Abstract: Octane number promoters were modified by the addition of gallium and phosphorus through impregnation. The catalyst was characterized by a series of analysis methods, and the performance of the catalyst was evaluated by a fixed fluidized bed reactor. The effects of gallium and phosphorus on the physical and chemical properties of the catalysts and on the selectivity of gasoline aromatics were investigated. The results showed that the aromatization ability of the catalyst modified with gallium could be improved and the octane number of gasoline could be increased. After the gallium modified catalyst was reintroduced with phosphorus, phosphorus interacts with gallium, which weakens the aromatization ability of the catalyst,but the increase of B acid center is beneficial to the increase of the selectivity of low-carbon olefins.

Key words: gallium, gasoline, aromatics, phosphorus, catalytic cracking, catalyst, octane number