烯烃裂解中分子筛催化剂的稳定性研究进展

低碳烯烃催化裂解增产丙烯是一项新技术,高水热稳定催化剂的研究和开发是关键技术之一,硅酸铝分子筛催化剂因具有相对较好的稳定性而得到了广泛研究. 本文总结了HY, HZSM-5和 MCM-22等微孔、介孔以及具有微-介孔复合结构的新型分子筛在烯烃催化裂解反应中的稳定性,特别是水热稳定性方面的研究进展,归纳了提高酸性分子筛催化剂水热稳定性的方法,比较了不同方法制得分子筛的催化裂解性能,对高稳定性催化剂在实际应用中的问题和前景进行了探讨,为研发新一代低碳烯烃裂解催化剂提供参考.

Advances in Research of the Stability of Molecular Sieve Catalysts for Olefin Cracking

Due to the greatly increasing demand of propene,the catalytic cracking of mixed C4 olefins or other less valuable feedstock appears to be very attractive for industry.Much effort has been made on developing new catalysts with excellent hydrothermal stability for the application at high temperatures with steam.Aluminosilicate molecular sieves are potential catalysts for their specific pore structure and acidity.Microporous zeolites(such as HY,HZSM-5,MCM-22,etc),mesoporous molecular sieves,and molecular sieves with microporous and mesoporous structure have been used for the cracking.This paper reviewed the research progress of olefin cracking on zeolite catalysts and the improvement of hydrothermal stability of the zeolites.The advances in zeolite modification and its influence on performance of catalytic cracking of olefins were summarized.It would be valuable for the development of effective and applicable catalysts for the cracking of less valuable hydrocarbon feedstock to propene.