期刊
ENVIRONMENTAL SCIENCE-NANO
卷 8, 期 8, 页码 2386-2395出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1en00339a
关键词
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资金
- National Key Research and Development Program [2017YFC0210903]
- National Natural Science Foundation of China [21306089]
- State Key Laboratory of Materials-Oriented Chemical Engineering [ZK201610, ZK201703]
- Qing-Lan Project of Jiangsu Province [2019M651820]
Perovskite oxides prepared by plasma-induced strategy with enhanced lattice distortion show excellent low temperature CH4 oxidation activities, providing a novel and universal strategy for the synthesis of composite oxide catalysts with rich surface defects.
Perovskite oxides have been considered as appropriate alternatives to precious metal catalysts in CH4 combustion due to their excellent activity and sintering-resistance capacity. Herein, an innovative plasma-induced strategy was employed to the one-step preparation of porous LaMnO3 (LMO-P) and cerium-substituted LaMnO3 (LCMO-P) perovskite oxides with enhanced lattice distortion. The increased specific surface area provided numerous active sites for surface diffusion, and formational lattice distortion introduced more active oxygen species. Exceptionally, the defect-enriched porous LMO-P and LCMO-P catalysts displayed supreme low temperature CH4 oxidation activities, giving T-90 of 475 degrees C and 440 degrees C at a space velocity of 30 000 mL g(-1) h(-1), respectively. The excellent catalytic activities of plasma-induced perovskite catalysts might be associated with high reactivity of oxygen adspecies as well as preferable reducibility. This study will provide a novel and universal strategy for the synthesis of composite oxide catalysts with rich surface defects.
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