ZSM-5催化乙醇制低碳烯烃*

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。

Conversion of Ethanol into Light Olefins over ZSM-5 Catalysts

The conversion of ethanol to light olefins has been attracted more attentions since the bioethanol got much developed in recent years. This paper reviewed the advancement of HZSM-5 catalyst for the reaction. The HZSM-5 catalysts modified with metal ion or phosphorus improved the catalytic performance compared to the unmodified catalysts. The loaded components on HZSM-5 decreased the amount of B acid and changed the intensity, the activity of catalysts and selectivity of light olefins were remarkably enhanced by the modification, and the service life was also prolonged. The factors for the reaction and the possible reaction mechanism, were also discussed in the paper. It was pointed out that the production of olefins via ethanol is an alternative route for cracking naphtha. Contents
1 Introduction
2 ZSM-5 catalysts for convention ethanol to light olefins
2.1 Metal modified catalysts
2.2 Phosphorus modified catalysts
2.3 Other catalysts
3 Factors for reaction of ethanol to light olefins
4 Reaction mechanisms of ethanol to light olefins
5 Outlook