Co-Bi_2(MoO_4)_3应用于环己烷催化氧化制环己酮和环己醇

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

采用沉淀法合成了Co-Bi_2(MoO_4)_3催化剂,以环己烷的液相选择性氧化为探针反应评价催化剂的性能,结果表明,金属原子数的最佳配比为n(Mo)∶n(Bi)∶n(Co)=1.5∶1.0∶0.2,在一定转化率前提下,有效减缓Bi_2(MoO_4)_3氧化性的同时,环己酮和环己醇选择性分别达到74.1%和22.2%。铋钼催化剂的主要活性组分为Bi_2(MoO_4)_3,少量Co^(2+)对其改性,催化剂产生了新的活性中心,环己酮的选择性明显增加,Bi、Mo和Co之间存在协同作用。XRD和FT-IR从不同侧面揭示了Co-Bi_2(MoO_4)_3的微观结构和内在规律性。

Co-Bi2 （MoO4） 3 were prepared by precipitation method. The properties of the catalysts were investigated using liquid-phase selective that the optimum atomic ratio of the oxidation of cyclohexane as the probe reaction. The results showed catalyst with high selectivity was n （no） ： n （Bi） ： n （Co） = 1.5： 1.0：0.2 under certain conversion. The selective oxidation of cyclohexanone and cyclohexanol, meanwhile, reached Bi2 （MoO4）3 was slowed down. The selectivity to 74.1% and 22.2% respectively. The main active component of the catalysts was Bi2 （MoO4）3 and Co-Bi2 （MoO4）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-Bi2 （MoO4）3 were revealed by XRD and Ft-IR.