The analysis of the effectiveness factor in catalytic particles with non-uniform size, was performed. The procedure proposed by Weisz and Prater to determine the intrinsic kinetic constants from experimental results was extended to cases where the catalyst particle size distribution is considered. The approach was applied to the study of reactions with power law and Langmuir-Hinshelwood-Hougen-Watson type kinetics, the catalyst particles being spheres with volume log-normal size distribution (typical in, e.g., fluid catalytic cracking catalysts). If the catalytic effectiveness factor is calculated assuming uniform particle size R_m (R_m being the volume to area mean radius), it will be always higher than the actual effectiveness factor. If the particle size distribution is not taken into account during the assessment of the intrinsic kinetic constants by means of the Weisz and Prater method, the values of those constants will be erroneous. The higher the dispersion in the particles size distribution, the higher the error in ignoring the impact of the different sizes.

进行了尺寸不均匀的催化颗粒的有效因子分析。Weisz和Prater提出的从实验结果确定内在动力学常数的程序已扩展到考虑了催化剂粒度分布的情况。该方法被用于研究具有幂律和Langmuir-Hinshelwood-Hougen-Watson型动力学的反应，催化剂颗粒是具有体积对数正态尺寸分布的球（通常在例如流化催化裂化催化剂中使用）。如果假定颗粒大小R _m（R _m（体积与面积的平均半径），它将始终高于实际效果因子。如果在通过Weisz和Prater方法评估固有动力学常数的过程中未考虑粒度分布，则这些常数的值将是错误的。粒度分布中的分散度越高，忽略不同粒度影响的误差就越大。