Selective Catalytic Reduction of NOx with NH3 over Ti0.9M0.1O2- Nanocomposites Catalysts Prepared by Solution Combustion Synthesis
The SCS method was applied to synthesize a series of TiMO2- (Mn, V, Ce, Fe, Zr, La, Co, Cr, Cu) nanocomposites catalysts. The catalysts with the active component of Mn, V, Ce, and Fe have high activity. According to the principle of complementary advantages, we prepare the binary compound metal oxide catalysts Ti0.9M0.05N0.05O2- by the doping method, and find that the Mn doped catalysts of Ti0.9Mn0.05V0.05O2- and Ti0.9Mn0.05Fe0.05O2- are highly active at low temperatures ( < 150 - ). The N2 selectivity at high temperature is significantly improved by doping 5% Ce into Ti0.9V0.1O2- . The structural and physical-chemical properties of catalysts were characterized comprehensively by BET, XRD, TEM, and XPS. The results indicated that the SCS catalysts have large specific surface area and the total desorption pore volume, small pore diameter and particle size, and the active component were highly dispersed over the catalysts. The Ce substitution led to high concentration of chemisorbed oxygen, which resulted in superior N2 selectivity. Furthermore, the SCR reaction mechanism over TiCeVO catalyst was examined using in situ DRIFTS. The result revealed that high active monodentate nitrate and bridging nitrate species as well as abundant ionic NH4+ (BrOnsted acide sites) were the key intermediates in the SCR reaction.
Bin Guan He Lin Liucheng Zhong Wenjie Dong Zhen Huang
Shanghai Jiao Tong University,China
国际会议
上海
英文
1-10
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）