期刊
CHEMICAL ENGINEERING JOURNAL
卷 288, 期 -, 页码 216-222出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.12.002
关键词
NH3-SCR; W doping; Surface Mn4+ active species; Low temperature activity; Mixed metal oxides
资金
- National Nature Science Foundation of China [21377015, 51178076]
- Major State Basic Research Development Program of China (973 Program) [2011CB936002]
- Key Laboratory of Industrial Ecology and Environmental Engineering, National Ministry of Education
The performances of a series of W-modified MnOx-TiO2 catalysts were investigated for selective catalytic reduction (SCR) of NOx with NH3. The catalyst prepared by one-pot co-precipitation method with an elementary ratio of W:Mn:Ti = 0.25:0.25:0.5 in raw materials showed a highest activity and a widest operation temperature window with 100% NOx conversion within 80-280 degrees C. We suggest that the enhancement in reducibility of manganese and dominant active Mn4+ species is likely one predominant factor accounting for the excellent SCR performance of the best catalyst. In situ FTIR studies revealed that after W doping, more Bronsted and Lewis acid sites formed on the catalyst surface, as well as more active intermediates (monodentate nitrate) during reaction, are also responsible for the high activity both at low and medium temperatures. (C) 2015 Elsevier B.V. All rights reserved.
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