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Issue 1, 2015
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Electrochemically dealloyed platinum with hierarchical pore structure as highly active catalytic coating

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Abstract

Micro structured reactors are attractive candidates for further process intensification in heterogeneous catalysis. However, they require catalytic coatings with significantly improved space-time yields compared to traditional supported catalysts. We report the facile synthesis of homogeneous nanocrystalline Pt coatings with hierarchical pore structure by electrochemical dealloying of amorphous sputter-deposited platinum silicide layers. Thickness, porosity and surface composition of the catalysts can be controlled by the dealloying procedure. XPS analysis indicates that the catalyst surface is primarily composed of metallic Pt. Catalytic tests in gas-phase hydrogenation of butadiene reveal the typical activity, selectivity and activation energy of nanocrystalline platinum. However, space time yields are about 13 to 200 times higher than values reported for Pt-based catalysts in literature. The highly open metallic pore structure prevents heat and mass transport limitations allowing for very fast reactions and reasonable stability at elevated temperatures.

Graphical abstract: Electrochemically dealloyed platinum with hierarchical pore structure as highly active catalytic coating

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Publication details

The article was received on 01 Jul 2014, accepted on 17 Sep 2014 and first published on 26 Sep 2014


Article type: Paper
DOI: 10.1039/C4CY00851K
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Catal. Sci. Technol., 2015,5, 206-216
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    Electrochemically dealloyed platinum with hierarchical pore structure as highly active catalytic coating

    R. Kraehnert, E. Ortel, B. Paul, B. Eckhardt, M. Kanis, R. Liu and A. Antoniou, Catal. Sci. Technol., 2015, 5, 206
    DOI: 10.1039/C4CY00851K

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