期刊
APPLIED SURFACE SCIENCE
卷 435, 期 -, 页码 406-414出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.11.109
关键词
Soot combustion; SnO2-based catalysts; Alkali metal oxides; Reactive surface oxygen; Surface promotional effects
类别
资金
- Natural Science Foundation of China [21567016, 21666020]
- Natural Science Foundation of Jiangxi Province [20151BBE50006, 20171BAB213013]
- Education Department Foundation of Jiangxi Province [KJLD14005]
- National Key Research and Development Program of China [2016YFC0205900]
In this study, SnO2-based catalysts promoted by different alkali metal oxides with a Sn/M (M = Li, Na, K, Cs) molar ratio of 9/1 have been prepared for soot combustion. In comparison with the un-modified SnO2 support, the activity of the modified catalysts has been evidently enhanced, following the sequence of CsSn1-9 > KSn1-9 > NaSn1-9 > LiSn1-9 > SnO2. As testified by Raman, H-2-TPR, soot-TPR-MS, XPS and O-2-TPD results, the incorporation of various alkali metal oxides can induce the formation of more abundant and mobile oxygen species on the surface of the catalysts. Moreover, quantified results have proved that the amount of the surface active oxygen species is nearly proportional to the activity of the catalysts. CsSn1-9, the catalyst promoted by cesium oxide, owns the largest amount of surface mobile oxygen species, thus having the highest activity among all the studied catalysts. It is concluded that the amount of surface active and mobile oxygen species is the major factor determining the activity of the catalysts for soot combustion. (c) 2017 Elsevier B.V. All rights reserved.
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