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Chemcial Industry and Engineering 2019, Vol. 36 Issue (3) :1-7    DOI: 10.13353/j.issn.1004.9533.20171002
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Preparation, Characterization and Catalytic Performance of Mn/K2Ti8O17 Used for Soot Combustion
Zhai Yueyuan, Cao Chunmei, Xing Lingli, Yang Yuexi, Tian Ye, Ding Tong, Li Xingang
Tianjin Key Laboratory of Applied Catalysis Science & Technology, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300354, China

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Abstract In order to solve the problem of soot pollution in diesel emissions, a series of soot catalyst Mn/K2Ti8O17 with varying MnOx loadings were developed. The structure and redox properties of the catalysts were investigated by multiple techniques including X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2 temperature-programmed reduction (H2-TPR), temperature-programmed reduction of soot (soot-TPR), and their soot combustion performances were evaluated in a temperature programmed oxidation system. Results show that the support K2Ti8O17 has good catalytic performance, with enhanced activity after MnOx is loaded, the best loading content is 10%. The excellent catalytic performance of 10% Mn/K2Ti8O17 is attributed to the well-distributed MnOx particles, which has strong interaction with the support, leading to the abundance of Mn4+. Mn4+ plays a key role in redox cycles, thus the best redox property of the catalyst is obtained. Another factor contributing to the activity of 10% Mn/K2Ti8O17 is the profusion of surface absorbed oxygen as active oxygen, as well as the improved mobility of oxygen species. With good mobility of oxygen species, the consumption of absorbed oxygen in combustion process could be supplemented by the transfer of lattice oxygen, resulting in an accelerated reaction speed.
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Articles by authors
Zhai Yueyuan
Cao Chunmei
Xing Lingli
Yang Yuexi
Tian Ye
Ding Tong
Li Xingang
Keywordssoot;   catalytic combustion;   potassium titanate;   manganese oxide;   active oxygen species     
Received 2017-03-24;
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Zhai Yueyuan, Cao Chunmei, Xing Lingli, Yang Yuexi, Tian Ye, Ding Tong, Li Xingang.Preparation, Characterization and Catalytic Performance of Mn/K2Ti8O17 Used for Soot Combustion[J]  Chemcial Industry and Engineering, 2019,V36(3): 1-7
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