Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Effective Liquid-phase Nitration of Benzene Catalyzed by a Stable Solid Acid Catalyst: Silica Supported Cs2.5H0.5PMo12O40

  • Gong, Shu-Wen (Shandong Provincial Key Laboratory of Chemical Energy-Storge and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University) ;
  • Liu, Li-Jun (Shandong Provincial Key Laboratory of Chemical Energy-Storge and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University) ;
  • Zhang, Qian (Shandong Provincial Key Laboratory of Chemical Energy-Storge and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University) ;
  • Wang, Liang-Yin (Shandong Provincial Key Laboratory of Chemical Energy-Storge and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University)
  • Received : 2011.12.08
  • Accepted : 2012.01.26
  • Published : 2012.04.20
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Abstract

Silica supported $Cs_{2.5}H_{0.5}PMo_{12}O_{40}$ catalyst was prepared through sol-gel method with ethyl silicate-40 as silicon resource and characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy, nitrogen adsorption-desorption and potentiometric titration methods. The $Cs_{2.5}H_{0.5}PMo_{12}O_{40}$ particles with Keggin-type structure well dispersed on the surface of silica, and the catalyst exhibited high surface area and acidity. The catalytic performance of the catalysts for benzene liquid-phase nitration was examined with 65% nitric acid as nitrating agent, and the effects of various parameters were tested, which including temperature, time and amount of catalyst, reactants ratio, especially the recycle of catalyst was emphasized. Benzene was effectively nitrated to mononitro-benzene with high conversion (95%) in optimized conditions. Most importantly, the supported catalyst was proved has excellent stability in the nitration progress, and there were no any other organic solvent and sulfuric acid were used in the reaction system, so the liquid-phase nitration of benzene that we developed was an eco-friendly and attractive alternative for the commercial technology.

Keywords

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