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

Authors:  Hasliza Bahruji, Michael Bowker, Catherine Brookes, Philip R. Davies, Ibrahim Wawata

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 C C scission or dehydrogenation. However, the reaction pathway was fundamentally altered by the presence of Pd nanoparticles, and products of C C 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.

Keywords:
Alcohol reactivity
TPD
Methanol
Ethanol
Propanol
TiO₂ catalyst
Pd–TiO₂ catalyst
Photocatalysis

Published in: Applied catalysis A: General  (Volume 454, Pages 1-172, 15 March 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

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

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