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Title: Selective catalytic reduction of NO sub x with ammonia

Abstract

This paper reports that Selective Catalytic Reduction (SCR) offers a powerful post-combustion pollution control technique for removal of NO{sub x} from stationary combustion sources. In the SCR reaction, NO{sub x} is reduced with ammonia in the presence of oxygen over a catalyst, giving N{sub 2} and H{sub 2}O. In this study, selective catalytic reduction of NO{sub x} with ammonia was investigated over supported and unsupported vanadia catalysts. All catalyst samples were characterized using BET surface area measurement, X-ray diffraction, laser Raman spectroscopy, and scanning electron microscopy techniques. The effect of support material, catalyst loading, oxygen concentration, temperature, and NH{sub 3}/NO ratio on the conversion of NO was investigated. Catalysts supported over titania were found to have the highest activity for NO{sub x} reduction. The selectivity was observed to go through a maximum with increasing temperature, oxidation of ammonia becoming significant at temperatures above 300{degrees} C. The rate of reaction was found to be a stronger function of NO concentration than of NH{sub 3} concentration. It was also seen that presence of gas phase oxygen was essential for the reaction to proceed.

Authors:
;  [1]
  1. Ohio State Univ., Dept. of Chemical Engineering, Columbus, OH (US)
Publication Date:
OSTI Identifier:
5409773
Resource Type:
Journal Article
Journal Name:
International Journal of Energy-Environment-Economics; (United States)
Additional Journal Information:
Journal Volume: 1:1
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AIR POLLUTION CONTROL; SELECTIVE CATALYTIC REDUCTION; CATALYSTS; STATIONARY POLLUTANT SOURCES; AMMONIA; COMBUSTION; CONCENTRATION RATIO; EFFICIENCY; NITROGEN OXIDES; OXYGEN; RAMAN SPECTROSCOPY; REACTION KINETICS; SCANNING ELECTRON MICROSCOPY; TEMPERATURE EFFECTS; VANADIUM; X-RAY DIFFRACTION; CHALCOGENIDES; CHEMICAL REACTIONS; COHERENT SCATTERING; CONTROL; DENITRIFICATION; DIFFRACTION; ELECTRON MICROSCOPY; ELEMENTS; HYDRIDES; HYDROGEN COMPOUNDS; KINETICS; LASER SPECTROSCOPY; METALS; MICROSCOPY; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; NONMETALS; OXIDATION; OXIDES; OXYGEN COMPOUNDS; POLLUTION CONTROL; POLLUTION SOURCES; REDUCTION; SCATTERING; SPECTROSCOPY; THERMOCHEMICAL PROCESSES; TRANSITION ELEMENTS; 540120* - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-)

Citation Formats

Cal, Y, and Ozkan, U S. Selective catalytic reduction of NO sub x with ammonia. United States: N. p., 1991. Web.
Cal, Y, & Ozkan, U S. Selective catalytic reduction of NO sub x with ammonia. United States.
Cal, Y, and Ozkan, U S. Tue . "Selective catalytic reduction of NO sub x with ammonia". United States.
@article{osti_5409773,
title = {Selective catalytic reduction of NO sub x with ammonia},
author = {Cal, Y and Ozkan, U S},
abstractNote = {This paper reports that Selective Catalytic Reduction (SCR) offers a powerful post-combustion pollution control technique for removal of NO{sub x} from stationary combustion sources. In the SCR reaction, NO{sub x} is reduced with ammonia in the presence of oxygen over a catalyst, giving N{sub 2} and H{sub 2}O. In this study, selective catalytic reduction of NO{sub x} with ammonia was investigated over supported and unsupported vanadia catalysts. All catalyst samples were characterized using BET surface area measurement, X-ray diffraction, laser Raman spectroscopy, and scanning electron microscopy techniques. The effect of support material, catalyst loading, oxygen concentration, temperature, and NH{sub 3}/NO ratio on the conversion of NO was investigated. Catalysts supported over titania were found to have the highest activity for NO{sub x} reduction. The selectivity was observed to go through a maximum with increasing temperature, oxidation of ammonia becoming significant at temperatures above 300{degrees} C. The rate of reaction was found to be a stronger function of NO concentration than of NH{sub 3} concentration. It was also seen that presence of gas phase oxygen was essential for the reaction to proceed.},
doi = {},
url = {https://www.osti.gov/biblio/5409773}, journal = {International Journal of Energy-Environment-Economics; (United States)},
number = ,
volume = 1:1,
place = {United States},
year = {1991},
month = {1}
}