Abstract: In order to solve the problem of the high iron content of long-term catalysts in the heavy oil catalytic cracking unit of SINOPEC Hainan Refining and Chemical Co.,Ltd., the distribution and migration of iron in the high iron-containing equilibrium catalyst were studied by means of SEM-EDS and EPMA. It was found that the iron in the equilibrium catalyst could migrate between particles, which could provide a guidance for the design and development of iron-resistant catalysts. The typical iron poisoning phenomenon in FCC unit was summarized, which was mainly manifested in the increase of secondary dilute phase density, the increase of slurry yield, and the decrease of ABD and pore volume. The new anti-iron catalyst CMT-1HN designed and developed by SINOPEC Research Institute of Petroleum Processing was industrially applied in Hainan Refining and Chemical Co.,Ltd. The application results showed that the fluidization in the unit was normal under the condition that the iron content of the equilibrium catalyst maintained 8 000-10 000 μg/g for a long time, and the heavy oil conversion was good, which indicated that the CMT-1HN catalyst had excellent performance of anti-iron contamination.

Key words: fluid catalytic cracking, Iron contamination, catalyst