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Catalytic partial oxidation of cyclohexane by bimetallic Ag/Pd nanoparticles on magnesium oxide

Liu, Xi, Conte, Marco, He, Qian ORCID:, Knight, David W., Murphy, Damien M. ORCID:, Taylor, Stuart H. ORCID:, Whiston, Keith, Kiely, Christopher J. ORCID: and Hutchings, Graham J. ORCID: 2017. Catalytic partial oxidation of cyclohexane by bimetallic Ag/Pd nanoparticles on magnesium oxide. Chemistry - A European Journal 23 (49) 10.1002/chem.201605941

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The liquid-phase oxidation of cyclohexane to cyclohexanol and cyclohexanone was investigated by synthesizing and testing an array of heterogeneous catalysts comprising: monometallic Ag/MgO, monometallic Pd/MgO and a set of bimetallic AgPd/MgO catalysts. Interestingly, Ag/MgO was capable of a conversion comparable to current industrial routes of approximately 5 %, and with a high selectivity (up to 60 %) to cyclohexanol, thus making Ag/MgO an attractive system for the synthesis of intermediates for the manufacture of nylon fibres. Furthermore, following the doping of Ag nanoparticles with Pd, the conversion increased up to 10 % whilst simultaneously preserving a high selectivity to the alcohol. Scanning transmission electron microscopy and energy dispersive spectroscopy of the catalysts showed a systematic particle-size-composition variation with the smaller Ag–Pd nanoparticles being statistically richer in Pd. Analysis of the reaction mixture by electron paramagnetic resonance (EPR) spectroscopy coupled with the spin-trapping technique showed the presence of large amounts of alkoxy radicals, thus providing insights for a possible reaction mechanism.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Uncontrolled Keywords: cyclohexane oxidation; silver palladium catalysts
Publisher: Wiley
ISSN: 0947-6539
Date of First Compliant Deposit: 16 March 2017
Date of Acceptance: 7 March 2017
Last Modified: 28 Nov 2023 22:07

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