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生物乙醇近年来得到蓬勃发展,由乙醇制备低碳烯烃得到广泛关注。本文综述了近年来在乙醇制低碳烯烃领域ZSM-5催化剂的研究进展,介绍了经过金属或磷改性后的催化剂能够改善催化剂的性能,表现为降低催化剂表面酸量,调节酸强度,抑制芳构化和氢转移反应的发生。与未改性分子筛催化剂相比,改性后的催化剂能够显著提高催化剂的活性和乙醇转化产物中低碳烯烃的选择性,同时延长了催化剂的使用寿命。讨论了影响反应的一些因素和该反应的可能机理;展望了催化剂在乙醇制低碳烯烃中的发展方向,指出由乙醇制低碳烯烃是传统石脑油裂解的一条可替代途径。
Bioethanol has been booming in recent years, from ethanol production of light olefins have received widespread attention. In this paper, the progress of ZSM-5 catalyst in the field of ethanol-made light olefins was reviewed. The catalysts modified by metal or phosphorus were introduced to improve the performance of the catalyst. The performance of the catalyst was to reduce the surface acidity, adjust the acid strength, Aromatization and the occurrence of hydrogen transfer reactions. Compared with the unmodified molecular sieve catalyst, the modified catalyst can significantly improve the activity of the catalyst and the selectivity of light olefins in the ethanol conversion product, and prolong the service life of the catalyst. Some factors influencing the reaction and the possible mechanism of the reaction were discussed. The development direction of the catalysts in the ethanol-producing olefins was prospected. It was pointed out that the ethanol-made olefins were an alternative route to the traditional naphtha cracking.