过渡金属掺杂锡基氧化物固溶体催化碳烟燃烧

doi:10.11896/cldb.21030095

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Abstract Aseries of SnO₂-based solid solutions TM-SnO₂ (TM=Mn, Fe, Co, Ni) with mesoporous structures were prepared by CTAB-assisted coprecipitation method for catalytic combustion of diesel soot particulates. The solid solutions were characterized by XRD, SEM, N₂ adsorption-desorption, Raman spectrum, H₂-TPR and FTIR technologies. Their catalytic activity for soot combustion was investigated by temperature programmed oxidation. Doping the SnO₂ with small amounts of transition metals could form a stable solid solution with rutile structure. After calcination at 800 ℃ for 6 h, the SnO₂-based solid solutions displayed nanospheres with diameter of 20—30 nm and relatively large surface areas of 20—40 m²·g^-1, while transition metal doping increased the pore size. A strong interaction between Sn and transition metals occurred in the solid solution, improving the mobility of the surface oxygen and redox properties. The improved oxygen mobility might be derived from the structure defects induced by transition metals doping, which could be helpful in oxidation reactions. In comparison with uncatalyzed reactions, the SnO₂ catalyst exhibited moderate catalytic activity for soot combustion, while the SnO₂-based solid solutions doped with transition metals displayed enhanced activity and selectivity, together with increased soot combustion rates. The improved catalytic performance may be related to their enhanced the reducibility, increased surface oxygen vacancies and improved pore structure. The MnSn catalyst possessed the highest performance with the ignition temperature (T₁₀) of 320 ℃, the semi-conversion temperature (T₅₀) of 375 ℃, and the selectivity to CO₂ formation of above 96%. Furthermore, the presence of NO in the reaction atmosphere promoted soot combustion over SnO₂-based solid solutions, which follows the NO₂-assisted mechanism.

Key words： tin dioxide solid solution transition metal soot particulates catalytic oxidation

Published: Online: 2022-06-09

CLC number:

O643

Fund:National Natural Science Foundation of China (21777055) and Key R & D Program of Shandong Province (2019GSF109116).

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	Articles by authors
	WANG Baoqin
	WANG Ben
	LENG Yuning
	WANG Zhongpeng
	LI Huafang
	SHENG Hui
	LIU Wei
	WANG Liguo

Cite this article:

WANG Baoqin,WANG Ben,LENG Yuning, et al. Soot Combustion Catalyzed by Transition Metal Doped Tin-based Oxide Solid Solution[J]. Materials Reports, 2022, 36(11): 21030095-6.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.21030095 OR http://www.mater-rep.com/EN/Y2022/V36/I11/21030095

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