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Engineering Catalyst Interfaces for Carbon Dioxide Utilization
Engineering Catalyst Interfaces for Carbon Dioxide Utilization
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103138
- ISBN
- 9798311963541
- DDC
- 600
- 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
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202103138
■006m o d
■007cr#unu||||||||
■020 ▼a9798311963541
■035 ▼a(MiAaPQ)AAI31974668
■035 ▼a(MiAaPQ)Stanfordvv425tq1293
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a600
■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.


