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Incorporation of zirconia onto silica for improved Pt/SiO2 catalysts for the selective reduction of NO by H2

Paper ID Volume ID Publish Year Pages File Format Full-Text
40968 45872 2012 10 PDF Available
Title
Incorporation of zirconia onto silica for improved Pt/SiO2 catalysts for the selective reduction of NO by H2
Abstract

The incorporation of zirconia onto the silica supports of platinum catalysts improved the selective reduction of NO by hydrogen in comparison to platinum catalysts supported on silica and alumina. The catalysts were characterized by X-ray diffraction, transmission electron microscopy, the temperature-programmed desorption of ammonia, X-ray photoelectron spectroscopy, and the adsorption of carbon monoxide. Their performances were examined in a flow microreactor and by in situ IR spectroscopy. The incorporation of zirconia onto silica created many strong acid sites and stabilized the dispersed platinum. It aided the adsorption of NO and enhanced the formation of ammonia on the platinum catalysts, even in the presence of excess oxygen. The formation of ammonia from NO and the subsequent removal of NO through reaction with ammonia considerably improved the conversion of NO and the yield of N2. The presence of zirconia also improved the stability of the supported platinum against hydrothermal treatment.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (167 K)Download as PowerPoint slideHighlights► Zirconia incorporated on silica improves the stability of platinum dispersed on it. ► Ammonia is produced over Pt(1.0)/Zr–SiO2 under excess oxygen. ► Pt/Zr–SiO2 exhibits good catalysis in the H2-SCR of NO at 75–150 °C. ► Zirconia incorporation improves platinum catalysts in the H2-SCR of NO.

Keywords
Selective catalytic reduction (SCR); NO; Hydrogen; Platinum; Silica; Zirconia incorporation
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Incorporation of zirconia onto silica for improved Pt/SiO2 catalysts for the selective reduction of NO by H2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 427–428, 15 June 2012, Pages 155–164
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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Any Questions? feel free to contact us