晶种和CTA协同辅助合成多级孔ZSM-5分子筛及其催化性能

摘要/Abstract

摘要： 采用质量分数1.5%（相对于硅源）的晶种溶液，结合不同含量的十六烷基三甲基溴化铵（CTA）成功合成了多级孔ZSM-5分子筛。采用X射线粉末衍射、扫描电子显微镜、低温N₂吸附-脱附和傅里叶变换红外光谱技术表征了其物理化学性质,发现CTA含量对多级孔ZSM-5分子筛合成有显著影响，CTA起到了填充骨架、平衡电荷和介孔模板的作用，而晶种溶液主要起结构导向作用。以C₈芳烃转化作为探针反应对合成的多级孔ZSM-5分子筛催化剂的催化性能进行评价，结果表明晶种和CTA协同辅助合成的多级孔ZSM-5分子筛催化剂上乙苯和间二甲苯转化率优于单一晶种溶液辅助合成的样品。

关键词: 分子筛, 晶种, 模板剂, C₈芳烃转化

Abstract: Both seed and CTA serve as common template agents in the synthesis of hierarchical ZSM-5 zeolites. However, their specific roles in the synthesis process remain unclear. The hierarchicalZSM-5 zeolites were successfully synthesized by using a 1.5% of seed solution and various CTA contents. The physical and chemical properties of the synthesized zeolites were characterized using X-ray powder diffraction, scanning electron microscopy, low-temperature N₂ adsorption-desorption, and Fourier-transform infrared techniques. The investigation revealed that the CTA content exerted a significant influence on the synthesis of ZSM-5 zeolites, with CTA contributing to framework filling, charge balancing, and acting as a mesoporous template, while the seed solution primarily served as a structure-directing agent. Furthermore, through the utilization of the conversion of C₈ aromatic hydrocarbons as a probe reaction, it was demonstrated that the catalyst containing hierarchical ZSM-5 zeolites synthezed by seeds and CTA exhibited enhanced conversion rates for ethylbenzene and m-xylene compared to samples synthesized exclusively with a seed solution.

Key words: zeolite, seed, template agent, C₈ aromatics conversion

丁云龙张燕挺宋金锐侯楠李晓峰. 晶种和CTA协同辅助合成多级孔ZSM-5分子筛及其催化性能[J]. 石油炼制与化工, 2025, 56(6): 50-57.

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