期刊
APPLIED SURFACE SCIENCE
卷 332, 期 -, 页码 130-137出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2015.01.118
关键词
Hydrothermal method; CeO2-ZrO2-WO3; Chemisorbed oxygen; Acidity; Redox property
类别
资金
- National Natural Science Foundation of China [U1137603, 21307047]
- Training Project of Yunnan Province [14118682]
The selective catalytic reduction (SCR) of NO by NH3 has been investigated over the CeO2-ZrO2-WO3 (CZW) catalysts prepared by hydrothermal synthesis, incipient impregnation, co-precipitation and sol-gel methods. The results indicate that the CZW catalyst prepared by hydrothermal method shows the best SCR activity, and more than 90% NO conversion is obtained at 195-450 degrees C with a gas hourly space velocity of 50,000 h(-1). The samples are characterized by XRD, N-2 adsorption-desorption, SEM, EDS, XPS, H-2-TPR, NH3-TPD and Pyridine-IR techniques. The results imply that the superior SCR activity of CZW catalyst is contributed to the excellent redox property, strong acidity and highest content of chemisorbed oxygen species. Furthermore, the larger surface area and greater total pore volume improve the redox ability and enhance NO conversion at low temperature, while the co-existence of Lewis and Bronsted acid sites enhance the SCR activity at high temperature. (C) 2015 Elsevier B.V. All rights reserved.
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