甲醇直接气相羰基化反应动力学

甲醇直接气相羰基化研究 ,是在无任何促进剂下 ,ＣＯ与甲醇直接进行羰基化反应 ,这与目前公认的甲醇必须有碘化物作用下构成催化循环的间接羰化不同 ,在催化理论上有可能提出新的羰基化机理。彭峰等在甲醇直接气相羰基化方面 ,对具有高活性与选择性的非铑非卤素Ｍｏ Ｃ催化剂体系进行了系列研究 ,并取得了较好的实验结果1～ 5] 。有碘甲烷参与的甲醇羰基化液相或者气相反应 ,大多数文献认为控制步骤是碘化物中Ｃ -Ｉ键的解离及ＣＯ的插入 ,羰基化反应是由一系列平行和连串反应组成的6～ 8] 。催化剂类型不同得到的动力学参数也不相同 ,难…

KINETICS OF DIRECT VAPOR-PHASE CARBONYLATION OF METHANOL

A novel heterogeneous sulfided Mo/C catalyst was used for the direct vapor phase carbonylation of methanol Experiments were designed with the elimination of mass transfer resistances to obtain data The data of primary reactions in the carbonylation were collected via a differential tubular reactor Feed composition was varied to examine the effect of partial pressures of reactants on the reaction rate Power law rate models were employed to express the conversion of methanol and the formations of methyl acetate and methane Adequate results were obtained with the models to represent the experimental data The reaction orders of methyl acetate formation with respect to methanol and CO were found to be 1 2 and 0 35 respectively on the novel Mo/C catalyst, and the reaction activation energy was 106?kJ/mol At the same time, the reaction mechanism of direct vapor phase carbonylation of methanol was presented The initial step of this reaction was suggested to be the cleavage of methanol to form CH 3 M, followed by adsorbed CO insertion into the metal methyl bond to form CH 3C(O) M, which further interacts with methanol to form methyl acetate