
las 50 yea s he wo ld’s popula ion has doubled om 3.8 billion o 7.8
billion people. The ounda ions o sus ainabili y we e ou lined in he
epo Wo ld Commission on En i onmen and De elopmen in 1987
[41]. Fa om ocusing only on he classical de ini ion ha e e s o he
i s line o he epo , he e m sus ainabili y is e y deep and di icul o
unde s and and o de ine clea ly. I is linked o he wel a e s a e wi h i s
needs, aspi a ions and he indi idual in e p e a ion o each o hem
[42]. These ideas ha e been ansla ed o e he yea s in o a ious join
global ac ions, such as he millennium goals. Howe e , i was no un il
2015 wi h he es ablishmen o he 17 Sus ainable De elopmen Goals
(SDGs) ha he e has been a eal ake-o and a global unde s anding,
no only by c ea o s, bu also by companies, media and public opinion
[43]. So much so ha clea e e ences o he di e en goals can now be
ound in p ac ically all p oduc s, p ocesses and o ganisa ions.
F om a simplis ic poin o iew, he wel a e s a e, i s needs, a e
sa is ied h ough p oduc s (unde s anding p oduc in a global way). The
inc ease in popula ion comes wi h an inc ease in he numbe o needs
and he e o e an inc ease in he consump ion o p oduc s. The inhe en
aspi a ion o imp o e he wel a e s a e o each indi idual also inc eases
i .
Chemis y and chemical enginee ing a e a he ounda ion o he
c ea ion o a ious commodi ies: ood, medicines, cons uc ion, ans-
po , communica ions, packaging, clo hing and o he s. Ca alysis and
ca alys s ha e no only accele a ed he kine ics o eac ions a he mo-
lecula le el, hey ha e se ed o accele a e he de elopmen o he
wel a e socie y by gi ing uni e sal access o all hese p oduc s. Ca alysis
has helped o educe he consump ion o aw ma e ials and ene gy and
o a oid mo e oxic o dange ous p oduc ion ou es, o example.
Some imes when we a e in ou labs ying o c ea e a new ca alys o
imp o ing one o i s p ocesses we lose pe spec i e, we look oo close by
zooming in. We a e e y ocused on educing he empe a u e by 1 ◦C o
he p essu e by 1 ba o he amoun o ca alys by 1 mg o make i mo e
sus ainable. Bu we ha e no s opped o hink abou wha his eally
J. Ga cía-Se na e al.
Ca alysis Today xxx (xxxx) xxx
5
means.
Zooming ou will help us unde s and why ou ac ions in de eloping a
ca alys con ibu e o imp o ed global sus ainabili y. And mo e impo -
an ly i will gi e us ex a mo i a ion o con inuous imp o emen .
Johnson Ma hey has de eloped his idea in i s GRI epo in which i
analyses some o he global needs and explains i s s a egy a he p oduc
de elopmen le el (ca alys s) o con ibu e globally [3]. Fo example,
hey es ima e ha he demand o hyd ogen will inc ease en old in he
coming yea s and p esen a po olio o ca aly ic echnologies o i s
gene a ion. They a e also looking a scaling up uel cell p ocesses o
elec ici y p oduc ion by hyd ogen con e sion.
2.10. Low impac subp oduc s
Ca alys s should be designed o a oid subp oduc s o o minimise hei
en i onmen al and economic impac .
A oiding he o ma ion o undesi able side p oduc s p e en s he
was e o chemicals, minimises he need o pu i ica ion s eps, a ec s he
ene gy consump ion o subsequen sepa a ion p ocesses and makes he
p ocesses mo e en i onmen ally iendly [13]. Ac ually, ca alys selec-
i i y di ec ly de e mines he a omic economy o he ca aly ic p ocess.
The e o e, he sma design o he e ogeneous ca alys s should
imp o e hei selec i i y by a oiding he o ma ion o subp oduc s and/
o minimising hei en i onmen al and economic impac .
Un o una ely, enhancemen o selec i i y is ypically achie ed a
he expense o o e all ac i i y [45]. High ca alys selec i i y is achie ed
by applying s a egies o coupling, decoupling o con inemen o
adso p ion si es and ac i e si es o une he di usion ba ie and ac i-
a ion ene gy ba ie in di e en ou es. Fo ins ance, undesi able si es
on he su ace o he e ogeneous ca alys s a e o en blocked ia
p e- ea men s wi h speci ic chemicals. This is he case o hyd oca bon
e o ming ca alys s, which a e exposed o small amoun s o H
2
S be o e
in oducing he c ude oil eeds. Sulphu selec i ely blocks he su ace
si es o hyd oca bon hyd ogenolysis, a ec ing hose o skele al isom-
e iza ion o a much lesse ex en [46]. Ano he example is he hyd o-
genolysis o glyce ol o 1,2 – p opanodiol (1,2 – PDO) [47]. Ru/C
ca alys s a e poo ly selec i e owa ds he a ge 1,2 – PDO achie ing a
12% selec i i y whe eas he main p oduc ob ained is e hylene glycol.
Howe e , when he same ca alys is sul ona ed (Ru-S/C) he selec i i y
o 1,2 – PDO g ea ly inc eases o 79%. A simila s a egy has been e-
po ed o he selec i e hyd ogena ion o benzene o cyclohexene o e
Ru-Zn ca alys s as a syn he ic ou e o ob ain nylon. A c i ical s ep in his
eac ion is he undesi ed o ma ion o cyclohexane which is a mo e
s able p oduc han cyclohexene. Hyd ophilic modi ica ion o he
Ru-based ca alys is he mos e ec i e way o imp o e cyclohexene
selec i i y [48]. The s agnan wa e laye o med o e he ca alys
suppo is en iched in benzene whe eas cyclohexene ( he i s hyd o-
gena ion p oduc ) quickly deso bs om i . This p ocess enables he
u he p og ess o his eac ion and a oids addi ional hyd ogena ion o
cyclohexene o cyclohexane since he di usion g adien d i es he
mig a ion o he o me in o he aqueous phase.
2.11. Open da a and a i icial in elligence
Sha ing ca aly ic da a and manu ac u ing echniques oge he wi h a i-
icial in elligence (AI) may boos o new sus ainable ca alys s and
applica ions.
The a ailabili y o ca aly ic open da a om design, cha ac e isa ion,
ope a ional a iables (p essu e, empe a u e, low a e, e c.), pe o -
mance KPIs (e.g. con e sion, selec i i y, e c.) and kine ics will help in
he imp o emen and design o u u e ca alys s and ca aly ic p ocesses.
The use o a i icial in elligence elies on he a ailabili y o enough da a
and high-quali y da a.
A numbe o da abases a e now a ailable ela ed o ma e ial p op-
e ies, c ys al s uc u es, ino ganic ma e ials, su ace eac ion ene ge ics
and DFT calcula ions, 2D ma e ials, chemical eac ions on ca aly ic
su aces and o he s [49]. T aining a p ope ML algo i hm wi h such da a
ins an ly (e.g. 788 eac ion da a se ), ac i a ion ene gies can be es i-
ma ed wi h 90% accu acy almos [50].
One ecen example can be ound in he web-based ca aly ic pla o m
Ca alys Acquisi ion by Da a Science (CADS) p o iding managemen and
analysis o da a and p edic ion o p ope ies [51].
2.12. Ope ando and in-si u acking
Measu ing he eal ins an aneous pe o mance o he ca alys a ele an
eac ion condi ions will enable a be e op imisa ion o he ca alys s, hei
p ocesses, and be e u u e designs.
The knowledge o s uc u al cha ac e is ics o he ca alys , e.g. su -
ace s uc u e, and he main kine ic pe o mance pa ame e s in e ms o
con e sion, eac i i y, selec i i y and yield a e key o a good ca alys
design.
In si u cha ac e isa ion has been ca ied ou du ing he las 60–70
yea s and p o ides aluable in o ma ion o he ca alys in i s wo king
place, bu unde a con olled a mosphe e. Ope ando goes a beyond,
measu ing simul aneously he ca alys cha ac e is ics and he p oduc
scheme. Unde such app oach he ca alys s uc u e is obse ed unde
eal o almos - eal condi ions o p essu e, empe a u e, low, eagen
concen a ions, e c. which enables he connec ion be ween s uc u e
and pe o mance o a highe le el. Almos any ype o ca alys can be
analysed using ope ando, suppo ed o unsuppo ed, me al o me al
oxides and o many ypes, such as mesopo ous silica, zeoli es, poly-
oxome ala es, bulk mixed oxides, sulphides o e en so ben s in a as
numbe o eac ion applica ions [52].
Ope ando is di icul o mas e . Acco ding o he da a ob ained om
a Scopus da abase sea ch (i.e. “in si u+ca alysis” s. “ope -
ando+ca alysis” o “in si u spec oscopy +ca alysis” s. “ope ando
spec oscopy +ca a alysis”) yea a e yea mo e g oups a ound he
wo ld a e joining in, wi h chemis y (34%), chemical enginee ing (27%)
and ma e ials science (11%) being he a eas ha use i he mos . A he
same ime, in si u analysis con inues o g ow and p o ide aluable in-
o ma ion. Conside ing scien i ic publica ions, "in si u" is s ill be ween 4
and 9 imes highe in olume han "ope ando" in 2020 depending on
whe he he wo d "spec oscopy" is added o he sea ch. The in si u
echnique is mo e widely used, as i is unde s andable ha no all g oups
in ol ed in ca alys cha ac e isa ion s udy he kine ics and speci ic e-
ac ions in such de ail.
The cu en man-made clima e change is s ongly ela ed o human
ac i i ies and in pa icula o CO
2
emissions. Majo R&D e o s a e
being made in CO
2
cap u e in se e al ways. Chemical CO
2
cap u e can
be achie ed by non- educing s a egies (ca bona es, u eas, ca bama es,
ca boxylic acids, e c.) and by educ i e s a egies (H
2
, CO, me hanol,
o mic acid, e c.) [53]. Reduc i e s a egies a e complica ed, as hey
equi e la ge amoun s o ene gy and/o mo e d as ic condi ions, so he
oom o imp o emen is la ge. As an example, Yang e al. demons a ed
he e ec i eness o single-a om he e ogeneous ca alysis in elec o-
chemical CO
2
educ ion [54]. They iden i ied he ca aly ic ac i i y o
single-Ni-a om, i.e. mono alen Ni(I), o he CO
2
educ ion using
ope ando X- ay abso p ion and pho oelec on spec oscopy. Ope ando
analysis allows a be e unde s anding o he p inciples o ca alysis and
hus he possibili y o be e ca alys design. Cheng e al. ca ied ou a
simila esea ch based on he deposi ion o he single-a om-Ni and o he
me als on ni ogen-doped ca bon nano ubes [55].
In many cases, he e ms in si u and ope ando a e used in e -
changeably, as G ey and Ta ascon poin ed ou [56]. They p esen a
comp ehensi e analysis o in si u/ope a ing echniques used in elec-
ochemis y o he design and analysis o mo e sus ainable ba e ies. In
pa icula , how o imp o e cha ge and discha ge cycles. Reducing he
amoun o ac i e me al equi ed o imp o ing he numbe o cycles a e
clea examples.
J. Ga cía-Se na e al.
Ca alysis Today xxx (xxxx) xxx
6
3. Conclusions
The wo ld is accele a ing and mo e and mo e p oduc s a e being
used e e y day. Chemis y and chemical enginee ing a e a he basis o
he c ea ion and p oduc ion o hese p oduc s ha con ibu e o he
wel a e socie y. Ce ainly, ca alysis is one o he echnologies ha can
d i e he de elopmen and c ea ion o new p oduc s. A he a omic-
molecula le el, ca alysis is able o educe he ene gy ba ie and e en
elimina e i , making he mi acle possible.
We ha e analyzed he bes and mos inno a i e p ac ices in ca alys
design conside ing sus ainable chemis y, wi h he basis on he p inci-
ples o g een chemis y and g een enginee ing. As a esul o ha we
ha e compiled 12 basic p inciples ha may inspi e he imp o emen o
c ea ion o new ca alys s conside ing he ac i e me als, he p oduc s
c ea ed and enewable esou ces used, scalabili y, s abili y, as -
induc ion and ci cula i y. We also ocus on compu e science o
possible in silico design and e e y hing ela ed o da a and a i icial
in elligence. Impo ance is gi en o biomimic y, ge ing inspi a ion om
na u e’s designs and ope ando echniques o un eil he eal ca alys in
ac ion. Finally, he pu pose o all his should be based on g and chal-
lenges such as he Sus ainable De elopmen Goals.
We can ce ainly say ha ca alysis is an exponen ial echnology
( ollowing Pe e Diamandis’ hinking). Ma hema ically, because i is
based on A henius’ law, bu p ac ically because i a ec s mo e han a
billion people e e y day.
CRediT au ho ship con ibu ion s a emen
Juan Ga cía-Se na: Concep ualiza ion, Me hodology, Visualiza ion
(g aphical abs ac ), W i ing – o iginal d a , W i ing – e iew & edi ing
and Supe ision. Raúl Pi˜
ne o-He nanz: W i ing – o iginal d a ,
W i ing – e iew & edi ing. Desi ´
ee Du ´
an-Ma ín: W i ing – o iginal
d a , W i ing – e iew & edi ing.
Decla a ion o Compe ing In e es
The au ho s decla e ha hey ha e no known compe ing inancial
in e es s o pe sonal ela ionships ha could ha e appea ed o in luence
he wo k epo ed in his pape .
Acknowledgemen s
D . Juan Ga cía-Se na hanks he Agencia Es a al de In es igaci´
on
and FEDER Funds EU o unding p ojec e e ence PID2019-105975GB-
I00 (MICINN/FEDER, EU), and Jun a de Cas illa y Le´
on - Conseje ía de
Educaci´
on and FEDER Funds p ojec e e ence CLU-2019-04.
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