Impact of support and potassium-poisoning on the V2O5-WO3/ZrO2 catalyst performance in ammonia oxidation

被引：6

作者：

Skotte, Johannes ^{[1
]}

Kustov, Arkady L.

Christensen, Claus Hviid

Fehrmann, Rasmus

机构：

[1] Tech Univ Denmark, Dept Chem, Kemitorvet 207, DK-2800 Lyngby, Denmark

来源：

CATALYSIS COMMUNICATIONS | 2009年 / 10卷 / 06期

基金：

新加坡国家研究基金会;

关键词：

SCR catalysts; Tungsten oxide; Vanadia; Potassium; Deactivation; NH3; oxidation; Zirconia; Crystallinity; REDUCTION; OXIDE; NO; REACTIVITY; ZIRCONIA; MECHANISM; NH3; WO3;

D O I：

10.1016/j.catcom.2008.12.002

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series Of WO3-promoted zirconia supports were synthesized and calcined between 400 and 800 degrees C. Subsequently vanadium oxide was introduced to obtain 3.5 wt% V2O5. The influence of the calcination temperature and potassium-poisoning (K/V = 0.2. molar ratio) on the catalytic activity in the selective catalytic reduction (SCR) of NO with NH3 was previously studied. Here, we focus on the influence of these parameters on the catalytic activity for the undesirable oxidation of ammonia, which decrease the N-2 selectivity of the SCR process. It is found that potassium doping of the catalysts results in a considerable decrease in the overall ammonia conversion while selectivity to NO increases. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：803 / 806

页数：4

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