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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 ORCID: https://orcid.org/0000-0002-7105-0203, Waldron, Conor, Cattaneo, Stefano, Cao, Enhong, Pattisson, Samuel, Morgan, David ORCID: https://orcid.org/0000-0002-6571-5731, Bethell, Donald, Hutchings, Graham John ORCID: https://orcid.org/0000-0001-8885-1560 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: 02 Nov 2022 11:13
URI: https://orca.cardiff.ac.uk/id/eprint/101237

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