When intra-particle diffusionlimitation is important, the use of non-cylindrical catalysts can increase superficial reaction rate markedly.
对于颗粒内扩散控制的催化反应过程，采用异形催化剂可以显著提高表观反应速度；
2
The reduction activity of nitrate and the formation of ammonium are mainly controlled by the diffusionlimitation and the mass transfer of the reactants.
同时，催化剂的活性和选择性受到扩散限制和质量传输的影响。
3
The lung function damage is limitation ventilation dysfunction and diffusion dysfunction.