Abstract: IM-5 molecular sieve possesses 3D medium pore structure with certain amount of mesoporous, strong acidity and higher ratio of B acid and can be used as a component of FCC catalyst. The experiments indicate that the catalyst with IM-5 sieve can improve the conversion and the low olefin yield. The results of ACE evaluation of catalytic cracking with HVGO as feedstock show that the conversion of HVGO increases by 4.5 percent points, and that the LPG yield is 5% more than that of the catalyst without IM-5. The yield of light cycle oil, slurry and coke each decreases 1%. Thus IM-5 is a mesoporous molecular sieve with industrial application prospect.

Key words: IM-5, catalytic cracking, medium pore size sieve, polific LPG