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Title of article :
Study of the origin of the deactivation of a Pt/CeO2 catalyst during reverse water gas shift (RWGS) reaction
Author/Authors :
A. Goguet، نويسنده , , F. Meunier ، نويسنده , , J.P. Breen، نويسنده , , Timothy R. Burch، نويسنده , , M.I. Petch، نويسنده , , A. Faur Ghenciu، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Pages :
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Abstract :
The effect of carbon deposition in the deactivation of a 2% Pt/CeO2 under RWGS conditions was investigated via an accelerated ageing procedure consisting of measuring the catalyst activity (under 1% CO2, 4% H2, 300 °C) before and after exposure to CO, CO2, H2, or CH4 at 400 °C. Exposure to CO led to severe deactivation while exposure to CO2, CH4, or H2 led to moderate or no deactivation. Additional activity measurements performed before and after exposure to CO followed by subsequent temperature-programmed oxidation (TPO) showed that exposure to increasing amounts of CO led to increased deposits of carbon and deactivation. No evidence for metal sintering was found. Additional TPO following catalyst exposure to RWGS conditions evidenced the deposition of carbonaceous deposits under the RWGS reactant mix.
Keywords :
bimetallic , X-ray photoelectron spectroscopy , Transmission electron microscopy , supported catalyst , Rhodium , Platinum
Journal title :
Journal of Catalysis
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Link To Document :