Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (11): 1301-1306.DOI: 10.11944/j.issn.1000-0518.2017.11.170011

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Preparation of High Activity Oxidative DesulfurizationCatalyst with Polycation and Heteropolyanion Keggin Structure

CHEN Lidonga*(),TONG Huana,WANG Xuyanga,SONG Pengyuea,LIU Dia,JI Yanqinga,YUE Qiana,DING Weia,JIA Yixina,CHEN Yongyingb,JIANG Chunjiea*()   

  1. aSchool of Chemistry and Chemical Engineering,Liaoning Normal University,Dalian,Liaoning 110629,China
    bSchool of Chemistry Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China
  • Received:2017-01-06 Accepted:2017-04-14 Published:2017-11-08 Online:2017-11-08
  • Contact: CHEN Lidong,JIANG Chunjie
  • Supported by:
    Supported by the Research Fund for the Doctoral Program of Liaoning Province of China(No.20131060)

Abstract:

Design and development of high activity ultra-deep oxidation of desulfurization catalyst is one of the most important ways to meet the increasing stringent requirements of petrochemical industry for cleaning fuel standards in the future. Catalysts with Keggin structure aluminum hydroxide polyoxocations(Al13), Al13-SDS and HPW-Al13-SDS(HPW=Keggin structure phosphotungstic acid, SDS=sodium dodecylsulfate) were prepared. The structures of these catalysts were characterized by Fourier transform infrared spectroscopy(FT-IR), X-ray diffraction(XRD), ultraviolet visible spectroscopy(UV-Vis), Brunauer-Emmett-Teller(BET) and thermogravimetry(TG). The preservation of the Keggin structure on HPW-Al13-SDS catalyst was confirmed by IR and UV-Vis spectra. Catalytic oxidation desulfurization(ODS) reaction over HPW-Al13-SDS with a model of oil(n-hexan solution of organic sulfur) was studied. In optimized condition, up to 99.5% conversion of sulfur was achieved. The efficiencies of ODS decrease from dibenzothiophene to benzothiophene. IR and XRD characterizations of HPW-Al13-SDS catalyst after the reaction show that the catalysts form peroxo-tungsten complexes. The catalytic activity of the recycled HPW-Al13-SDS is almost the same as freshly prepared, and can be recycled via easy separation. The catalyst used herein is an ideal model for ODS of organic sulfide.

Key words: phosphotungstic acid, aluminum hydroxide polyoxocations, oxidative desulfurization, organic sulfide, hydrogen peroxide