Deactivation Mechanism of Potassium on the V2O5/CeO2 Catalysts for SCR Reaction: Acidity, Reducibility and Adsorbed-NOx

被引：154

作者：

Peng, Yue ^{[1
]}

Li, Junhua ^{[1
,2
]}

Huang, Xu ^{[1
]}

Li, Xiang ^{[1
]}

Su, Wenkang ^{[1
]}

Sun, Xiaoxu ^{[1
]}

Wang, Dezhi ^{[3
]}

Hao, Jiming ^{[1
,2
]}

机构：

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

[2] Tsinghua Univ, State Environm Protect Key Lab Sources & Control, Beijing 100084, Peoples R China

[3] Beijing Guodian Longyuan Environm Engn Co LTD, Beijing 100084, Peoples R China

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2014年 / 48卷 / 08期

基金：

中国国家自然科学基金;

关键词：

DEFINED SURFACE PLANES; CHEMICAL DEACTIVATION; RAMAN-SPECTROSCOPY; CEO2; NANOCRYSTALS; LUBRICATION OILS; UREA SOLUTION; NITRIC-OXIDE; REDUCTION; AMMONIA; ALKALI;

D O I：

10.1021/es405602a

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A series of V2O5/CeO2 catalysts with different potassium loadings were prepared to investigate alkali deactivations for selective catalytic reduction of NOx with NH3. An alkali poisoning mechanism could be attributed to surface acidity, reducibility, and NOx adsorption/desorption behaviors. The detailed factors are as follows: (1) decrease of surface acidity suppresses NH3 adsorption by strong bonding of alkali to vanadia (major factor); (2) low reducibility prohibits NH3 activation and NO oxidation by formation bonding of alkali to vanadia and ceria (important factor); (3) active NOx- species at low temperature diminish because of coverage of alkali on the surfaces (minor factor); and (4) stable, inactive nitrate species at high temperature increase by generating new basic sites (important factor).

引用

页码：4515 / 4520

页数：6

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