期刊
NANO RESEARCH
卷 15, 期 8, 页码 7042-7051出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-4360-0
关键词
hollow spheres; multi-interfaces; toluene combustion; active lattice oxygen
类别
资金
- National Natural Science Foundation of China [22076192, 22006032, 21777166, 42175133, 21806169]
- Beijing National Laboratory for Molecular Sciences [BNLMS-CXXM-202011]
- National Key Research and Development Program of China [2016YFCO202202]
This study reports the construction of shell-sandwiched MnO2-Ag-CeO2 hollow spheres with remarkable sintering resistance and high activity for toluene combustion. The unique hollow structure alters the electronic states of catalysts sites and increases the adsorbed site of reactant molecules. The multi-interfaces facilitate the release of oxygen species and the deep oxidation of intermediates.
Supported noble metal catalysts have the promising application in volatile organic compounds (VOCs) catalytic combustion but suffer from the deactivation due to noble metal sintering at high temperatures. Herein, we report the construction of shell-sandwiched MnO2-Ag-CeO2 hollow spheres with remarkable sintering resistance and high activity in toluene combustion. Ag clusters were sandwiched between outer MnO2 and inner CeO2 shell to enlarge and stabilize metal-support active interface. The unique hollow structure could alter the electronic states of catalysts sites and increase the adsorbed site of reactant molecules. Meanwhile, Mn-Ag-Ce multi-interfaces in MnO2-Ag-CeO2 could facilitate the sustainable activation and the stable release of oxygen species via a tandem transfer. The oxygen species at Ag-Mn interface perimeter were instantly replenished by Ag-Ce interface to accelerate a deep oxidation of intermediates, guaranteeing the opening of benzene ring to generate maleic anhydride. This investigation provides a promising method for constructing efficient and sintering-resistant cluster catalysts for VOCs oxidation.
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