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The adsorption and reaction of alcohols on TiO2 and Pd/TiO2 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
40469 45855 2013 8 PDF Available
Title
The adsorption and reaction of alcohols on TiO2 and Pd/TiO2 catalysts
Abstract

The decomposition of alcohols (methanol, ethanol, n-propanol, i-propanol) on TiO2 and Pd/TiO2 catalysts has been studied using temperature programmed desorption. The alcohols mainly decompose via a dehydration pathway on TiO2 catalysts, with no evidence for reactions involving α CC scission or dehydrogenation. However, the reaction pathway was fundamentally altered by the presence of Pd nanoparticles, and products of α CC scission became dominant due to decarbonylation pathways. For the reaction with ethanol, there was no evidence of the dehydration product ethylene even though the surface is mainly composed of titania, indicating that diffusion of alkoxy species from the support to the Pd occurs efficiently during TPD. However, competing dehydration reactions did occur on Pd/TiO2 in the cases of n-propanol and i-propanol decomposition which is postulated to be due to more limited diffusivity of the bulkier alkoxides.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (87 K)Download as PowerPoint slideHighlights► We report decomposition pathways for alcohol decomposition on titania and Pd–TiO2. ► These catalysts are active for photocatalytic reforming and hydrogen production. ► Two dehydration pathways are identified on titania, monomolecular and bimolecular. ► With Pd addition pathways are changed to mainly dehydrogenation/decarbonylation. ► We suggest that reverse spillover of ethoxy occurs from the support to the metal nanoparticles.

Keywords
Alcohol reactivity; TPD; Methanol; Ethanol; Propanol; TiO2 catalyst; Pd–TiO2 catalyst; Photocatalysis
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The adsorption and reaction of alcohols on TiO2 and Pd/TiO2 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 454, 15 March 2013, Pages 66–73
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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