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Engineering Catalyst Interfaces for Carbon Dioxide Utilization
Engineering Catalyst Interfaces for Carbon Dioxide Utilization
Engineering Catalyst Interfaces for Carbon Dioxide Utilization

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자료유형  
 학위논문 서양
최종처리일시  
20260202103138
ISBN  
9798311963541
DDC  
600
저자명  
Zhou, Chengshuang.
서명/저자  
Engineering Catalyst Interfaces for Carbon Dioxide Utilization
발행사항  
[Sl] : Stanford University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
241 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Cargnello, Matteo.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2024.
초록/해제  
요약The reduction of anthropogenic CO2 requires combined efforts in multiple areas, including reduction in CO2emissions, capture of atmospheric CO2, and the storage or utilization of captured CO2. CO2 hydrogenation provides the unique opportunity of valorizing this greenhouse gas to a variety of chemicals, which contributes to a sustainable future where renewable energy is used to produce important chemicals and decrease the carbon footprint. The hydrogenation of CO2, however, yields a wide range of chemicals, and the selectivity towards a specific product relies in first place on the heterogeneous catalysts used to accelerate the rate of the reactions, whose properties are further dictated by their structure.Conventional heterogeneous catalysts consist of multiple elements in their metal and/or oxide form supported on oxide materials, and the interface between the metal(s) and the supporting oxide has been identified as a crucial aspect in achieving reactivity and selectivity beyond what can be obtained with individual components. This dissertation focuses on three types of catalyst interfaces, and the impact of their structure on CO2 hydrogenation reactions.The first interface of interest in this dissertation is the Ru-In metal-metal interface. Few works have focused on this interface due to the immiscibility of these two elements. I found that when placed in proximity, thanks to colloidal methods for the preparation of Ru-In metal particles, there was unique affinity between Ru nanoparticles and adjacent In2O3 particles under reducing environments, such that In atoms preferentially decorated Ru particles. The interfaces between Ru and In enabled methanol productivity from CO2 hydrogenation which outperformed not only the individual constituents but also ordered RuIn3intermetallic alloys. The effect of In addition to Ru was mainly investigated with operando XAS and CO-DRIFTS characterizations.The second interface of interest is the Ru-In2O3 interface. Under strictly reducing conditions, reduced forms of In2O3 quickly migrated towards and encapsulated Ru, producing ethanol with high but transient selectivity. The continuous evolution of the Ru-In2O3 interface led to a decrease of ethanol production and eventually complete deactivation of the catalyst to favor instead the production of methanol. Efforts were then devoted to understanding the origin of catalyst deactivation as well as developing methods to stabilize the Ru-In2O3interfaces for ethanol production.I then explored the potential of using organic polymers as modifiers to modulate the catalytic performances of conventional inorganic catalysts. I have developed a versatile approach to encapsulate a variety of metal oxide substrates with imine- and amine-linked polymers with controllable thickness, porosity, and functionality. Specifically, I discovered that polymer encapsulation dramatically improved the production of higher hydrocarbons in Ru/TiO2 catalysts. By tuning polymer porosity and functionality independently, I was able to systematically investigate the effect of polymer modification. This approach of tuning active sites by polymer encapsulation has the potential to be applied to a wide range of heterogeneous catalysts, and the polymer functionality can be designed to interact with specific intermediates and guide novel reaction pathways in complex reaction networks.Overall, my PhD research focused on the fundamental understanding of structure-performance relationships for CO2 hydrogenation reactions at catalyst interfaces. This knowledge acquired during my PhD was utilized to design novel catalyst structures that achieved unprecedented activity and selectivity for CO2 hydrogenation towards valuable products.
일반주제명  
Polymers
일반주제명  
Intermetallic compounds
일반주제명  
Oxidation
일반주제명  
Hydrogenation
일반주제명  
Nanoparticles
일반주제명  
Carbon dioxide
일반주제명  
Adsorption
일반주제명  
Ethanol
일반주제명  
Alternative energy
일반주제명  
Chemical engineering
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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■1001  ▼aZhou,  Chengshuang.
■24510▼aEngineering  Catalyst  Interfaces  for  Carbon  Dioxide  Utilization
■260    ▼a[Sl]▼bStanford  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a241  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Cargnello,  Matteo.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2024.
■520    ▼aThe  reduction  of  anthropogenic  CO2  requires  combined  efforts  in  multiple  areas,  including  reduction  in  CO2emissions,  capture  of  atmospheric  CO2,  and  the  storage  or  utilization  of  captured  CO2.  CO2  hydrogenation  provides  the  unique  opportunity  of  valorizing  this  greenhouse  gas  to  a  variety  of  chemicals,  which  contributes  to  a  sustainable  future  where  renewable  energy  is  used  to  produce  important  chemicals  and  decrease  the  carbon  footprint.  The  hydrogenation  of  CO2,  however,  yields  a  wide  range  of  chemicals,  and  the  selectivity  towards  a  specific  product  relies  in  first  place  on  the  heterogeneous  catalysts  used  to  accelerate  the  rate  of  the  reactions,  whose  properties  are  further  dictated  by  their  structure.Conventional  heterogeneous  catalysts  consist  of  multiple  elements  in  their  metal  and/or  oxide  form  supported  on  oxide  materials,  and  the  interface  between  the  metal(s)  and  the  supporting  oxide  has  been  identified  as  a  crucial  aspect  in  achieving  reactivity  and  selectivity  beyond  what  can  be  obtained  with  individual  components.  This  dissertation  focuses  on  three  types  of  catalyst  interfaces,  and  the  impact  of  their  structure  on  CO2  hydrogenation  reactions.The  first  interface  of  interest  in  this  dissertation  is  the  Ru-In  metal-metal  interface.  Few  works  have  focused  on  this  interface  due  to  the  immiscibility  of  these  two  elements.  I  found  that  when  placed  in  proximity,  thanks  to  colloidal  methods  for  the  preparation  of  Ru-In  metal  particles,  there  was  unique  affinity  between  Ru  nanoparticles  and  adjacent  In2O3  particles  under  reducing  environments,  such  that  In  atoms  preferentially  decorated  Ru  particles.  The  interfaces  between  Ru  and  In  enabled  methanol  productivity  from  CO2  hydrogenation  which  outperformed  not  only  the  individual  constituents  but  also  ordered  RuIn3intermetallic  alloys.  The  effect  of  In  addition  to  Ru  was  mainly  investigated  with  operando  XAS  and  CO-DRIFTS  characterizations.The  second  interface  of  interest  is  the  Ru-In2O3  interface.  Under  strictly  reducing  conditions,  reduced  forms  of  In2O3  quickly  migrated  towards  and  encapsulated  Ru,  producing  ethanol  with  high  but  transient  selectivity.  The  continuous  evolution  of  the  Ru-In2O3  interface  led  to  a  decrease  of  ethanol  production  and  eventually  complete  deactivation  of  the  catalyst  to  favor  instead  the  production  of  methanol.  Efforts  were  then  devoted  to  understanding  the  origin  of  catalyst  deactivation  as  well  as  developing  methods  to  stabilize  the  Ru-In2O3interfaces  for  ethanol  production.I  then  explored  the  potential  of  using  organic  polymers  as  modifiers  to  modulate  the  catalytic  performances  of  conventional  inorganic  catalysts.  I  have  developed  a  versatile  approach  to  encapsulate  a  variety  of  metal  oxide  substrates  with  imine-  and  amine-linked  polymers  with  controllable  thickness,  porosity,  and  functionality.  Specifically,  I  discovered  that  polymer  encapsulation  dramatically  improved  the  production  of  higher  hydrocarbons  in  Ru/TiO2  catalysts.  By  tuning  polymer  porosity  and  functionality  independently,  I  was  able  to  systematically  investigate  the  effect  of  polymer  modification.  This  approach  of  tuning  active  sites  by  polymer  encapsulation  has  the  potential  to  be  applied  to  a  wide  range  of  heterogeneous  catalysts,  and  the  polymer  functionality  can  be  designed  to  interact  with  specific  intermediates  and  guide  novel  reaction  pathways  in  complex  reaction  networks.Overall,  my  PhD  research  focused  on  the  fundamental  understanding  of  structure-performance  relationships  for  CO2  hydrogenation  reactions  at  catalyst  interfaces.  This  knowledge  acquired  during  my  PhD  was  utilized  to  design  novel  catalyst  structures  that  achieved  unprecedented  activity  and  selectivity  for  CO2  hydrogenation  towards  valuable  products.
■590    ▼aSchool  code:  0212.
■650  4▼aPolymers
■650  4▼aIntermetallic  compounds
■650  4▼aOxidation
■650  4▼aHydrogenation
■650  4▼aNanoparticles
■650  4▼aCarbon  dioxide
■650  4▼aAdsorption
■650  4▼aEthanol
■650  4▼aAlternative  energy
■650  4▼aChemical  engineering
■690    ▼a0542
■690    ▼a0363
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357143▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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