文献类型：期刊文献

英文题名：The promotional role of Ce in Cu/ZSM-5 and in situ surface reaction for selective catalytic reduction of NOx with NH3

作者：Lai, Shuangshuang[1];Meng, Dongmei[1];Zhan, Wangcheng[1];Guo, Yun[1];Guo, Yanglong[1];Zhang, Zhigang[1];Lu, Guanzhong[1]

机构：[1]E China Univ Sci & Technol, Res Inst Ind Catalysis, Key Labs Adv Mat, Shanghai 200237, Peoples R China

年份：2015

卷号：5

期号：110

起止页码：90235

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20154501521624);WOS:【SCI-EXPANDED(收录号:WOS:000364053500003)】；

基金：This work was supported financially by the National Natural Science Foundation of China (21577034, 21333003), the Commission of Science and Technology of Shanghai Municipality (15DZ1205305) and the Fundamental Research Funds for the Central Universities (WJ1514020).

语种：英文

外文关键词：Ammonia - Nitrogen oxides - Reaction intermediates - Cerium - Reduction - Selective catalytic reduction - Copper oxides - Surface reactions

摘要：Cu/ZSM-5 and Ce doped Cu/ZSM-5 catalysts were prepared by the incipient-wetness-impregnation method, and the effect of Ce doping on the structure and the catalytic performance of the Cu/ZSM-5 catalyst was investigated in detail for the selective catalytic reduction (SCR) of NO with NH3. The results showed that the addition of Ce can markedly broaden the operation temperature window of the Cu/ZSM-5 catalyst for NH3-SCR and enhance its H2O and SO2 resistance. The presence of Ce promoted an enrichment of copper species (isolated Cu2+ ions and CuO nanoparticles) on the catalyst surface and the increase in the Lewis acid sites on the surface of the Cu/ZSM-5 catalyst, and strengthened the redox property of the Cu/ZSM-5 catalyst. As a result, Ce-doped Cu/ZSM-5 catalyst possessed the high adsorption ability of NH3 and nitrite/nitrate, which is propitious to the increase in the reactivity of the Ce-doped Cu/ZSM-5 catalyst. In situ DRIFTS results indicated that the NH3-SCR reaction on the Cu/ZSM-5 catalyst and Ce-1-Cu-4/ZSM-5 catalysts definitely followed Langmuir-Hinshelwood mechanisms, and bridged nitrates and bidentate nitrates were the active intermediate. However, Eley-Rideal mechanism can't be confirmed over the Cu/ZSM-5 and Ce-1-Cu-4/ZSM-5 catalysts.