催化裂化催化剂颗粒形貌的表征

Characterization of Particle Morphology of FCC Catalysts

颗粒大小及形貌影响催化裂化催化剂的使用性能,客观、定量表征催化剂的颗粒形貌对催化裂化催化剂的研发、生产和使用具有重要作用。采用动态图像法对催化裂化催化剂颗粒形貌进行表征,考察了影响测量结果的样品用量、分布基准、阈值等条件,并采用形貌不同的颗粒和不同类型的样品,系统分析了采用不同模型的表征参数的表征结果。结果表明:圆润度、钝度、畸形度对形貌不同的颗粒和样品具有明显的区分度和灵敏性,可用作催化裂化催化剂颗粒形貌的表征参数;其中圆润度用于等效表征颗粒的“球形度”,钝度用于表征颗粒的耐磨程度,畸形度表征颗粒的黏连以及耐断裂与耐磨的程度。

Particle size and morphology can affect the performance of FCC catalysts.Objective and quantitative characterization of the particle morphology of catalysts is of great significance for the R&D,production and application of FCC catalyst.The particle morphology of FCC catalysts was characterized by dynamic imaging method.Factors such as sample mass,distribution benchmark and threshold affecting relevant measurement results were investigated.The characterization results of parameters from different models were systematically analyzed using particles with different morphology and various types of samples.The results show that roundness,bluntness and deformity are highly distinctive and sensitive to particles and samples with different morphologies,which can be used as characterization parameters for the particle morphology of FCC catalysts.Among them,roundness can be used to equivalently characterize the sphericity of particles,bluntness can be used to characterize the wear resistance of particles,and deformity can be used to characterize the adhesion,fracture resistance and wear resistance of particles.