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通过一系列应答实验,证实了氧在MoO_3-V_2O_3催化剂上的吸附和吸附态氧转变为晶格氧的过程是慢过程,是乙烷氧化脱氢反应的速度控制步骤;乙烯的深度氧化是乙烯与催化剂表面上吸附态氧作用的结果,而不是与催化剂上晶格氧作用的结果。结合第Ⅰ部分的实验结果,提出了乙烷氧化脱氢制乙烯反应的机理,并用Treanor法和DPP法求取了各基元步骤的速率常数、活化能和指前因子等动力学参数。用计算所得的结果进行拟合,其结果与实验曲线吻合。
Through a series of response experiments, it was confirmed that oxygen is adsorbed on the MoO 3 -V 2 O 3 catalyst and the transition from oxygen to lattice oxygen is a slow process, which is a rate controlling step for the oxidative dehydrogenation of ethane. The deep oxidation of ethylene is ethylene As a result of the action of the adsorbed oxygen on the surface of the catalyst and not as a result of the lattice oxygen on the catalyst. Combined with the experimental results of the first part, the mechanism of ethylene oxidation by ethane oxidation and dehydrogenation was proposed. The kinetic parameters such as rate constant, activation energy and pre-exponential factor were calculated by Treanor method and DPP method. The calculated results were used for fitting, and the results were in good agreement with the experimental curves.