Citation: Jiating Shen, Xiaohui Feng, Rui Liu, Xianglan Xu, Cheng Rao, Jianjun Liu, Xiuzhong Fang, Chao Tan, Youchang Xie, Xiang Wang. Tuning SnO₂ surface with CuO for soot particulate combustion:The effect of monolayer dispersion capacity on reaction performance[J]. Chinese Journal of Catalysis, ;2019, 40(6): 905-916. doi: S1872-2067(19)63354-1 shu

Tuning SnO₂ surface with CuO for soot particulate combustion:The effect of monolayer dispersion capacity on reaction performance

a Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, Nanchang 330031, Jiangxi, China;
b Jiangxi Baoan New Material Technology Corporation, LTD, Pingxiang 337000, Jiangxi, China;
c Key Laboratory of Process Analysis and Control of Sichuan Universities, Yibin University, Yibin 644000, Sichuan, China;
d College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Received Date: 29 January 2019
Revised Date: 12 March 2019

Fund Project: This work is supported by the National Natural Science Foundation of China (21567016, 21666020), the Natural Science Foundation of Jiangxi Province (20181ACB20005, 20171BAB213013, 20181BCD40004, 20181BAB203017), the Innovation Fund Designated for Graduate Students of Jiangxi Province (YC2018-B015), the Education Department Foundation of Jiangxi Province (KJLD14005), and the Opening Fund of Key Laboratory of Process Analysis and Control of Sichuan Universities (2017002), which are greatly acknowledged by the authors.

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 method. By 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 loading. When the CuO loading is below the capacity, it is in a sub-monolayer state. However, when the loading is above the capacity, CuO micro-crystallites will be formed that coexist with the CuO monolayer. The 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 activity. Raman 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 capacity. Increasing the CuO loading further has no evident impact on the amount of surface oxygen. Therefore, an apparent monolayer dispersion threshold effect is observed for soot combustion over CuO/SnO₂ catalysts. It is concluded that the amount of surface-active oxygen sites is the major factor determining the activity of the catalyst.
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Tuning SnO₂ surface with CuO for soot particulate combustion:The effect of monolayer dispersion capacity on reaction performance