Citation: Cheng Rao, Rui Liu, Xiaohui Feng, Jiating Shen, Honggen Peng, Xianglan Xu, Xiuzhong Fang, Jianjun Liu, Xiang Wang. Three-dimensionally ordered macroporous SnO₂-based solid solution catalysts for effective soot oxidation[J]. Chinese Journal of Catalysis, ;2018, 39(10): 1683-1694. doi: 10.1016/S1872-2067(18)63123-7 shu

Three-dimensionally ordered macroporous SnO₂-based solid solution catalysts for effective soot oxidation

a Institute of Applied Chemistry, College of Chemistry, Nanchang University, Nanchang 330031, Jiangxi, China;
b Jiangxi Baoan New Material Technology Corporation, Ltd, Pingxiang 337000, Jiangxi, China

Received Date: 28 April 2018
Revised Date: 28 May 2018

Fund Project: This work was supported by the Natural Science Foundation of China (21567016, 21503106), the Natural Science Foundation of Jiangxi Province (20171BAB213013), the Education Department Foundation of Jiangxi Province (KJLD14005), National Key Research and Development Program of China (2016YFC0209302), the Innovation Fund Designated for Graduate Students of Jiangxi Province (YC2015-B017) and the Innovation Fund Designated for Undergraduate Students of China (201701035)

A series of three-dimensionally ordered macroporous (3DOM) SnO₂-based catalysts modified by the cations Ce⁴⁺, Mn³⁺, and Cu²⁺ have been prepared by using a colloidal crystal templating method and tested for soot combustion under loose contact condition. XRD and STEM mapping results confirm that all the secondary metal cations have entered the lattice matrix of tetragonal rutile SnO₂ to form non-continuous solid solutions, thus impeding crystallization and improving the surface areas and pore volumes of the modified catalysts. In comparison with regular SnO₂ nanoparticles, the 3DOM SnO₂ displays evidently improved activity, testifying that the formation of the 3DOM structure can anchor the soot particulates in the macro-pores, which ensures that the contact of the soot particles with the active sites on the 3DOM skeleton is more easily formed, thus benefiting the target reaction. With the incorporation of the secondary metal cations, the activity of the catalyst can be further improved due to the formation of more abundant mobile oxygen species. In summary, these effects are believed to be the major factors responsible for the activity of the catalyst.
- Three-dimensionally ordered macroporous catalyst,
- Soot combustion,
- SnO₂solid solution,
- Lattice doping,
- Oxygen vacancies
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Three-dimensionally ordered macroporous SnO₂-based solid solution catalysts for effective soot oxidation