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Hierarchical flower-like hollow alumina supported bimetallic AuPd nanoparticle catalyst for the enhanced solvent-free ethylbenzene oxidation

Abstract

Currently, oxidation of alkylaromatics is considered as one of the most crucial chemical technologies to produce high added-value alcohols, ketones and carboxylic acids, due to its significant importance both in fine synthetic chemistry and in academic field. In this work, a novel hierarchical marigold-like hollow alumina supported bimetallic AuPd nanoparticle catalyst was successfully fabricated and employed for highly efficient solvent–free ethylbenzene oxidation to produce acetophenone in the coexistence of both molecular oxygen and tert-butyl hydroperoxide as the oxidant and the initiator. As-fabricated bimetallic AuPd nanocatalyst afforded a superior catalytic performance to corresponding monometallic counterparts and commercial Al2O3 or solid Al2O3 microsphere supported AuPd ones, along with a high acetophenone selectivity of 88.2 % at the conversion of 50.9 % under mild reaction conditions (120 oC and oxygen pressure of 1.0 MPa), as well as an unprecedentedly high turnover frequency value of 46768 h-1. Such exceptional efficiency of the catalyst was related to both the significant synergy between Au-Pd atoms and strong metal-support interactions, as well as the unique hierarchical micro/nanostructure of the support being beneficial to close contact of reactants with surface adsorption and reaction sites and easy product diffusion. Moreover, the present bimetallic AuPd catalyst was recyclable and stable. The developed approach is expected to offer exciting opportunities for designing other supported monometallic or bimetallic catalysts with various active components applied in heterogeneous catalysis.

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Publication details

The article was received on 27 Mar 2018, accepted on 09 May 2018 and first published on 15 May 2018


Article type: Paper
DOI: 10.1039/C8DT01182F
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Hierarchical flower-like hollow alumina supported bimetallic AuPd nanoparticle catalyst for the enhanced solvent-free ethylbenzene oxidation

    H. Dong, R. Xie, L. Yang and F. Li, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT01182F

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