期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 352, 期 1, 页码 143-148出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.08.031
关键词
NO catalytic oxidation; NO2; MnOx/TiO2 composite nanoxides; Deposition-precipitation method
资金
- National High-Tech Research and Development Program (863) of China [2007AA061701]
- Ministry of Education, China
- Science Foundation of Zhejiang Province [Y5090053]
A series of MnOx/TiO2 composite nanoxides were prepared by deposition-precipitation (DP) method, and the sample with the Mn/Ti ratio of 0.3 showed a superior activity for NO catalytic oxidation to NO2. The maximum NO conversion over MnOx(0.3)/TiO2(DP) could reach 89% at 250 degrees C with a GHSV of 25,000 h(-1) which was much higher than that over the catalyst prepared by conventional wet-impregnation (WI) method (69% at 330 degrees C). Characterization results including XRD, HRTEM, FTIR, XPS, H-2-TPR, NO-TPD and Nitrogen adsorption-desorption implied that the higher activity of MnOx(0.3)/TiO2(DP) could be attributed to the enrichment of well-dispersed MnOx on the surface and the abundance of Mn3+ species. Furthermore, DRIFT investigations and long-time running test indicated that NO2 came from the decomposition of adsorbed nitrogen-containing species. (C) 2010 Elsevier Inc. All rights reserved.
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