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Influence of support acid pretreatment on the behaviour of CoOx/γ-alumina monolithic catalysts in the CH4-SCR reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
48869 46524 2006 9 PDF Available
Title
Influence of support acid pretreatment on the behaviour of CoOx/γ-alumina monolithic catalysts in the CH4-SCR reaction
Abstract

The effect of treatment with different mineral acids (H2SO4, H3PO4, HNO3 and HCl) on the activity of monolithic CoOx/γ-Al2O3 catalysts in the reduction of nitric oxide with methane in the presence of oxygen (CH4-SCR of NOx) was studied. Their behaviour in the methane oxidation reaction in both the presence and absence of NOx was determined in order to interpret the results in terms of intrinsic activity and competition between both processes. Depending on the nature of the acid used, significant differences were observed in the catalytic activities which were related to the textural states, surface acidities and the nature of the detected species. The best results were obtained after treatment with H2SO4, which increased the activity towards NOx elimination compared to the other catalysts. This behaviour was attributed not only to an increase in surface acidity but also to the stabilisation of the active Co2+ species, thus avoiding the formation of Co3O4 spinel that is responsible for the strongly adsorbed NOx species that lead to NO2 formation which increase the rate of the undesired methane oxidation reaction at high temperatures.

Keywords
Nitrogen oxides removal; DeNOx; HC-SCR; CoOx/γ-Al2O3; SCR monolithic catalysts
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Influence of support acid pretreatment on the behaviour of CoOx/γ-alumina monolithic catalysts in the CH4-SCR reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 67, Issues 3–4, 5 October 2006, Pages 270–278
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
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Any Questions? feel free to contact us