Active and stable Pt-Ceria nanowires@silica shell catalyst: Design, formation mechanism and total oxidation of CO and toluene

Peng, Honggen; Dong, Tao; Zhang, Li; Wang, Caili; Liu, Wenming; Bao, Jiafeng; Wang, Xiang; Zhang, Ning; Wang, Zheng; Wu, Peng; Zhang, Pengfei; Dai, Sheng

doi:10.1016/j.apcatb.2019.117807

Title: Active and stable Pt-Ceria nanowires@silica shell catalyst: Design, formation mechanism and total oxidation of CO and toluene

Journal Article · Tue Jun 04 00:00:00 EDT 2019 · Applied Catalysis B: Environmental

DOI:https://doi.org/10.1016/j.apcatb.2019.117807· OSTI ID:1783031

^[1]; Dong, Tao ^[2]; Zhang, Li ^[2]; Wang, Caili ^[2]; Liu, Wenming ^[2]; Bao, Jiafeng ^[3]; Wang, Xiang ^[2];

^[2]; Wang, Zheng ^[4]; Wu, Peng ^[5];

^[3]; Dai, Sheng ^[6]

Nanchang Univ. (China). College of Chemistry, Key Laboratory of Jiangxi Province for Environment and Energy Catalysis; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Div.
Nanchang Univ. (China). College of Chemistry, Key Laboratory of Jiangxi Province for Environment and Energy Catalysis
Shanghai Jiao Tong Univ. (China). School of Chemistry and Chemical Engineering
Ningxia Univ., Yinchuan (China). State Key Laboratory of High-efficiency Utilization of Coal & Green Chemical Engineering
East China Normal Univ. (ECNU), Shanghai (China). Dept. of Chemistry and Molecular Engineering, Shanghai Key Laboratory of Green Chemistry and Chemical Processes
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Div.; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry

Cerium oxide is one of the most important rare earth metal oxides in catalysis, however, the sintering problem of noble metals and CeO₂ at higher temperature (e.g., >700 °C) is still unresolved. Herein, Pt nanoparticles self-assembled on ultra-thin CeO₂ nanowires (NWs) and then confined inside a thermally robust porous silica shell (Pt-CeO2NW@SiO₂) were introduced. The thickness of CeO₂ NWs was just ~2.0 nm. Moreover, Pt-CeO₂ NW@SiO₂ showed significantly enhanced catalytic performances for total oxidation of CO and toluene. The increased catalytic properties are attributed to the strong metal-support interaction effect between Pt and CeO₂ NWs at sub-nanoscale. Most importantly, the special core-shell structure also affords excellent sintering resistance retention up to 700 °C for 100 h, due to the guarding effect of porous silica shell. Finally, the formation mechanism of Pt-CeO₂ NW@SiO₂ was investigated in detail. Current strategy should inspire many rational designs of rare-earth metal-based nanocatalysts for real-world catalysts.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC05-00OR22725; 2016YFC0205900; 21503106; 21566022; 21773106

OSTI ID:: 1783031

Journal Information:: Applied Catalysis B: Environmental, Vol. 256, Issue n/a; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Active and stable Pt-Ceria nanowires@silica shell catalyst: Design, formation mechanism and total oxidation of CO and toluene

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