Abstract:

Light olefins such as ethylene and propylene are the most important basic raw materials in the chemical industry. In recent years, the global demand for light olefins has continued to increase, and the development of technology to increase the production of light olefins through catalytic cracking of different raw materials will remain the main direction. In this work, we focus on the efficient production of light olefins by catalytic cracking process and the research progress in the preparation and catalytic cracking performance of zeolite catalysts, especially in the synthesis and performance modulation mainly based on ZSM-5 zeolites is reviewed. For the increase of production of light olefins, ZSM-5 zeolites by using diversified synthesis method are provided, its modulation of texture and acid properties of ZSM-5 zeolites by modification with different elements, preparation of hierarchical porous structures are introduced, and the effects on feedstock conversion, light olefins selectivity and catalyst stability are emphatically discussed. The structure-activity relationship of catalytic cracking over the ZSM-5 catalysts to increase the production of light olefins is summarized and elucidated. Finally, the new ways for improving the regulation of light olefin distribution by precisely regulating ZSM-5 zeolites is further prospected, which lays the foundation for designing key catalysts for catalytic cracking hydrocarbons to produce light olefins.

Key words: molecular sieves, ZSM-5, catalysis, performance regulation, selectivity, light olefin

摘要：

乙烯、丙烯等低碳烯烃是化学工业重要的基础原料。近年来，全球低碳烯烃的需求量持续增加，发展不同原料催化裂解增产低碳烯烃的技术仍将是主流方向。围绕催化裂解高效制备低碳烯烃工艺，阐述了分子筛催化剂制备及其催化裂解性能的研究进展，尤其是基于ZSM-5分子筛综述了催化裂解催化剂的研制及性能调控的研究进展，包括用于增产低碳烯烃的ZSM-5分子筛的高效合成及结构形貌控制，探讨了通过元素改性、多级孔结构制备对ZSM-5分子筛的织构性质、酸性质的调变，分析总结了其对原料转化率、低碳烯烃选择性和催化剂稳定性的影响，阐明了不同微观结构性质的ZSM-5分子筛催化剂上催化裂解增产低碳烯烃的构效关系，为精准调控ZSM-5分子筛的结构性质研究提供新思路，为设计烃类催化裂解制低碳烯烃工艺关键催化剂奠定基础。

关键词: 分子筛, ZSM-5, 催化, 性能调控, 选择性, 低碳烯烃