Identification of the arsenic resistance on MoO3 doped CeO2/TiO2 catalyst for selective catalytic reduction of NOx with ammonia

被引：72

作者：

Li, Xiang ^{[1
]}

Li, Xiansheng ^{[1
]}

Li, Junhua ^{[1
]}

Hao, Jiming ^{[1
]}

机构：

[1] Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2016年 / 318卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

NH3-SCR; As poisoning; CO4+ to Ce3+ redox cycle; MoO3; NOx adsorbed species; MIXED-OXIDE CATALYST; TUNGSTEN-OXIDE; SCR CATALYSTS; ACTIVE-SITES; NITRIC-OXIDE; NH3; MECHANISM; DEACTIVATION; PERFORMANCE; ACIDITY;

D O I：

10.1016/j.jhazmat.2016.07.058

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Arsenic resistance on MoO3 doped CeO2/TiO2 catalysts for selective catalytic reduction of NOx with NH3 (NH3-SCR) is investigated. It is found that the activity loss of CeO2-MoO3/TiO2 caused by As oxide is obviousiess than that of CeO2/TiO2 catalysts. The fresh and poisoned catalysts are compared and analyzed using XRD, Raman, XPS, H-2-TPR and in situ DRIFTS. The results manifest that the introduction of arsenic oxide to CeO2/TiO2 catalyst not only weakens BET surface area, surface acid sites and adsorbed NOx species, but also destroy the redox circle of Ce4+ to Ce3+ because of interaction between Ce and As. When MoO3 is added into CeO2/TiO2 system, the main SCR reaction path are found to be changed from the reaction between coordinated NH3 and ad-NOx species to that between an amide and gaseous NO. Additionally, for CeO2-MoO3/TiO2 catalyst, As toxic effect on active sites CeO2 can be released because of stronger As-Mo interaction. Moreover, not only are the reactable Bronsted and Lewis acid sites partly restored, but the cycle of Ce4+ to Ce3+ can also be free to some extent. (C) 2016 Published by Elsevier B.V.

引用

页码：615 / 622

页数：8

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