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  Methanol Steam Reforming over Indium-Promoted Pt/Al2O3 Catalyst: Nature of the Active Surface

Barbosa, R. L., Papaefthimiou, V., Law, Y. T., Teschner, D., Hävecker, M., Knop-Gericke, A., et al. (2013). Methanol Steam Reforming over Indium-Promoted Pt/Al2O3 Catalyst: Nature of the Active Surface. The Journal of Physical Chemistry C, 117(12), 6143-6150. doi:10.1021/jp309401q.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-649E-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-B86F-9
Genre: Journal Article

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Maniscript for JPhysChem C text+fig-rev (2).pdf (Any fulltext), 398KB
 
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 Creators:
Barbosa, Roland L.1, Author
Papaefthimiou, Vasiliki1, Author
Law, Yeuk T.1, Author
Teschner, Detre2, Author              
Hävecker, Michael2, 3, Author              
Knop-Gericke, Axel2, Author              
Zapf, Ralf4, Author
Kolb, Gunther4, Author
Schlögl, Robert2, Author              
Zafeiratos, Spyridon1, Author
Affiliations:
1Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), UMR 7515 Strasbourg, 25, rue Becquerel, F 67087 Strasbourg Cedex 2, France, ou_persistent22              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
3Helmholtz-Zentrum Berlin fuer Materialien und Energy GmbH, Division Solar Energy Research, Elektronenspeicherring BESSY II, ou_persistent22              
4Institut für Mikrotech Mainz GmbH IMM, D-55129 Mainz, Germany, ou_persistent22              

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 Abstract: The surface state of the Pt/In2O3/Al2O3 catalyst coated onto a microchannel stainless steel reactor was investigated under working conditions using synchrotron-based ambient pressure photoelectron (APPES) and X-ray absorption near-edge structure (XANES) spectroscopies, combined with online mass spectrometry. The surface of the fresh catalyst consists of metallic Pt, In2O3, and Al2O3. Reduction under 0.2 mbar of H2 at 250°C leads to surface enhancement of Pt and partial reduction of In2O3, while Al2O3 remains unchanged. Reoxidation in O2 atmosphere stimulates surface segregation of In2O3 over Pt, accompanied by partial oxidation of Pt to PtOx. Based on these results a dynamic, gas-phase-dependent surface state is demonstrated. Under methanol steam reforming conditions, the surface state rapidly adapts under the reaction stream regardless of the pretreatment. However, correlation of gas phase with spectroscopic results under working conditions pointed out the beneficial effect of surface indium to reduce the CO selectivity. Finally, evidence of a distorted symmetry of Al sites on Pt/In2O3/Al2O3 catalyst compared to that of γ-Al2O3 is given. The findings obtained in the present study are of fundamental significance in understanding the relation between the surface state and the catalytic performance of a functional methanol reforming catalyst.

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Language(s): eng - English
 Dates: 2013-03-072012-09-212013-03-072013-03-072013-03-28
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jp309401q
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Title: The Journal of Physical Chemistry C
  Other : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington DC : American Chemical Society
Pages: - Volume / Issue: 117 (12) Sequence Number: - Start / End Page: 6143 - 6150 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766