Abstract: The kinetics of the oxidation of methanol to formaldehyde in the presence of Pb0.88 Bi0.06 La0.02 Mo/SiO2 catalyst was described by the Redox mechanism. When the particles of catalyst were increased to 3mm in diameter, the effect of intraparticle diffusion depended greatly on the oxidation rate of methanol to formaldehyde. The effectivenese factor of the catalyst was determined to be 0.28-0.12 and was interpreted with the kinetics of the Redox mechanism. The kinetic equation of the Redox mechanism in the presence of the intraparticle diffusion of methanol molecules was interpreted by the theory of diffusion and was proved experimentally. The apparent activation for the oxidation of methanol in the presence of intraparticle diffusion was determined by kinetic experiments and interpreted by a theoretical equation. The effective coefficients of intraparticle diffusion of methanol and the tortuosity factor of the catalyst were determined by kinetic experiments conducted with reaction conditions investigated.

摘要： 在30-40目的Pb_(0.88)Bi_(0.06)La_(0.02)Mo/SiO_2催化剂上甲醇氧化制甲醛的反应在动力学区域进行,其速度规律服从二步骤Redox机理动力学方程.当催化剂增大到3mm时,其动力学方程受内扩散影响严重,实验上测定了催化剂有效因子在0.28—0.12之间.作者对甲醇内扩散控制时的Redox机理动力学方程进行了理论上的推导和实验上的验证.实验上测定了受内扩散控制时的反应活化能,并从理论上指出动力学区域与内扩散区域活化能的关系.用动力学方法测定了甲醇在给定反应条件下的扩散系数和曲折因子.