Investigating the impact of dynamic structural changes of Au/rutile catalysts on the catalytic activity of CO oxidation

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Authors
Hu, X 
Fan, Q 
Tan, M 
Luo, Y 
Wu, X 
Abstract

jats:titleAbstract</jats:title>jats:pThe surface properties of oxidic supports and their interaction with the supported metals play critical roles in governing the catalytic activities of oxide‐supported metal catalysts. When metals are supported on reducible oxides, dynamic surface reconstruction phenomena, including strong metal–support interaction (SMSI) and oxygen vacancy formation, complicate the determination of the structural–functional relationship at the active sites. Here, we performed a systematic investigation of the dynamic behavior of Au nanocatalysts supported on flame‐synthesized TiOjats:sub2</jats:sub>, which takes predominantly a rutile phase, using CO oxidation above room temperature as a probe reaction. Our analysis conclusively elucidated a negative correlation between the catalytic activity of Au/TiOjats:sub2</jats:sub> and the oxygen vacancy at the Au/TiOjats:sub2</jats:sub> interface. Although the reversible formation and retracting of SMSI overlayers have been ubiquitously observed on Au/TiOjats:sub2</jats:sub> samples, the catalytic consequence of SMSI remains inconclusive. Density functional theory suggests that the electron transfer from TiOjats:sub2</jats:sub> to Au is correlated to the presence of the interfacial oxygen vacancies, retarding the catalytic activation of CO oxidation.</jats:p>

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Funder: China Scholarship Council (CSC)

Keywords
CO oxidation, electronic metal-support interactions, flame-synthesis, metal-support interactions, oxygen vacancy, strong metal-support interaction
Journal Title
Carbon Energy
Conference Name
Journal ISSN
2637-9368
2637-9368
Volume Title
Publisher
Wiley
Sponsorship
Science and Technology Innovation Program of Hunan Province (2020GK2070, 2021RC4006)
Innovation‐Driven Project of Central South University (2020CX008)
National Key R&D Program of China (2022YFE0105900)
National Natural Science Foundation of China (52276093)
National Research Foundation Singapore (CREATE)