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Catalytic performance and characterization of Al2O3-supported Pt–Co catalyst coatings for preferential CO oxidation in a micro-reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
41806 45900 2010 9 PDF Available
Title
Catalytic performance and characterization of Al2O3-supported Pt–Co catalyst coatings for preferential CO oxidation in a micro-reactor
Abstract

Platinum–cobalt (Pt–Co) catalyst coatings are studied for preferential oxidation of carbon monoxide (PROX) in hydrogen-rich gas streams. Experimental results show a role for cobalt in improving catalytic activity. The most active catalyst coating can decrease carbon monoxide concentrations from 1% to a value of less than 10 ppm for GHSV values ranging from 40,000 to 120,000 ml g−1 h−1. This catalyst coating can work at a wide window of operation in terms of temperature. Transmission electron microscopy, selected-area electron diffraction, and diffuse reflectance infrared Fourier transform spectroscopy show that the addition of Co forms Pt3Co intermetallic compounds and slightly increases the average particle size. In situ laser Raman spectroscopy reveals the co-existence of Co metal and its oxides on the catalyst surface, due to gradual oxidation of Co by gas phase oxygen within the initial stage of the PROX reaction. The promotional effect of Co during PROX is confirmed and ascribed to this Pt3Co intermetallic compound and the synergetic effect of Co0 and Cox+. The high accessibility of the reactant to Pt3Co species appears favorable and crucial for PROX.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (122 K)Download as PowerPoint slideResearch highlights▶ Pt–Co catalyst coating can decrease CO concentration from 1% to less than 10 ppm. ▶ Co addition forms Pt3Co species and their accessibility appears crucial for PROX. ▶ Co promotional effect is due to Pt3Co species and Co0 and Cox+ synergetic effect.

Keywords
Preferential oxidation; Catalyst coating; Hydrogen purification; Carbon monoxide oxidation; Pt3Co intermetallic compound
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Catalytic performance and characterization of Al2O3-supported Pt–Co catalyst coatings for preferential CO oxidation in a micro-reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 387, Issues 1–2, 20 October 2010, Pages 215–223
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