Effects of NO2 and SO2 on selective catalytic reduction of nitrogen oxides by ammonia

The selective catalytic reduction (SCR) characteristics of NO and NO(2) over V(2)O(5)-WO(3)-MnO(2)/TiO(2) catalyst using ammonia as a reducing agent have been determined in a fixed-bed reactor at 200-400 degrees C. The presence of NO(2) enhances the SCR activity at lower temperatures and the optimum...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2007-03, Vol.67 (4), p.718-723
Main Authors: Goo, Jeong Hoi, Irfan, Muhammad Faisal, Kim, Sang Done, Hong, Sung Chang
Format: Article
Language:English
Subjects:
Ammonia - chemistry
Applied sciences
Atmospheric pollution
Catalysis
Exact sciences and technology
General processes of purification and dust removal
Nitrogen Dioxide - chemistry
Nitrogen Oxides - chemistry
Oxidation-Reduction
Pollution
Prevention and purification methods
Sulfur Dioxide - chemistry
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Summary:The selective catalytic reduction (SCR) characteristics of NO and NO(2) over V(2)O(5)-WO(3)-MnO(2)/TiO(2) catalyst using ammonia as a reducing agent have been determined in a fixed-bed reactor at 200-400 degrees C. The presence of NO(2) enhances the SCR activity at lower temperatures and the optimum ratio of NO(2)/NO(x) is found to be 0.5. During the SCR reactions, there are some side reactions occurred such as ammonia oxidation and N(2)O formation. At higher temperatures, the selective catalytic oxidation of ammonia and the nitrous oxide formation compete with the SCR reactions. The denitrification (DeNO(x)) conversion decreases at lower temperatures but it increases at higher temperatures with increasing SO(2) concentration. The presence of SO(2) in the feeds inhibits N(2)O formation.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2006.10.070