期刊
CATALYSIS LETTERS
卷 150, 期 2, 页码 375-383出版社
SPRINGER
DOI: 10.1007/s10562-019-03077-y
关键词
V-W-Ce/Ti; Selective catalytic reduction; Denitrification; Low vanadium loadings; H2O and SO2 resistance
资金
- National Key Research and Development (R& D) Program of China [2017YFC0210500]
- National Natural Science Foundation of China [51938014]
The promoting effect of Ce on V-W/Ti catalyst for selective catalytic reduction (SCR) of NOx by NH3 was studied. Compared with the original V-W/Ti samples, addition of Ce contributed better NH3-SCR performance. The H2O and SO2 resistance of Ce modified V-W/Ti catalyst was improved by the different impregnation sequence of Ce. The catalysts were characterized by NH3-temperature programmed desorption (NH3-TPD), X-ray photoelectron spectroscopy (XPS), and H-2-temperature programmed reduction (H-2-TPR) techniques. The results showed that the impregnation sequence of W and Ce influenced the NH3 adsorption capacity of the catalysts. In comparison to 0.2V-5Ce-5W/Ti and 0.2V-(5Ce5W)/Ti, 0.2V-5W-5Ce/Ti catalyst contributed better H2O and SO2 resistance, with the highest Ce3+/(Ce4+ + Ce3+) value of 36.6%. Besides, a catalytic mechanism of SCR reactions over Ce-doped V-W/Ti catalysts was proposed. [GRAPHICS]
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