催化作用
氮氧化物
兴奋剂
选择性催化还原
吸附
无机化学
氧化还原
氧气
布朗斯特德-洛瑞酸碱理论
氨
化学
材料科学
化学工程
物理化学
有机化学
工程类
燃烧
光电子学
作者
Xuesong Liu,Qifan Yu,Hongfeng Chen,Peng Jiang,Jianfa Li,Zhongyun Shen
标识
DOI:10.1016/j.apsusc.2019.144694
摘要
A series of S-doped MnOx/TiO2 catalysts were prepared by sol-gel method for the purpose of enhancing SCR performance. The obtained catalyst with mole ratio of S:Ti = 0.05:1 exhibited the best low temperature SCR performance and the widest active temperature window. According to the results of various analyses, the proper S was doped into TiO2 lattice via the replacement of Ti4+ by S4+ to generate TiOS bond, along with increasing surface area, more surface Mn4+ species and more active oxygen species (O2−). These enhanced properties improved the Brønsted acid sites and redox property of the properly S-doped MnOx/TiO2 catalyst. These advantages of S doping can essentially benefit the de-NOx ability of MnOx/TiO2 catalysts. Meanwhile, the in situ DRIFT experiments revealed that the adsorbed NH4+ and gas-phase NO2 species were greatly increased after proper S-doping, along with the enhanced reactivity of the adsorbed NH3 and NOx species. Both E-R and L-H mechanisms occurred on the S-doped catalysts, while the promoting effect of S-doping was performed by facilitating the L-H route during SCR reaction.
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