关键词: 催化裂化, 催化剂, 汽油料, 硫, 分子筛

Abstract: DOS series FCC catalysts was developed for reducing sulfur content of FCC naphtha during bottoms cracking. The preparation of DOS catalyst involved a new Lewis acid-alkali compound and modified Y zeolite. The catalytic performance of the catalyst was evaluated by MAT, ACE device and fixed-fluidized bed unit. The test results showed that the Lewis acid-alkali compound could enhance the transferring of large sulfur compounds from FCC naphtha, and the optimum coordination of zeolite with said component could keep the contents of olefin and sulfur in naphtha low. Results also showed that the heavy oil yield was lower; the catalyst was more tolerance to metal contamination, and the sulfur content in naphtha reduced by 20% as compared with a commercial catalyst for reducing olefin content of naphtha.

Key words: Catalytic Cracking, Catalyst, gasoline stock, sulfur, molecular sieve