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多相催化反应的发生有如下几步:(1)反应物由气流向催化剂颗粒外表面及产物由颗粒外表面向气流的扩散(外部扩散);(2)反应物自颗粒表面向孔隙内部表面的扩散及产物由孔隙内部向颗粒表面的扩散(内部扩散);(3)反应物的吸附和产物的脱吸;(4)表面反应。总反应速度由速度最慢的步骤控制,由此而区分为外扩散控制、内扩散控制与动力学控制,或者是处于
The heterogeneous catalytic reaction occurs in the following steps: (1) diffusion of the reactant from the gas flow to the outer surface of the catalyst particles and the diffusion of the product from the outer surface of the particle to the gas flow (external diffusion); (2) reaction of the reactant from the particle surface to the inner surface of the pore Diffusion and product diffusion from the interior of the pores to the surface of the particles (internal diffusion); (3) Adsorption of reactants and desorption of products; (4) Surface reactions. The total reaction rate is controlled by the slowest step, which distinguishes between out-diffusion control, in-diffusion control and kinetic control, or at