Abstract：The age probability density exponential function of equilibrium catalyst in commercial fluid catalytic cracking(FCC) unit was determined and the uniform metal contamination mechanism or non-uniform metal contamination mechanism was proposed based on the distribution of activity intensity of catalyst. The model equations of equilibrium catalyst activity or micro-reaction activity affected by metal contamination from V, Ni, Fe and Na were determined through the derivation of catalyst deactivation kinetics. The parameters of catalyst deactivation kinetics were obtained by the data of industrial equilibrium catalyst activity. The results showed that the model with the non-uniform metal contamination mechanism had higher calculation precision, and the deposited metal first contaminated the strong activity sites, then the weak ones. The effect of V deposition on catalyst activity was the biggest and the effect of Na was the smallest, while the effect of Ni and Fe was medium. The model prediction results showed that the activity or micro-reaction activity of equilibrium catalyst obviously decreased along with the increase of the V, Ni, Fe deposition and slightly decreased with the increase of the Na deposition.
Ren Jie,Dai Yue,Yuan Haikuan et al. Models of Deactivation Kinetics and Equilibrium Activity of Catalytic Cracking Catalyst Contaminated by Metals[J]. 化学反应工程与工艺, 2015, 31(4): 315-321.
