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Deactivation behaviour of supported gold palladium nanoalloy catalysts during the selective oxidation of benzyl alcohol in a micro-packed bed reactor

Al-Rifai, Noor, Miedziak, Peter John, Morad, Moataz, Meenakshisundaram, Sankar, Waldron, Conor, Cattaneo, Stefano, Cao, Enhong, Pattisson, Samuel, Morgan, David, Bethell, Donald, Hutchings, Graham John and Gavriilidis, Asterios 2017. Deactivation behaviour of supported gold palladium nanoalloy catalysts during the selective oxidation of benzyl alcohol in a micro-packed bed reactor. Industrial & Engineering Chemistry Research 56 (45) , pp. 12984-12993. 10.1021/acs.iecr.7b01159

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Abstract

Highly active, supported Au-Pd catalysts have been tested for catalysing benzyl alcohol oxidation in a silicon-glass micro-packed bed reactor. The effects of Au-Pd composition and anion content during catalyst preparation on catalyst deactivation were studied, and a relationship between the deactivation rate and the amount of Cl- and Au used in the catalyst formulation was found. Whilst Au aids in enhancing the selectivity to the desired product and the Cl- ions help the formation of uniform 1-2 nm nanoparticles, higher amounts of Au and Cl- become detrimental to the catalyst stability once a certain amount is exceeded. Loss of small (1-2 nm) metal nanoparticles was evident in all catalysts studied, accompanied by agglomeration and the formation of larger >10nm particles. A secondary deactivation mechanism characterised by the formation of an amorphous surface film was observed via TEM in catalysts with high Cl- and Au and was confirmed by the detection of carbon species on the catalyst surface using Raman Spectroscopy.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Publisher: American Chemical Society
ISSN: 0888-5885
Funders: EPSRC
Date of First Compliant Deposit: 7 June 2017
Date of Acceptance: 26 May 2017
Last Modified: 30 Jan 2018 20:41
URI: http://orca.cf.ac.uk/id/eprint/101237

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