期刊
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
卷 30, 期 6, 页码 1005-1010出版社
HIGHER EDUCATION PRESS
DOI: 10.1007/s40242-014-4161-4
关键词
Selective catalytic reduction; Iron; Tungsten; Reaction mechanism
资金
- National High Technology Research and Development Program of China [2012AA062505]
- Project of the Central Research Institutes of Basic Research and Public Service Special Operations, China [2013-YSKY-01]
The W-doped Fe/TiO2 catalyst prepared by an impregnation method exhibited a good NH3-selective catalytic reduction(SCR) activity and N-2 selectivity with broad operation temperature window. The interaction between Fe and W could increase the amount of surface chemisorbed oxygen, and thus enhances the low temperature SCR activity by facilitating the fast SCR of 2NH(3)+NO+NO2 -> 2N(2)+3H(2)O. The NH3-SCR reaction mechanism over the W-Fe/TiO2 was fully investigated via in situ diffuse reflectance infrared Fourier transform spectroscopy(in situ DRIFTS). In the low temperature range(<250 degrees C), the reactive surface species were mainly coordinated NH3, ionic NH4+ and adsorbed NO2 species, and the SCR mainly followed the Langmuir-Hinshelwood mechanism, during which the adsorbed NO2 species became the important active sites. In the high temperature range(>250 degrees C), the reactive surface species were mainly NH2, and the SCR mainly followed the Eley-Rideal mechanism, during which the formation of NH2NO intermediate species after H-abstraction of NH3 was the rate-determining step.
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