Journal
CHEMSUSCHEM
Volume 7, Issue 9, Pages 2516-2526Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201402357
Keywords
catalyst characterization; heterogeneous catalysis; methanol reforming; molten salts; platinum
Funding
- Deutsche Forschungsgemeinschaft (DFG) within the Excellence Cluster Engineering of Advanced Materials
- EU through ERC Advanced Investigator Grant [267376]
- Fonds der Chemischen Industrie
- DAAD
- COST Action [CM1104]
- European Research Council (ERC) [267376] Funding Source: European Research Council (ERC)
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We herein describe a straight forward procedure to increase the performance of platinum-on-alumina catalysts in methanol steam reforming by applying an alkali hydroxide coating according to the solid catalyst with ionic liquid layer (SCILL) approach. We demonstrate by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and temperature-programmed desorption (TPD) studies that potassium doping plays an important role in the catalyst activation. Moreover, the hygroscopic nature and the basicity of the salt modification contribute to the considerable enhancement in catalytic performance. During reaction, a partly liquid film of alkali hydroxides/carbonates forms on the catalyst/alumina surface, thus significantly enhancing the availability of water at the catalytically active sites. Too high catalyst pore fillings with salt introduce a considerable mass transfer barrier into the system as indicated by kinetic studies. Thus, the optimum interplay between beneficial catalyst modification and detrimental mass transfer effects had to be identified and was found on the applied platinum-on-alumina catalyst at KOH loadings around 7.5 mass%.
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