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Physicochemical properties of Pt-SO4/Al2O3 alkane oxidation catalysts

Gawthrope, D.E., Lee, A.F. and Wilson, K. (2004) Physicochemical properties of Pt-SO4/Al2O3 alkane oxidation catalysts. Physical Chemistry Chemical Physics, 6 (14). pp. 3907-3914. ISSN 1463-9076

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A series of sulfated alumina catalysts were synthesised by wet impregnation with sulfate-containing solutions. The degree of surface sulfation and corresponding surface acidity could be readily tuned by varying the molarity of impregnating solution. Strong acid treatments (>0.1 M) induced aluminium-sulfate crystallisation with a concomitant decrease in porosity and surface acidity. Platinum-doped sulfated aluminas showed enhanced activity towards methane, ethane and propane combustion. Activity scaled with the degree of accessible surface sulfate and platinum loading, however C–H bond scission appeared rate-limiting over both pure and presulfated aluminas. The magnitude of sulfate-promoted propane oxidation was greatest under heavily oxidising conditions (C3H6O2 > 120) but independent of Pt loading, confirming that support-mediated alkane activation is the dominant factor in the promotional mechanism.

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Chemistry (York)
Depositing User: York RAE Import
Date Deposited: 26 Feb 2009 14:26
Last Modified: 26 Feb 2009 14:26
Published Version: http://dx.doi.org/10.1039/b402623c
Status: Published
Publisher: Royal Society of Chemistry
Refereed: Yes
Identification Number: 10.1039/b402623c
URI: http://eprints.whiterose.ac.uk/id/eprint/7172

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