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

Paper ID Volume ID Publish Year Pages File Format Full-Text
51435 46843 2009 4 PDF Available
Title
Impact of support and potassium-poisoning on the V2O5–WO3/ZrO2 catalyst performance in ammonia oxidation
Abstract

A series of WO3-promoted zirconia supports were synthesized and calcined between 400 and 800 °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 N2 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.

Keywords
SCR catalysts; Tungsten oxide; Vanadia; Potassium; Deactivation; NH3 oxidation; Zirconia; Crystallinity
First Page Preview
Impact of support and potassium-poisoning on the V2O5–WO3/ZrO2 catalyst performance in ammonia oxidation
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 10, Issue 6, 15 February 2009, Pages 803–806
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis