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: | Research Institutes & Centres > Cardiff Catalysis Institute (CCI) Schools > 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: | 10 Aug 2023 09:47 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/101237 |
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