Abstract: A heavy oil catalytic cracking catalyst M with low coke and high LPG selectivity was developed by using high activity ultrastable molecular sieve and new shape selective technology and applied in the RFCC unit of a petrochemical company. The application results showed that compared with the blank calibration, when the raw materials and operating conditions were roughly the same and the catalyst M accounted for 80% of the system reserves, the processing load of the device increased by 5%, the yield of liquefied gas and the total liquid yield increased by 1.72 and 0.18 percentage points, respectively, the gasoline yield and diesel yield decreased by 1.23 and 0.21 percentage points, respectively, the oil slurry and coke yield decreased by 0.14 and 0.16 percentage points, respectively, and the dry gas yield remained basically unchanged. The new developed catalyst M showed a strong bottom oil conversion ability and excellent coke selectivity and could convert a large number of gasoline molecules into LPG without decreasing the total liquid yield and can meet the LPG demand of the plant.

Key words: heavy oil catalytic cracking, highly active ultrastable molecular sieve, new shape selection, LPG, heavy oil, coke