Highly efficient Pt catalyst on newly designed CeO2-ZrO2-Al2O3 support for catalytic removal of pollutants from vehicle exhaust

Tan, Wei; Xie, Shaohua; Wang, Xin; Wang, Chunying; Li, Yaobin; Shaw, Thomas E.; Ma, Lu; Ehrlich, Steven N.; Liu, Annai; Ji, Jiawei; Gao, Fei; Dong, Lin; Liu, Fudong

doi:10.1016/j.cej.2021.131855

Highly efficient Pt catalyst on newly designed CeO₂-ZrO₂-Al₂O₃ support for catalytic removal of pollutants from vehicle exhaust

Journal Article · Wed Aug 18 00:00:00 EDT 2021 · Chemical Engineering Journal

DOI:https://doi.org/10.1016/j.cej.2021.131855· OSTI ID:1830195

^[1]; Xie, Shaohua ^[2]; ^[3]; Wang, Chunying ^[4]; Li, Yaobin ^[4]; ^[2]; Ma, Lu ^[5]; Ehrlich, Steven N. ^[5]; ^[3]; ^[3]; ^[3]; Dong, Lin ^[3]; Liu, Fudong ^[2]

Nanjing Univ. (China); 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)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Pt-CeO₂ catalysts have been widely studied for the vehicle emission control. Designing novel CeO₂ based supports with improved physical-chemical properties has become a research hotspot to further promote the catalytic performance and stability of Pt-CeO₂ catalysts. In this work, through utilizing a unique, two-step incipient wetness impregnation (T-IWI) method for ceria-zirconia-alumina (CZA-T) support preparation, a Pt single site catalyst (Pt/CZA-T) with excellent thermal stability was synthesized. Higher oxidation activity and Oxygen storage capacity (OSC) were achieved on activated Pt/CZA-T, comparing to Pt catalysts on regular CeO₂/Al₂O₃ (Pt/CA) and one-step prepared CeZrO_x/Al₂O₃ (Pt/CZA). Via the modification of hydrophilic/hydrophobic properties of γ-Al₂O₃ by this unique T-IWI method, finer Ce_0.9Zr_0.1O₂ particles with higher density of surface defects were formed on CZA-T, on which a higher Pt dispersion and stronger Pt-O-Ce interaction were achieved. Upon activation, smaller, well-dispersed Pt clusters on CZA-T were generated. It was concluded that the CO oxidation performance and OSC were highly related to the size of Pt clusters on different supports that we have developed. Finally, more Pt sites located at Pt cluster-CeZrO_x interfaces, which were the real active sites, were responsible for the highest OSC function and CO oxidation activity of activated Pt/CZA-T catalyst.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); Natural Science Foundation of Jiangsu Province; USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0012704

OSTI ID:: 1830195

Alternate ID(s):: OSTI ID: 1868746

Report Number(s):: BNL--222363-2021-JAAM

Journal Information:: Chemical Engineering Journal, Journal Name: Chemical Engineering Journal Vol. 426; ISSN 1385-8947

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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CO oxidation
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Highly efficient Pt catalyst on newly designed CeO2-ZrO2-Al2O3 support for catalytic removal of pollutants from vehicle exhaust

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