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

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

doi:10.1016/j.apcatb.2019.117807

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

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

Chemical Sciences Division

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

Abstract

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.

Original language	English
Article number	117807
Journal	Applied Catalysis B: Environmental
Volume	256
DOIs	https://doi.org/10.1016/j.apcatb.2019.117807
State	Published - Nov 5 2019

Funding

This work was supported by the National Key R&D Program of China (2016YFC0205900), the National Natural Science Foundation of China (21503106, 21566022 and 21773106), and the Natural Science Foundation of Jiangxi Province (20171BCB23016, 20171BAB203024 and 20181BCD4004), and the Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (Grant No. 2018-K04). P. F. Z. acknowledges Shanghai Pujiang Program (Grant No.17PJ1403500), Thousand Talent Program, National Natural Science Foundation of China (Grant No. 21776174), and the Open Foundation of the State Key Laboratory of Ocean Engineering (Shanghai Jiao Tong University of China) (No. 1809) for the support. S. D. was supported by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, US Department of Energy.

Funders	Funder number
National Natural Science Foundation of China	21776174, 21566022, 21773106, 21503106
Natural Science Foundation of Jiangxi Province	20171BCB23016, 20171BAB203024, 20181BCD4004
National Basic Research Program of China (973 Program)	2016YFC0205900

Keywords

Ceria nanowires
Core-shell catalysts
Mesoporous materials
Self-assembly
VOCs combustion

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10.1016/j.apcatb.2019.117807

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

abstract = "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.",

keywords = "Ceria nanowires, Core-shell catalysts, Mesoporous materials, Self-assembly, VOCs combustion",

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

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year = "2019",

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doi = "10.1016/j.apcatb.2019.117807",

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T1 - Active and stable Pt-Ceria nanowires@silica shell catalyst

T2 - Design, formation mechanism and total oxidation of CO and toluene

AU - Peng, Honggen

AU - Dong, Tao

AU - Zhang, Li

AU - Wang, Caili

AU - Liu, Wenming

AU - Bao, Jiafeng

AU - Wang, Xiang

AU - Zhang, Ning

AU - Wang, Zheng

AU - Wu, Peng

AU - Zhang, Pengfei

AU - Dai, Sheng

PY - 2019/11/5

Y1 - 2019/11/5

N2 - 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.

AB - 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.

KW - Ceria nanowires

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KW - Mesoporous materials

KW - Self-assembly

KW - VOCs combustion

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

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