在气-固异相催化反应过程中,总涉及到催化剂外部的传递过程——反应物从气相向催化剂外表面扩散,产物从催化剂外表面向气相扩散,同时伴随有热量传递。由于外部传递阻力的存在,导致催化剂外表面与流动相(气相)间的温度差和浓度差;这种外部温度差和浓度差直接影响到反应速度和选 During the gas-solid heterogeneous catalytic reaction, the external transfer of the catalyst is involved. The reactant diffuses from the gas phase to the outer surface of the catalyst, and the product diffuses from the outer surface of the catalyst to the gas phase, accompanied by heat transfer. Due to the existence of external transfer resistance, the temperature difference and concentration difference between the catalyst surface and the mobile phase (gas phase) are caused. This external temperature difference and concentration difference directly affect the reaction rate and selectivity