Effect of copper contents on sulfur poisoning of copper ion-exchanged mordenite for NO reduction by NH{sub 3}
- Pohang Univ. of Science and Technology (Korea, Republic of)
Deactivation of copper ion-exchanged mordenite (CuHM) catalysts with different copper contents by SO{sub 2} for NO reduction with NH{sub 3} was examined in a fixed bed flow reactor. A larger amount of deactivating agent deposits on the catalyst surface with the increase of copper contents under the same operating conditions. The deactivating agents deposited on the copper-exchanged mordenite catalysts were mainly (NH{sub 4}){sub 2}SO{sub 4} and/or NH{sub 4}HSO{sub 4} from the results of thermal analyses such as thermogravimetric analysis (TGA), differential thermal analysis (DTA), and temperature-programmed desorption (TPD). The formation of the ammonium salts largely depends on the reaction temperature and SO{sub 3} concentration generated from SO{sub 2} oxidation which is a reaction catalyzed primarily by copper ions on the catalyst surface. The catalytic activity and surface area of the deactivated catalysts are well-correlated with the sulfur content deposited on the catalyst surface, depending upon the reaction temperatures and its catalyst copper contents.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 178417
- Journal Information:
- Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 5 Vol. 34; ISSN IECRED; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
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