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The mechanism of surface doping in vanadyl pyrophosphate, catalyst for n-butane oxidation to maleic anhydride: The role of Au promoter

Luciani, Silvia, Cavani, Fabrizio, Dal Santo, Vladimiro, Dimitratos, Nikolaos, Rossi, Michele and Bianchi, Claudia L. 2011. The mechanism of surface doping in vanadyl pyrophosphate, catalyst for n-butane oxidation to maleic anhydride: The role of Au promoter. Catalysis Today 169 (1) , pp. 200-206. 10.1016/j.cattod.2010.12.050

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Abstract

This paper studies the role of Au as a promoter for vanadyl pyrophosphate, catalyst for n-butane oxidation to maleic anhydride. Samples were prepared with a stoichiometric P/V ratio (P/V = 1.0), and then doped with increasing amounts of Au. It was found that the addition of the Au promoter had a profound influence on its catalytic behaviour, as samples containing the greater amount of Au (3 wt%) showed a behaviour that was similar to that of optimal catalysts which were prepared with a slight excess of P. In fact, the presence of Au allowed all the phenomena that typically lead to the worst catalytic behaviour of stoichiometric vanadyl pyrophosphate to be minimised, i.e. both the over-oxidation of vanadium and the development of the very active but poorly selective αI-VOPO4. This was attributed to the enhanced reducibility of V5+ that was observed in Au-doped samples, as compared to the undoped ones.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Gold; Maleic anhydride; n-Butane; Selectivity; Vanadyl pyrophosphate
Publisher: Elsevier
ISSN: 0920-5861
Last Modified: 04 Jun 2017 05:44
URI: http://orca.cf.ac.uk/id/eprint/53073

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