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Pyridine-H5PMo10V2O40 hybrid catalysts for liquid-phase hydroxylation of benzene to phenol with molecular oxygen

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Abstract

Pyridine(Py)-modified Keggin-type vanadium-substituted heteropoly acids (Py n PMo10V2O40, n=1 to 5) were prepared by a precipitation method as organic/inorganic hybrid catalysts for direct hydroxylation of benzene to phenol in a pressured batch reactor and their structures were detected by FT-IR. Among various catalysts, Py3PMo10V2O40 exhibits the highest catalytic activity (yield of phenol, 11.5%), without observing the formation of catechol, hydroquinone and benzoquinone in the reaction with 80 vol% aqueous acetic acid, molecular oxygen and ascorbic acid used as the solvent, oxidant and reducing reagent, respectively. Influences of reaction temperature, reaction time, oxygen pressure, amount of ascorbic acid and catalyst on yield of phenol were investigated to obtain the optimal reaction conditions for phenol formation. Pyridine can greatly promote the catalytic activity of the Py-free catalyst (H5PMo10V2O40), mostly because the organic π electrons in the hybrid catalyst may extend their conjugation to the inorganic framework of heteropoly acid and dramatically modify the redox properties, at the same time, pyridine adsorbed on heteropoly acids can promote the effect of “pseudo-liquid phase”, thus accounting for the enhancement of phenol yield.

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Authors and Affiliations

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing, 210009, China

    HanQing Ge, Yan Leng, FuMin Zhang, ChangJiang Zhou & Jun Wang

  2. Petrochemical Research Institute, PetroChina Company Ltd., Beijing, 100083, China

    JiaRui Piao

Authors
  1. HanQing Ge
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  2. Yan Leng
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  3. FuMin Zhang
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  4. JiaRui Piao
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  5. ChangJiang Zhou
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  6. Jun Wang
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Correspondence to Jun Wang.

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Supported by the National Natural Science Foundation of China (Grant Nos. 20476046 and 20776069) and the “Qinglan” Project of Jiangsu Province for Young Researchers

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Ge, H., Leng, Y., Zhang, F. et al. Pyridine-H5PMo10V2O40 hybrid catalysts for liquid-phase hydroxylation of benzene to phenol with molecular oxygen. Sci. China Ser. B-Chem. 52, 1264–1269 (2009). https://doi.org/10.1007/s11426-009-0055-6

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  • DOI: https://doi.org/10.1007/s11426-009-0055-6

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