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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.
The reaction of methanol oxidation to formaldehyde on the Pb_ (0.88) Bi_ (0.06) La_ (0.02) Mo / SiO_2 catalyst with 30-40 meshes was carried out in the kinetic region and its velocity follows the two-step Redox kinetic equation. As the catalyst increases To 3mm, the kinetic equation is seriously affected by internal diffusion, and the effective factor of the catalyst is determined experimentally between 0.28 and 0.12. The author deduces and experimentally deduces the kinetic equation of Redox mechanism in the diffusion control of methanol The activation energy of the reaction was controlled experimentally and the relationship between the kinetic energy and the activation energy in the inner diffusion zone was theoretically pointed out.The kinetic method was used to determine the diffusion coefficient of methanol under the given reaction conditions And tortuosity factor.