Structure-activity relationship of Pt catalyst on engineered ceria-alumina support for CO oxidation

Xie, Shaohua; Tan, Wei; Wang, Chunying; Arandiyan, Hamidreza; Garbrecht, Magnus; Ma, Lu; Ehrlich, Steven N.; Xu, Peng; Li, Yaobin; Zhang, Yan; Collier, Samantha; Deng, Jiguang; Liu, Fudong

doi:10.1016/j.jcat.2021.12.002

Structure-activity relationship of Pt catalyst on engineered ceria-alumina support for CO oxidation

Journal Article · Thu Dec 09 04:00:00 EST 2021 · Journal of Catalysis

DOI:https://doi.org/10.1016/j.jcat.2021.12.002· OSTI ID:1836797

Xie, Shaohua ^[1]; Tan, Wei ^[2]; Wang, Chunying ^[3]; ^[4]; ^[4]; Ma, Lu ^[5]; Ehrlich, Steven N. ^[5]; Xu, Peng ^[6]; Li, Yaobin ^[3]; Zhang, Yan ^[3]; ^[1]; Deng, Jiguang ^[7]; ^[1]

Univ. of Central Florida, Orlando, FL (United States)
Univ. of Central Florida, Orlando, FL (United States); Nanjing Univ. (China)
Chinese Academy of Sciences (CAS), Xiamen (China)
Univ. of Sydney, NSW (Australia)
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Chinese Academy of Sciences (CAS), Beijing (China)
Beijing University of Technology (China)

In heterogeneous catalysis, the promotion of low temperature activity and enhancement of thermal stability simultaneously especially for precious metal catalysts is always highly demanded but very challenging. In this work, we report a novel Pt catalyst on ceria-alumina (CeO₂/Al₂O₃) support (Pt/CA-T) engineered by a two-step ceria deposition strategy, exhibiting superior thermal stability and low-temperature carbon monoxide (CO) oxidation activity after activation. Pt single sites anchored to engineered CeO₂ edge sites are much more stable than that to CeO₂ (111) surface, and such stable single sites can be transformed into highly active Pt clusters for efficient low-temperature CO oxidation. Active site identification indicates that the CO oxidation activity of different Pt sites follows such sequence: Pt cluster step sites ≈ Pt cluster terrace sites > Pt cluster corner sites $$\gg$$ Pt single sites on CeO₂. The excellent low temperature activity of activated Pt/CA-T catalyst for CO oxidation is associated with its abundant Pt cluster step and terrace sites as well as rich Pt-CeO₂ interfaces, which facilitate the adsorption of active CO species and superior oxygen activation/transfer ability. The present study provides new insights into the structure–activity relationship of Pt-CeO₂-Al₂O₃ catalyst, which can also guide the preparation of other highly robust supported catalysts for important industrial applications.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0012704

OSTI ID:: 1836797

Alternate ID(s):: OSTI ID: 1862563

Report Number(s):: BNL--222478-2021-JAAM

Journal Information:: Journal of Catalysis, Journal Name: Journal of Catalysis Vol. 405; ISSN 0021-9517

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Active sites
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Structure-activity relationship of Pt catalyst on engineered ceria-alumina support for CO oxidation

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