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Oxidation of cinnamyl alcohol using bimetallic Au-Pd/TiO2catalysts: a deactivation study in a continuous flow packed bed microreactor

Wu, Gaowei, Brett, Gemma Louise, Cao, Enhong, Constantinou, Achilleaa, Ellis, Peter, Kuhn, Simon, Hutchings, Graham John, Bethell, Donald and Gavriilidis, Asterios 2016. Oxidation of cinnamyl alcohol using bimetallic Au-Pd/TiO2catalysts: a deactivation study in a continuous flow packed bed microreactor. Catalysis Science & Technology 6 (13) , pp. 4749-4758. 10.1039/C6CY00232C

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Abstract

The stability of a bimetallic Au–Pd/TiO2 catalyst was examined in a packed bed microreactor for the oxidation of cinnamyl alcohol dissolved in toluene. The catalyst was prepared by co-impregnation with a Au–Pd weight ratio of 1 : 19. Experiments were performed at 80–120 °C, oxygen concentration 0–100% and total pressure 4 bara. Principal products observed were cinnamaldehyde, 3-phenyl-1-propanol and trans-β-methylstyrene. Although the same catalyst was shown to possess good stability in the oxidation of benzyl alcohol, it deactivated during the oxidation of cinnamyl alcohol, particularly at elevated reaction temperatures. Higher concentration of oxygen used for the reaction led to improved cinnamaldehyde selectivity but lower conversion and higher deactivation rates. Treatment with hydrogen recovered only a fraction of the activity. Deactivation was attributed to Pd leaching and a complex effect of oxygen.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Subjects: Q Science > QD Chemistry
Publisher: Royal Society of Chemistry
ISSN: 2044-4753
Funders: EPSRC
Date of First Compliant Deposit: 4 August 2016
Date of Acceptance: 17 May 2016
Last Modified: 04 Jun 2017 09:20
URI: http://orca.cf.ac.uk/id/eprint/93604

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