An unsupported cobalt molybdenum sulfide catalyst was prepared using ammonium heptamolybdate, cobalt nitrate and elemental sulfur under reflux in ammonium hydroxide. The crystal structure of the precursor was identified using XRD and was determined to be CoMoO4 mixed with elemental sulfur. The refluxed samples were decomposed in a tube furnace at 450°C under a 10% H2:90% Ar. The decomposed precursor was characterized using XRD and the LeBail fitting procedure, which confirmed sample was a biphasic mixture Co9S8MoS2. The synthesized sample was tested in the hydrodesulphurization of dibenzothiophene at 350°C. The removal of the dibenzothiophene was found to follow pseudo zeroth order and had a catalytic activity of 2.44 x10-6 mol g-1 s-1 (or 24.4 x 10-7 mol g-1 s-1). After 5 hours of reaction the catalyst showed approximately 95% conversion of the dibenzothiophene. The primary product of the hydrodesulphurization of the dibenzothiophene was biphenyl which was approximately 80% of the products and the minor product was cyclohexyl-benzene at approximately 13%.

Catalytic removal of eibenzothiophene using CoMoS2 synthesized using elemental sulfur

253rd National Meeting (2017)

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