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

Jeong Hoi Goo; Muhammad Faisal Irfan; Sang Done Kim; Sung Chang Hong

doi:10.1016/j.chemosphere.2006.10.070

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

Chemosphere. 2007 Mar;67(4):718-23. doi: 10.1016/j.chemosphere.2006.10.070. Epub 2006 Dec 20.

Authors

Jeong Hoi Goo¹, Muhammad Faisal Irfan, Sang Done Kim, Sung Chang Hong

Affiliation

¹ Department of Chemical and Biomolecular Engineering, Energy and Environment Research Center, Korea Advanced Institute of Science and Technology, 305-701 Daejeon, Republic of Korea.

PMID: 17184819
DOI: 10.1016/j.chemosphere.2006.10.070

Abstract

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.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Ammonia / chemistry*
Catalysis
Nitrogen Dioxide / chemistry*
Nitrogen Oxides / chemistry*
Oxidation-Reduction
Sulfur Dioxide / chemistry*

Substances

Nitrogen Oxides
Sulfur Dioxide
Ammonia
Nitrogen Dioxide