Title of article :
A comparative in situ XPS study of PtRuCo catalyst in methanol steam reforming and water gas shift reactions
Author/Authors :
S. Zafeiratos، نويسنده , , F. Paloukis، نويسنده , , G. Papakonstantinou، نويسنده , , D. Teschner، نويسنده , , M. Havecker، نويسنده , , E. Vass، نويسنده , , P. Schn?rch، نويسنده , , A. Knop-Gericke، نويسنده , , R. Schlogl ، نويسنده , , B. MORENO، نويسنده , , E. Chinarro، نويسنده , , J.R. Jurado، نويسنده , , S.G. Neophytides، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Pages :
7
From page :
250
To page :
256
Abstract :
In the present study the oxidation state and the surface composition of a ternary PtRuCo catalyst were investigated under methanol steam reforming (SRM) and water gas shift (WGS) reaction conditions at 570 K. Ambient pressure X-ray photoelectron spectroscopy (APPES) was applied in situ at 0.5 mbar, while simultaneously monitoring the catalytic activity of the sample by on-line mass spectrometry. Non-destructive depth profile measurements performed under SRM reaction conditions over a polycrystalline PtCo foil, were also used to obtain detailed depth-resolved information. The results showed that surface segregation of cobalt and modification of its oxidation state occurs when switching from SRM to WGS reaction conditions. Evidence of ionic Pt was found only during WGS reaction, while Ru was mainly present in the metallic state. The results clearly demonstrate the dynamic response of the PtRuCo catalytic surface to the reaction atmosphere.
Keywords :
Water gas shift reaction , direct methanol fuel cells , Ambient pressure photoelectron spectroscopy , Methanol steam reforming reaction , PtRuCo catalyst
Journal title :
CATALYSIS TODAY
Serial Year :
2010
Journal title :
CATALYSIS TODAY
Record number :
1237583
Link To Document :
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