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Hydrotreatment of jatropha oil over CoMoS/γ-Al_2O_3 catalyst

TIAN Wei-qian,LIU Jing,LIU Can,FAN Kai,RONG Long(School of Biological Science and Medical Engineering,Beihang University,Beijing 100191,China)  
CoMoS/γ-Al2O3 catalysts were prepared by ex-situ presulfiding method using ammonium thiosulfate as a sulfiding agent and characterized by XRD,N2 physisorption,NH3-TPD and XRF techniques.The catalytic performances were tested by hydrotreatment of jatropha oil in a fixed-bed reactor.The effects of sulfidity,reaction temperature,hydrogen pressure and reaction time on catalyst activity and catalytic product distributions were investigated.Reaction pathways for the hydrotreatment of jatropha oil were also discussed.The results showed that the CoMoS1/γ-Al2O3 catalyst with a sulfidity of 1 had the best hydrotreatment activity,showing 96.3% conversion of jatropha oil and 75.6% yield to the main components of C15~18 n-alkanes at temperature 360 ℃ and hydrogen pressure 3 MPa.Its conversion was 36.9% higher than that of the non-sulfided CoMo/γ-Al2O3 catalyst at the same reaction conditions.It is worth noticing that both of the conversion of jatropha oil and the total oxygen-free compound of products could achieve 100% over CoMoS1/γ-Al2O3 at 420 ℃,3 MPa.With the increase of sulfidity and reaction temperature or the decrease of hydrogen pressure,the hydrodecarboxylation and hydrodecarbonylation were enhanced.
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