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Citation: LIU Lai-shuan, PEI Tian-jie, AN Wen-ping, LI Yu, LI Nan. Effect of the chelating agent on the hydrodesulfurization activity of extruded Co-Mo/Al2O3 catalysts[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(6): 738-742. shu

Effect of the chelating agent on the hydrodesulfurization activity of extruded Co-Mo/Al2O3 catalysts

  • 1.

    School of Chemical Engineering and Environment, North University of China, Taiyuan 030051, China

  • Corresponding author: LIU Lai-shuan, 
  • Received Date: 5 December 2013
    Available Online: 19 March 2014

    Fund Project: 山西省科技重大专项(20111101013) (20111101013)山西省自然科学基金(2009011011-4)。 (2009011011-4)

  • γ-Al2O3 monolith support with high surface area and wide pore size distribution was obtained by extruding the mixture of pseudo boehmite and organic additives, as well as subsequent drying and calculation; a series of Co-Mo catalysts with ca. 8% molybdenum and 2% cobalt were prepared through co-impregnation of the support with solutions of ammonium heptamolybdate, cobalt nitrate and the chelating agent of citric acid (CA), oxalic acid (OA) and ethylenediamine tetraacetic acid (EDTA). The Co-Mo/Al2O3 catalysts were characterized by nitrogen sorption, XRD and H2-TPR; the effect of chelating agents on their textural properties and activity in hydrodesulphurisation (HDS) of a commercial crude benzol was investigated. The results indicated that the catalyst precursors were mostly deposited over the surface of the mesopores with a diameter between 3 and 10 nm; the addition of chelating agent results in a high dispersion of Co-Mo species on the alumina support. The H2-TPR results revealed that the addition of CA is able to improve the catalyst reducibility and shift the reduction temperature of Mo6+ to lower temperature. For the HDS reaction of the real-feedstock in a down-flow tubular reactor under 300 ℃, 3.0 MPa, a liquid hourly space velocity (LHSV) of 2 h-1, and a hydrogen/oil volume ratio of 600, the removal of thiophene sulfur reaches 99.9% over the CA-promoted Co-Mo/Al2O3 catalyst.
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