CATALYST FOR COUPLING FCC AND AROMATIZATION TO PRODUCE HIGH QUALITY GASOLINE

Olefins in FCC naphtha and LPG were converted to aromatics by using a catalyst containing NiO/HZSM-5 additive. Thus, the olefin content of FCC naphtha reduced with minimum octane loss. The performance of the catalysts with different dosages of NiO/HZSM-5 additive was studied, and comparison of catalysts with other additives, such as CoAPO-11 and APO-11/HZSM-5 complex, was conducted. The test results indicated that NiO/HZSM-5 additive was the best one for enhancing aromatization reactions in FCC process; at an additive adding dosage of 5% the olefin content of FCC naphtha decreased by 5.8 percentages and aromatics content increased by 9.7 percentages. The mechanism of coupling catalytic cracking reactions and aromatization reactions was briefly discussed.