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Selective catalytic reduction of NO by C2H2 over MoO3/HZSM-5

Paper ID Volume ID Publish Year Pages File Format Full-Text
48987 46536 2007 8 PDF Available
Title
Selective catalytic reduction of NO by C2H2 over MoO3/HZSM-5
Abstract

Molybdenum impregnated HZSM-5 zeolite catalysts with MoO3 loading from 1 to 8 wt.% were studied in detail for the selective catalytic reduction (C2H2-SCR) of NO by acetylene. A 83.9% of NO could be removed by the reductant at 350 °C under 1600 ppm of NO, 800 ppm of C2H2 and 9.95% of O2 in He over 2%MoO3/HZSM-5 catalyst with a specific activity of 0.09 mmol h-1 gcat-1 in NO elimination and the competitiveness factor (c.f.) of 33.6% for the reductant. The NO elimination level and the c.f. value were ca. 3–4 times as high as those using methane or propene as reductant over the catalyst in the same reaction condition. About same reaction rate was estimated in NO oxidation as that in the NO reduction over each xMoO3/HZSM-5 (x = 0–8%) catalyst, which confirms that NO2 is a crucial intermediate for the aimed reaction over the catalysts. Appropriate amount of Mo incorporation to HZSM-5 considerably enhanced the title reaction, both by accelerating the intermediate formation and by strengthening the adsorption NOx on the catalyst surface under the reaction conditions. Rather lower adsorption tendency of acetylene compared with propene on the catalysts explains the catalyst's steady performance in the C2H2-SCR of NO and rapid deactivation in the C3H6-SCR of NO.

Keywords
SCR; Acetylene; NO; Zeolite; Molybdenum catalysts
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Selective catalytic reduction of NO by C2H2 over MoO3/HZSM-5
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 71, Issues 3–4, 15 February 2007, Pages 246–253
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
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us