ZSM-5晶粒尺寸调控及其催化甲醇制烃过程积炭的形成及落位研讨  

A review on size control of ZSM-5 crystalline and the formation and location of coke on ZSM-5 during methanol to hydrocarbons conversion process

作　　者：常江伟[1] 付廷俊[1] 李忠[1] 

机构地区：[1]太原理工大学煤化工研究所,煤科学与技术教育部和山西省重点实验室,山西太原030024

出　　处：《天然气化工—C1化学与化工》2016年第1期61-67,共7页Natural Gas Chemical Industry

基　　金：太原理工大学人才资助项目(tyut-rc201454a)

摘　　要：分子筛的合成及应用一直是学术研究的热点,ZSM-5分子筛以其强酸性,有序的微孔结构成为酸催化中一种重要的催化材料。在催化甲醇转化反应中,微孔扩散限制引起的积炭是降低ZSM-5分子筛催化性能,导致其失活的主要原因。改善ZSM-5分子筛扩散性能,增强其抗积炭性能是当前研究的热点。调控ZSM-5晶粒尺寸是改善其扩散性能的重要途径之一。本文系统综述了水热合成中硅源、铝源、p H值、模板剂、老化及晶化过程等关键制备因素对ZSM-5分子筛晶粒大小的影响,获得了调控ZSM-5晶粒尺寸的关键依据,并深入就近年来ZSM-5分子筛催化甲醇制烃反应中有关积炭的形成及其落位研究进行了总结阐述,以期进一步指导ZSM-5催化剂的可控和精细合成。The synthesis and application of molecular sieves is the hot spot of academic research. ZSM-5 catalyst has received significant attention in recent years duo to its strong acidity and regular micropore structure. Abundant acidic sites located in micropores of ZSM-5 zeolites provide efficient methanol conversion performance. However, the regular micropore structure also causes diffusion limitation for large reacting molecules or coke precursors, resulting in blocking the micropores and final deactivation.Improving the coke resistence ability of ZSM-5 has been one of the topic issues. Reducing the particle size leads to a short diffusion path and a less mass transfer resistance, which results in inhibition of the formation of cokes. This review aimed at investigating the effect of different preparation parameters, such as raw materials and their ratios, p H value and the time and temperature for crystallization and aging, respectively, on the crystal size of ZSM-5, so as to obtain the key basis for the size regulation of ZSM-5crystalline. Furthermore, the researches on the formation and location of coke during the methanol-to-hydrocarbons（MTH） reaction were summarized, in order to find out efficient ways for the controlled and fine synthesis of ZSM-5 catalysts.

关 键 词：ZSM-5分子筛 粒径 水热合成 积炭 甲醇制烃反应 

分 类 号：O643[理学—物理化学] TQ426[理学—化学]