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

Bahruji, Hasliza, Bowker, Michael, Brookes, Catherine, Davies, Philip Rosser and Wawata, Ibrahim 2013. The adsorption and reaction of alcohols on TiO2 and Pd/TiO2 catalysts. Applied Catalysis A: General 454 , pp. 66-73. 10.1016/j.apcata.2013.01.005

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

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Uncontrolled Keywords: Alcohol reactivity; TPD; Methanol; Ethanol; Propanol; TiO2 catalyst; Pd–TiO2 catalyst; Photocatalysis
Publisher: Elsevier
ISSN: 0926-860X
Last Modified: 13 May 2019 19:39
URI: http://orca.cf.ac.uk/id/eprint/46309

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