Abstract：To investigate the behaviors of fluid catalytic cracking (FCC) catalyst under high temperature, the impact of time and jet velocity on the attrition rate of FCC catalyst (CGP-I) in a fixed fluidized bed were studied at 500 ℃ and 600 ℃. The attrition mechanism of catalyst was also investigated based on particle morphology and attrition dynamics. The results showed that attrition speed was decreased with the increase of attrition time; attrition rate was increased with the increase of temperature and jet velocity. Based on experiment results and Gwyn’s model, a macro-dynamics balance equation was established and an exponentially increasing attrition rate with attrition time and jet velocity was observed. The attrition process can be considered as a first-order irreversible process and the catalyst attrition behavior is influenced by abrasion mechanism mostly under high temperature.
