Preparation and catalytic performance of fully crystalline MCM-22 zeolite catalyst

doi:10.16085/j.issn.1000-6613.2023-1513

Abstract

Abstract:

Fully crystalline MCM-22 zeolite catalyst was efficiently synthesized by hydrothermal crystallization method. The crystal structure, micro morphology, and acid property of the as-prepared catalyst were characterized by X-ray diffraction, scanning/transmission electron microscopy (SEM and TEM), NH₃-TPD, and so on. The catalytic performance of the as-prepared catalyst in the liquid-phase alkylation of benzene and ethylene to ethylbenzene was investigated. The results showed that the relative crystallinity of MCM-22 zeolite with ultra-thin layered structure reached 100% after 40h crystallization at 160℃. In addition, the morphology of the catalyst after crystallization remained in strip shape with 100% active component, and the mechanical strength of the catalyst was as high as 82N/cm, which fully met the requirement of industrial application. Under reaction conditions close to industrial process: temperature of 180℃, pressure of 3.5MPa, ethylene weight hourly space velocity (WHSV) of 1h^-1, molar ratio of benzene to ethylene of 2.5, the as-prepared fully crystallized MCM-22 zeolite catalyst showed good catalytic activity, selectivity, and stability. The ethylene conversion and the ethyl selectivity of the catalyst were close to 100% and 99.84%, respectively, and the content of heavy components remained about 1000μL/L within 1000h.

Key words: hydrothermal, crystallization, zeolite, catalyst, benzene

摘要：

采用水热晶化法高效合成了全结晶的MCM-22分子筛催化剂，利用X射线衍射、扫描/透射电子显微镜、NH₃-TPD等手段对催化剂的晶体结构、微观形貌、酸性质等进行了综合表征，并考察了催化剂在苯和乙烯液相烷基化制乙苯反应中的催化性能。结果表明，该全结晶MCM-22分子筛催化剂在160℃条件下40h即可完成晶化，相对结晶度达到100%。制得的分子筛为薄片层状结构，由100%活性组分组成。晶化后的催化剂成品仍维持条状形貌，机械强度达到82N/cm，满足工业应用需求。将该全结晶MCM-22分子筛催化剂应用于液相烷基化反应时，在反应温度180℃、反应压力3.5MPa、乙烯质量空速1h^-1、苯与乙烯摩尔比为2.5的条件下运行1000h，催化剂表现出良好的反应活性、选择性和稳定性，乙烯转化率接近100%，乙基选择性约99.84%，重组分含量始终维持在1000μL/L左右。

关键词: 水热, 结晶, 分子筛, 催化剂, 苯

CLC Number:

O643.36

WANG Yiyan, WANG Darui, SHEN Zhenhao, HE Junlin, SUN Hongmin, YANG Weimin. Preparation and catalytic performance of fully crystalline MCM-22 zeolite catalyst[J]. Chemical Industry and Engineering Progress, 2024, 43(1): 285-291.

王一棪, 王达锐, 沈震浩, 何俊琳, 孙洪敏, 杨为民. 全结晶MCM-22分子筛催化剂的制备及其催化性能[J]. 化工进展, 2024, 43(1): 285-291.

Figures/Tables 8

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