催化裂化与芳构化反应耦合多产优质汽油催化剂的研究

CATALYST FOR COUPLING FCC AND AROMATIZATION TO PRODUCE HIGH QUALITY GASOLINE

以NiO/HZSM-5为增强芳构化助剂,通过催化裂化与芳构化反应耦合,使催化裂化汽油和裂化气中的部分烯烃转化为芳烃,以降低汽油馏分中的烯烃含量,改善催化裂化汽油的组成。考察了助剂添加量对催化裂化催化剂降烯烃性能的影响,并与以CoAPO-11分子筛和HZSM-5与APO-11复合分子筛为助剂的催化裂化催化剂进行了对比。结果表明,NiO/HZSM-5的芳构化降烯烃效果最好,当添加量为5%时,汽油馏分中烯烃含量降低了5.8个百分点,而芳烃含量提高了9.7个百分点。并对催化裂化与芳构化反应耦合的机理进行了初步探讨。

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.