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Influence of H2, CO2 and H2O on the activity and deactivation behavior of Au/CeO2 catalysts in the water gas shift reaction at 300 °C

Paper ID Volume ID Publish Year Pages File Format Full-Text
47539 46475 2010 14 PDF Available
Title
Influence of H2, CO2 and H2O on the activity and deactivation behavior of Au/CeO2 catalysts in the water gas shift reaction at 300 °C
Abstract

The effect of H2, CO2 and H2O on the activity, stability and deactivation behavior of an oxidatively (O400) and a reductively (H400) pretreated 4.5 wt.% Au/CeO2 catalyst in the water gas shift (WGS) reaction at 300 °C was studied by kinetic and spectroscopic measurements, using different gas mixtures, going stepwise from idealized to a semi-realistic reaction atmosphere. The results were compared with data for the WGS reaction determined under similar reaction conditions at a lower reaction temperature of 180 °C [Y. Denkwitz, A. Karpenko, V. Plzak, R. Leppelt, B. Schumacher, R.J. Behm, J. Catal. 246 (2007) 74]. The formation/removal of adsorbed reaction intermediates and side products (surface carbonates, formates, OHad, COad) was followed by in situ IR spectroscopy (DRIFTS). Variation of the reaction gas mixture led to significant effects on the initial activity and the stability of the catalysts, which depend also on the pre-treatment of the catalysts. The resulting trends are compared with those obtained for reaction at 180 °C, consequences for the reaction mechanism and for applications in fuel gas processing at medium temperatures will be discussed.

Keywords
Water gas shift reaction; High temperature reaction; Reaction kinetics; Deactivation; Au catalysts; Au/CeO2; Realistic reformate; DRIFTS
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Influence of H2, CO2 and H2O on the activity and deactivation behavior of Au/CeO2 catalysts in the water gas shift reaction at 300 °C
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 95, Issues 1–2, 12 March 2010, Pages 57–70
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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Any Questions? feel free to contact us