Ammonium Ion Enhanced V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction with Ammonia

被引:8
作者
Lee, Min Seong [1 ,2 ]
Kim, Sun-, I [1 ]
Jeong, Bora [1 ]
Park, Jin-Woo [2 ,3 ]
Kim, Taehyo [1 ]
Lee, Jung Woo [2 ]
Kwon, Gibum [4 ]
Lee, Duck Hyun [1 ]
机构
[1] Korea Inst Ind Technol, Green Mat & Proc R&D Grp, Ulsan 44413, South Korea
[2] Pusan Natl Univ, Dept Mat Sci & Engn, Busan 46241, South Korea
[3] NANO Co Ltd, Sangju 37257, South Korea
[4] Univ Kansas, Dept Mech Engn, Lawrence, KS 66045 USA
关键词
selective catalytic reduction; V-based catalyst; NOX removal efficiency; silane; ammonium; NH3-SCR REACTION; SCR CATALYST; NOX; PERFORMANCE; NH3; MN-CE/TIO2; MECHANISM; OXIDE; NH4+;
D O I
10.3390/nano11102677
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Selective catalytic reduction (SCR) is the most efficient NOX removal technology, and the vanadium-based catalyst is mainly used in SCR technology. The vanadium-based catalyst showed higher NOX removal performance in the high-temperature range but catalytic efficiency decreased at lower temperatures, following exposure to SOX because of the generation of ammonium sulfate on the catalyst surface. To overcome these limitations, we coated an NH4+ layer on a vanadium-based catalyst. After silane coating the V2O5-WO3/TiO2 catalyst by vapor evaporation, the silanized catalyst was heat treated under NH3 gas. By decomposing the silane on the surface, an NH4+ layer was formed on the catalyst surface through a substitution reaction. We observed high NOX removal efficiency over a wide temperature range by coating an NH4+ layer on a vanadium-based catalyst. This layer shows high proton conductivity, which leads to the reduction of vanadium oxides and tungsten oxide; additionally, the NOX removal performance was improved over a wide temperature range. These findings provide a new mothed to develop SCR catalyst with high efficiency at a wide temperature range.
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页数:11
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