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Catalytic combustion of methane over bimetallic Pd–Pt catalysts: The influence of support materials

Paper ID Volume ID Publish Year Pages File Format Full-Text
49096 46549 2006 11 PDF Available
Title
Catalytic combustion of methane over bimetallic Pd–Pt catalysts: The influence of support materials
Abstract

The effect of support material on the catalytic performance for methane combustion has been studied for bimetallic palladium–platinum catalysts and compared with a monometallic palladium catalyst on alumina. The catalytic activities of the various catalysts were measured in a tubular reactor, in which both the activity and stability of methane conversion were monitored. In addition, all catalysts were analysed by temperature-programmed oxidation and in situ XRD operating at high temperatures in order to study the oxidation/reduction properties.The activity of the monometallic palladium catalyst decreases under steady-state conditions, even at a temperature as low as 470 °C. In situ XRD results showed that no decomposition of bulk PdO into metallic palladium occurred at temperatures below 800 °C. Hence, the reason for the drop in activity is probably not connected to the bulk PdO decomposition.All Pd–Pt catalysts, independently of the support, have considerably more stable methane conversion than the monometallic palladium catalyst. However, dissimilarities in activity and ability to reoxidise PdO were observed for the various support materials. Pd–Pt supported on Al2O3 was the most active catalyst in the low-temperature region, Pd–Pt supported on ceria-stabilised ZrO2 was the most active between 620 and 800 °C, whereas Pd–Pt supported on LaMnAl11O19 was superior for temperatures above 800 °C. The ability to reoxidise metallic Pd into PdO was observed to vary between the supports. The alumina sample showed a very slow reoxidation, whereas ceria-stabilised ZrO2 was clearly faster.

Keywords
Palladium; Platinum; Bimetal; Catalytic combustion; Zirconia; Alumina; Hexaaluminate; Ceria; Yttria; Methane
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Catalytic combustion of methane over bimetallic Pd–Pt catalysts: The influence of support materials
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 66, Issues 3–4, 20 July 2006, Pages 175–185
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