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H2O-tolerant monolithic catalysts for preferential oxidation of carbon monoxide in the presence of hydrogen

Paper ID Volume ID Publish Year Pages File Format Full-Text
42588 45932 2009 4 PDF Available
Title
H2O-tolerant monolithic catalysts for preferential oxidation of carbon monoxide in the presence of hydrogen
Abstract

Pt–Fe/mordenite (4 wt% Pt–0.5 wt% Fe) powder catalysts were wash-coated onto ceramic straight-channel monoliths by using silica- and/or alumina-sol as a binder, and were evaluated for the preferential oxidation of carbon monoxide (PROX) in a hydrogen-rich gas. In a synthetic reformate gas (1% CO, 1% O2, 5% H2O, 20% CO2, and balance H2), the CO concentration was reduced to less than 20 ppm at temperatures ranging from 100 to 130 °C. After a certain period of the PROX reaction, condensation of H2O in the pores of the mordenite-support occurred over the monolithic catalyst, which was wash-coated with alumina-sol, in the lower temperature range (100–120 °C), resulting in a rapid increase in CO concentration. The monolithic catalyst wash-coated with silica-sol, however, showed an excellent tolerance against H2O condensation and offered a stable catalytic performance, maintaining a CO concentration of ca. 20 ppm for 200 h. The H2O-tolerant characteristic was attributed to the relatively small adsorption amount of H2O over the silica-modified monolithic catalyst.

Graphical abstractThe monolithic catalyst wash-coated with silica-sol showed an excellent tolerance against H2O condensation and offered a stable catalytic performance, maintaining a CO concentration of ca. 20 ppm for 200 h.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Preferential oxidation of carbon monoxide; Pt–Fe/mordenite catalyst; Monolith; Silica-sol; Durability; PEFC
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H2O-tolerant monolithic catalysts for preferential oxidation of carbon monoxide in the presence of hydrogen
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 370, Issues 1–2, 30 November 2009, Pages 50–53
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