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Water gas shift activity and kinetics of Pt/Re catalysts supported on ceria-zirconia oxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
49142 46557 2006 6 PDF Available
Title
Water gas shift activity and kinetics of Pt/Re catalysts supported on ceria-zirconia oxides
Abstract

UTRC has developed a stable, high activity water gas shift (WGS) catalysts for the removal of carbon monoxide from hydrogen containing reformate, generated from natural gas. Hydrogen streams that contain lower concentrations of carbon monoxide poison can extend the life of proton exchange membrane (PEM) fuel cell stacks. This study presents WGS reactivity and kinetics experiments performed comparing platinum and platinum/rhenium (T.H. Vanderspurt, F. Wijzen, X. Tang, M.P. Leffler, R.R. Willigan, C.A. Newman, R. Radhakrishnan, F. Feng, B.L. Laube, Z. Dardas, S.M. Opalka, Y. She, US Patent Application 0235526 A1 (2003)) supported on high surface area (∼200 m2/g), nano-crystalline (∼4 nm) large average pore size (∼5 nm) ceria-zirconia under various reaction conditions. These represent gas compositions and temperatures that the catalysts see in fuel processing systems. It was found that rhenium enhanced the WGS activity of ceria-zirconia supported platinum catalysts and that rhenium carbonyl Re2(CO)10 was an optimal source for introducing rhenium to the platinum/ceria-zirconia catalysts. The optimal platinum to rhenium ratio for these catalysts was approximately 2:1 (Pt/Re) where the platinum loading was about 2 wt.%. A simple kinetic model adequately represents the rhenium promotion effect sufficient to size the WGS reactors for a system. This model suggests that the enhancement in reaction rates was a function of a larger positive order dependency for H2O concentration with lower inhibitory orders for CO2 and H2 concentrations for the platinum/rhenium catalyst compared to the platinum only catalyst.

Keywords
Water gas shift; Fuel cells; Fuel processing; Reaction kinetics; Ceria; Zirconia; Noble metal; Platinum; Rhenium
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Water gas shift activity and kinetics of Pt/Re catalysts supported on ceria-zirconia oxides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 66, Issues 1–2, 20 June 2006, Pages 23–28
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