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在30—40目的Mo-Bi-Ce/SiO_2催化剂上,甲醇氧化制甲醛反应在动力学区域进行时,其动力学服从Redox 机理方程。当催化剂颗粒增大至2mm 时,内扩散对甲醇氧化制甲醛的反应影响严重,催化剂的有效因子在0.47—0.85之间,从Redox 机理方程出发,对此值进行了内扩散影响的理论分析。内扩散对Redox 机理方程的反应活化能的影响服从(15)式,并从实验上得到证实。用动力学方法测定了甲醇的扩散系数。
On the 30-40 mesh Mo-Bi-Ce / SiO 2 catalyst, the kinetics of methanol oxidation to formaldehyde in the kinetic region follows the Redox mechanism. When the catalyst particle size increases to 2mm, the internal diffusion has a serious effect on the methanol oxidation to formaldehyde. The effective factor of the catalyst is between 0.47 and 0.85. Based on the Redox mechanism equation, the theoretical analysis of the effect of internal diffusion is carried out. The effect of internal diffusion on the activation energy of the reaction mechanism of Redox obeys (15) and is verified experimentally. The kinetic method was used to determine the diffusion coefficient of methanol.