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Tuning sno_2 surface with cuo for soot particulate combustion: The effect of monolayer dispersion capacity on reaction performance

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Chinese Journal of Catalysis 2019年第6期40卷 905-916页

作者： Jiating Shen Xiaohui Feng Rui Liu Xianglan Xu Cheng Rao Jianjun Liu Xiuzhong Fang Chao Tan Youchang Xie Xiang Wang Key Laboratory of Jiangxi Province for Environment and Energy Catalysis College of ChemistryNanchang UniversityNanchang 330031JiangxiChina Jiangxi Baoan New Material Technology Corporation LTDPingxiang 337000JiangxiChina Key Laboratory of Process Analysis and Control of Sichuan Universities Yibin UniversityYibin 644000SichuanChina College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

With the objective to investigate the structure-reactivity relationship of cuo/sno2 and eventually design more applicable catalysts for soot combustion,catalysts with different cuo loadings have been prepared by impregnation *** using X-ray diffraction and X-ray photoelectron spectroscopy extrapolation methods,it is disclosed that cuo disperses finely on the sno2 support to form a monolayer with a capacity of 2.09 mmol 100 m^-2,which equals 4.8 wt%cuo *** the cuo loading is below the capacity,it is in a sub-monolayer ***,when the loading is above the capacity,cuo micro-crystallites will be formed that coexist with the cuo *** soot combustion activity of the catalyst increases with the cuo loading until it reaches the monolayer dispersion capacity.A further increase in the cuo loading has no evident influence on the *** results have testified that with the addition of cuo onto the sno2 support,a surface-active oxygen species can be formed,the amount of which also increases significantly with the increase in the cuo loading until it reaches the monolayer dispersion *** the cuo loading further has no evident impact on the amount of surface ***,an apparent monolayer dispersion threshold effect is observed for soot combustion over cuo/sno2 *** is concluded that the amount of surface-active oxygen sites is the major factor determining the activity of the catalyst.

关键词： cuo supported on sno2 Soot particulate combustion Monolayer dispersion X-ray diffraction and X-ray photoelectron spectroscopy extrapolation Threshold effect

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