Research on Co-Bi_2(MoO_4)_3 catalysts for catalytic oxidation of cyclohexane to cyclohexanone and cyclohexanol

Co-Bi_2(MoO_4)_3 were prepared by precipitation method.The properties of the catalysts were investigated using liquid-phase selective oxidation of cyclohexane as the probe reaction.The results showed that the optimum atomic ratio of the catalyst with high selectivity was n(Mo):n(Bi):n(Co)=1.5:1.0:0.2 under certain conversion.The selective oxidation of Bi_2(MoO_4)_3 was slowed down.The selectivity to cyclohexanone and cyclohexanol,meanwhile,reached 74.1% and 22.2% respectively.The main active component of the catalysts was Bi_2(MoO_4)_3 and Co-Bi_2(MoO_4)_3 had new catalytic active sites.The selectivity to cyclohexanone was enhanced obviously due to the synergistic effects of Bi,Mo and Co. Micro-structure and inherent regularity of Co-Bi_2(MoO_4)_3 were revealed by XRD and FT-IR.