Abstract: The catalytic cracking experiments of hydrotreated LCO (HLCO) were conducted in an ACE unit for Y zeolite, active meso-pore material and zeolites withβor MFI structure. The conversions of the components in the feed and the influence of conditions on the cracking reaction were investigated. The results show that the higher gasoline and C6-C9 aromatics yields are obtained by catalysts containing Y type zeolite with higher gasoline octane, but aromatics with double ring and multi-ring are generated simultaneously during the reaction process, which offset part of the benefit of hydrotreating process. The reaction temperature and catalyst to oil ratio has less influence on the HLCO conversion; the increase of reaction temperature has negative impact on gasoline yield, while catalyst to oil ratio has weak influence on it. The high reaction temperature promotes the generation of heavy product, but high catalyst to oil ratio is just opposite. The increase of both reaction temperature and catalyst to oil ratio raise the aromatics content of gasoline.

Key words: hydrotreated LCO, catalytic cracking, catalyst, Y type zeolite