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Preparation, characterization, and catalytic performances of a pyrazine dicarboxylate-bridging rare-earth-containing polytungstoarsenate aggregate for selective oxidation of thiophenes and deep desulfurization of model fuels

Abstract

A new polytungstoarsenate: K6LiH6[Ce4(H2O)14(pzdc)(H2pzdc)As3W29O103]•22H2O (1) (H2pzdc = 2,3-pyrazinedicarboxylic acid) is synthesized through conventional aqueous solution method. In this synthetic approach, organic ligand pyrazine dicarboxylate acid was induced into the arsenotungstates system. The synthesized compound 1 was well characterized by elemental analysis, IR spectroscopy, UV-vis spectroscopy, thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction. The catalytic activity of compound 1 was tested in acetonitrile to oxidize organosulfur compounds (benzothiophene (BT) and dibenzothiophene (DBT)) by hydrogen peroxide as an oxidant, at room temperature. Two subtrates were oxidized to their corresponding sulfones with high conversion and selectivity. Taking advantage of this remarkable catalytic move, the 1/H2O2/CH3CN system was further utilized in the oxidation of model fuels (MF) including a mixture of BT and DBT in octane. As a result, the organosulfur compounds in the model fuels were fully converted into their corresponding sulfones. What’s more, the fluorescence properties of 1 have also been investigated.

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Publication details

The article was received on 30 Mar 2018, accepted on 14 Jun 2018 and first published on 15 Jun 2018


Article type: Paper
DOI: 10.1039/C8DT01243A
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Preparation, characterization, and catalytic performances of a pyrazine dicarboxylate-bridging rare-earth-containing polytungstoarsenate aggregate for selective oxidation of thiophenes and deep desulfurization of model fuels

    Y. Niu, Q. Xu, Y. Wang, Z. Li, J. Lu, P. Ma, C. Zhang, J. Niu and J. Wang, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT01243A

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