有效反应区概念在催化剂颗粒级设计中的应用

APPLICATION OF EFFECTIVE REACTION ZONE TO CATALYST PELLET DESIGN

将有效反应区概念引入催化剂颗粒级设计中,用来分析由于反应与传递交互作用所引起的一类问题——在实际体系中,催化剂颗粒内可能存在有效反应区和死区的情形。数值模拟的结果表明,在许多情况下,尤其对扩散控制的体系,催化剂颗粒内存在有效反应区和死区的情形。在这种情况下,采用不同的活性分布形式是避免死区扩大有效反应区的一个重要方法,尤其对放热反应,用适当的活性分布形式制成的催化剂有可能既满足反应器系统对颗粒尺寸的要求,又能得到很好的催化剂效率。

The effective reaction zone model of catalyst pellets is applied to describe the performance of catalyst pellet. By numerical analysis to this model, it is found that in many cases, for example, diffusion-controlled system, there may exist a dead zone in which the concentration of the reactant diffusing most slowly approaches zero and a reaction zone where the reaction actually occurs. To avoid the dead zone in catalyst pellets, the design of the catalyst pellets for a given reaction system should be properly performed. And a nonuniform actvity distribution is available in this case.