Investigation of the surface acidity and redox on the CeO2-WO3 catalyst for selective catalytic reduction with NH3

被引：0

作者：

Kang H.-Y. ^{[1
]}

Mo D.-J. ^{[2
]}

Zhang X.-J. ^{[2
]}

Zhang M.-R. ^{[2
]}

Gao H.-R. ^{[2
]}

Mao Y.-L. ^{[1
]}

Li H.-Y. ^{[2
]}

Song Z.-X. ^{[1
]}

机构：

[1] School of Municipal and Environmental Sciences, Henan University of Urban Construction, Pingdingshan, Pingdingshan City

[2] School of Environmental Science and Safety Engineering, Shenyang University of Chemical Technology, Shenyang, Shenyang City

来源：

Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | 2023年 / 51卷 / 06期

基金：

中国国家自然科学基金;

关键词：

calcination temperature; CeO[!sub]2[!/sub]-WO[!sub]3[!/sub; denitration; surface acidity;

D O I：

10.19906/j.cnki.JFCT.2023005

中图分类号：

学科分类号：

摘要：

CeO2-WO3 catalysts were successfully prepared by in-situ synthesis and used in the denitrification reaction. The best activity of CW-550 catalyst was achieved at a roasting temperature of 550 ℃, and the denitrification activity of CW-550 reached over 90% at 200 ℃. The superior catalytic performance of CW-550 catalyst can be attributed to the large specific surface area, more Ce3+ species, abundant surface acidity and superior redox performance. The increased Ce3+ facilitates the formation of oxygen vacancies and promotes redox performance. The introduction of WO3, into CeO2 can enhance the amounts of Brönsted acid, which contributes to the improvement of the adsorption and activation of ammonia, resulting in the excellent catalytic performance. The NH3-adsorbed species can react with gaseous NO. However, both of NH3-adsorbed and NO-adsorbed sepcies cannot participate in the SCR reaction effectively. Therefore, the SCR reaction of CW catalysts mainly follows the Eley-Rideal mechanism. © 2023 Science Press. All rights reserved.

引用

页码：812 / 822

页数：10

共 43 条

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