Deactivation Behavior of Supported Gold Palladium Nanoalloy Catalysts during the Selective Oxidation of Benzyl Alcohol in a Micropacked Bed Reactor


Al-Rifai, Noor, Miedziak, Peter J, Morad, Moataz, Sankar, Meenakshisundaram, Waldron, Conor, Cattaneo, Stefano, Cao, Enhong, Pattisson, Samuel, Morgan, David, Bethell, Donald ORCID: 0000-0002-7320-7585 et al (show 2 more authors) (2017) Deactivation Behavior of Supported Gold Palladium Nanoalloy Catalysts during the Selective Oxidation of Benzyl Alcohol in a Micropacked Bed Reactor INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 56 (45). pp. 12985-12994. ISSN 0888-5885, 1520-5045

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Abstract

Highly active, supported Au-Pd catalysts have been tested for catalyzing benzyl alcohol oxidation in a silicon-glass micropacked 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. While 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 >10 nm particles. A secondary deactivation mechanism characterized by the formation of an amorphous surface film was observed via transmission electron microscopy in catalysts with high Cl- and Au and was associated with the detection of carbon species on the catalyst surface using Raman spectroscopy.

Item Type: Article
Uncontrolled Keywords: 3403 Macromolecular and Materials Chemistry, 34 Chemical Sciences, 3406 Physical Chemistry, 40 Engineering, 4018 Nanotechnology, Substance Misuse, Nanotechnology, Bioengineering, Alcoholism, Alcohol Use and Health
Depositing User: Symplectic Admin
Date Deposited: 30 Jan 2020 14:22
Last Modified: 16 Jun 2026 04:54
DOI: 10.1021/acs.iecr.7b01159
Open Access URL: https://pubs.acs.org/doi/10.1021/acs.iecr.7b01159
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3072708
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