{sup 15}N-labelling studies of the effect of water on the reduction of NO with NH{sub 3} over chromia SCR catalysts in the absence and presence of O{sub 2}
- School of Chemical Engineering and Industrial Chemistry, New South Wales (Australia)
- Macquarie Univ., New South Wales (Australia)
- Division of Coal and Energy Technology, New South Wales (Australia)
Activity studies and isotopic experiments have been performed to determine the effect of water on the reaction of NO and NH{sub 3}, in the absence and presence of oxygen, for both amorphous and crystalline ({alpha}-Cr{sub 2}O{sub 3}) chromia catalysts. The products of the reaction of {sup 15}NO and {sup 14}NH{sub 3} were determined using mass spectrometry, Fourier transform infrared spectroscopy, and gas chromatography. In the presence of excess (1.8%) O{sub 2}, the addition of 1.5% H{sub 2}O decreases NO and NH{sub 3} conversions over amorphous chromia for all temperatures below 275{degrees}C. For {alpha}-Cr{sub 2}O{sub 3}, the effect of water varies with reaction temperature: at temperatures less than 225{degrees}C, NO conversion is lower with water present, whereas above 225{degrees}C, higher NO conversions are observed under wet gas conditions. The effect of water on activity and selectivity is reversible. 28 refs., 7 figs., 2 tabs.
- OSTI ID:
- 98970
- Journal Information:
- Journal of Catalysis, Vol. 154, Issue 1; Other Information: PBD: Jun 1995
- Country of Publication:
- United States
- Language:
- English
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