Abstract: The high accessibility Y zeolite with an abundant mesoporous structure and strong B acid activity were designed according to the reaction features of hydrotreated light circulating oil (LCO). The resulting Y zeolite has an improved ring-opening ability. Combined with the matrix with heavy oil pre cracking capacity and strong carbon tolerance, a special catalytic cracking catalyst SLG-1 for processing hydrotreated LCO was developed. The industrial application results showed that the yield of LPG is reduced by 1.58 percentage points, the gasoline yield increases by 4 percentage points, and the total liquid yield improves by 2.17 percentage points.

Key words: LTAG, catalyst, hydrotreated LCO, FCC