A301氨合成催化剂工程参数研究与测定III. 曲折因子的测定

采用动态法 ,在单颗粒线反应器中对 A30 1氨合成催化剂的曲折因子进行了测定。由自行开发的计算机采样系统自动分析脉冲 -应答曲线 ,通过参数估值得到颗粒内的有效扩散系数 ,从而得出催化剂的曲折因子。经测定 ,A30 1催化剂的曲折因子为 3.2 8。

Study on Engineering Parameters of A301 Ammonia Synthesis Catalyst III. Determination of the Tortuosity Factor

The tortuosity factor is an important parameter of the catalyst and it has an effect on the global reaction rate of gassolid catalytic reaction, the capacity of the reactor and the efficiency of the catalyst etc.. The tortuosity factor of A301 ammonia synthesis catalyst is measured using dynamic state methodsingle pellet string reactor method (SPSRM). More than 50 particles of A301 catalyst reduced are packed one by one in a chromatography column. The trace gas is injected into the column. The adsorption, desorption and diffusion occur in the catalyst. The pulseanswer curves are autoanalyzed by online computer system so that the first absolute and the second central moments are attainable. The parameter estimation method is applied to get the effective diffusion coefficient from the experimental data, so that the tortuosity factor can be obtained. The tortuosity factor of A301 catalyst is 3.28.