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Structured bimetallic Pd-Pt/γ-Al2O3 catalysts on FeCrAlloy fibers for total combustion of methane

Paper ID Volume ID Publish Year Pages File Format Full-Text
48571 46513 2007 12 PDF Available
Title
Structured bimetallic Pd-Pt/γ-Al2O3 catalysts on FeCrAlloy fibers for total combustion of methane
Abstract

Bimetallic Pd-Pt/Al2O3 catalysts were deposited by dip coating on FeCrAlloy-type fibers. The influence of different gaseous pretreatments (under O2/H2 or H2 flows) on the physico-chemical properties and the catalytic activity in the total combustion of methane were investigated. Dispersion of Pd and Pt appeared to be a crucial parameter for the catalytic performances. All directly calcined catalysts displayed better catalytic behaviour than the pretreated ones. Long duration tests demonstrated that a bimetallic Pd-Pt catalyst has a better catalytic behaviour than a Pd-based one, which undergoes through sintering as evidenced by the formation of larger agglomerates. After the long duration test, palladium is in a fully oxidized state (PdO) (as well as platinum (PtO)). It is suggested that the better catalytic behaviour of the Pt-Pd catalyst could be due to an active cooperation between PtO, formed during the early stages of the catalytic reaction, and PdO. Two hypotheses can be put forward; in the first case, PtO could supply oxygen atoms to PdO, which actually would play the active role in the catalytic reaction. In the second case, CH4 would be adsorbed and dissociated on Pt atoms, and PdO would supply oxygen atoms leading to the formation of CO2.

Keywords
Methane combustion; Palladium; Platinum; FeCrAlloy fibers; Long duration tests
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Structured bimetallic Pd-Pt/γ-Al2O3 catalysts on FeCrAlloy fibers for total combustion of methane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 75, Issues 1–2, 29 August 2007, Pages 59–70
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