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Citation: HAN Meng-meng, DAI Ji-cai, CHEN Ji-xiang. Influence of Ni crystallite size on deoxygenation of methyl laurate to hydrocarbons over Ni/SiO2 catalyst[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(8): 965-972. shu

Influence of Ni crystallite size on deoxygenation of methyl laurate to hydrocarbons over Ni/SiO2 catalyst

  • 1.

    1. Tianjin Key Laboratory of Applied Catalysis Science and Technology, Department of Catalysis Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;

  • Corresponding author: CHEN Ji-xiang, 
  • Received Date: 10 January 2014
    Available Online: 1 May 2014

    Fund Project: 国家自然科学基金(21176177) (21176177)天津市自然科学基金(12JCYBJC13200)。 (12JCYBJC13200)

  • Three Ni/SiO2 catalysts with different Ni crystallite sizes were prepared by the incipient wetness impregnation-drying-reduction and incipient wetness impregnation-drying-calcination-reduction methods. The catalysts were characterized by H2-TPR, XRD, TEM, H2 chemisorption, NH3-TPD and TGA techniques. Their catalytic performances in the deoxygenation of methyl laurate to undecane (C11) and dodecane (C12) were evaluated in a fixed bed reactor. The effects of Ni crystallite size on the catalyst structure and performance were investigated. It was found that the impregnation-drying-reduction method gave smaller Ni crystallite size, and the high reduction temperature promoted the growth of Ni crystallite. With the increase of the Ni crystallite size, the turnover frequency of methyl laurate increased, while the total selectivity to C11 and C12 (sC11+C12), C11/C12 mol ratio and the selectivity to cracking products decreased. We suggest that the deoxygenation of methyl laurate on Ni/SiO2 is structurally sensitive. The effects of weight hourly space velocity (WHSV) on performance of Ni/SiO2 were also investigated. As WHSV increased, the methyl laruate conversion, sC11+C12, C11/C12 mol ratio and the selectivity to cracking products decreased. In addition, CO and CO2 generated from the decarbonylation/decarboxylation pathway were converted to CH4, indicating that Ni/SiO2 had high activity for methanation. It was also found that the sintering of small Ni crystallites, the adsorption of organic compounds and carbon deposit led to catalyst deactivation.
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