甲醇制烯烃是重要的生产低碳烯烃技术,ZSM-5是MTO/MTP中常用的分子筛催化剂之一,目前众多研究者通过金属改性ZSM-5分子筛催化剂以达到提高其催化性能的目的。本文综述了近年来甲醇制烯烃技术中ZSM-5分子筛催化剂的研究应用,对ZSM-5分子筛催化剂基础性研究进行分析,从ZSM-5分子筛催化剂酸性、晶粒粒径和硅铝比之间的相互影响及对催化剂活性的影响进行了分析,总结了甲醇制低碳烯烃反应机理和催化剂积炭与失活及再生的情况。在以上基础上重点探讨了ZSM-5分子筛的金属改性,包括碱土金属、过渡金属、稀土金属、贵金属以及多组分金属改性对催化剂活性、稳定性的影响。最后,对ZSM-5分子筛催化剂用于甲醇制烯烃的发展方向做出了展望,提出以催化剂及催化剂改性的作用机理为出发点,研制出高选择性、高活性及高稳定性的分子筛催化剂仍是甲醇制烯烃技术工业应用的突破点。
Methanol to olefins(MTO)is an important technology for the production of light olefins.ZSM-5is one of the common zeolite catalysts for MTO/MTP.Many researchers have focused their work on the modification of ZSM-5catalysts to improve their activity.This review has attempted to explore the relationship between the catalytic performance and the basic-acid properties,crystalline size and Si/Al molar ratios of modified ZSM-5and to conclude the reaction scheme and the mechanism of deactivation caused by carbon deposition.Considerable efforts have been focused on reviewing the metal modifications of ZSM-5catalysts,including the impact of alkaline earth metals,transition metals,rare earth metals,noble metals and multi-component metals on the activity,selectivity and stability of the catalyst.Finally,it is concluded that the key to develop the industrial applications of MTO is to obtain catalysts with excellent catalytic activity based on the mechanism of catalysts and their modification.