Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Direct Synthesis of H2O2 over Ti-Containing Molecular Sieves Supported Gold Catalysts: A Comparative Study for In-situ-H2O2-ODS of Fuel

  • Zhang, Han (Department of Chemistry, College of Science, Northeast Forestry University) ;
  • Liu, Guangliang (Departments of Chemical & Biomolecular Engineering, Center for Clean Energy Engineering, University of Connecticut) ;
  • Song, Haiyan (Department of Chemistry, College of Science, Northeast Forestry University) ;
  • Chen, Chunxia (Department of Chemistry, College of Science, Northeast Forestry University) ;
  • Han, Fuqin (Department of Chemistry, College of Science, Northeast Forestry University) ;
  • Chen, Ping (Key Laboratory of Pollution Monitoring and Control, Xinjiang Normal University) ;
  • Zhao, Zhixi (Key Laboratory of Pollution Monitoring and Control, Xinjiang Normal University) ;
  • Hu, Shaozheng (Institute of Eco-environmental Sciences, Liaoning Shihua University)
  • Received : 2013.06.13
  • Accepted : 2013.07.25
  • Published : 2013.10.20
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Abstract

Direct synthesis of $H_2O_2$ and in situ oxidative desulfurization of model fuel over Au/Ti-HMS and Au/TS-1 catalysts has been comparatively investigated in water or methanol. Maximum amount (82%) of active $Au^0$ species for $H_2O_2$ synthesis was obtained. Au/Ti-HMS and Au/TS-1 exhibited the contrary performances in $H_2O_2$ synthesis as $CH_3OH/H_2O$ ratio of solvent changed. $H_2O_2$ decomposition and hydrogenation in water was inhibited by the introduction of methanol. Effect of $O_2/H_2$ ratio on $H_2O_2$ concentration, $H_2$ conversion and $H_2O_2$ selectivity revealed a relationship between $H_2O_2$ generation and $H_2$ consumption. The highest dibenzothiophene removal rate (83.2%) was obtained over Au/Ti-HMS in methanol at 1.5 of $O_2/H_2$ ratio and $60^{\circ}C$. But removal of thiophene over Au/TS-1 should be performed in water without heating to obtain a high removal rate (61.3%). Meanwhile, $H_2$ conversion and oxidative desulfurization selectivity of $H_2$ were presented.

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References

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