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混合胺体系中MCM-49/ZSM-35复合分子筛的晶化过程
The Crystallization Process of MCM-49/ZSM-35 Composite Zeolites in a Mixed-Amine System
【摘要】 采用X射线衍射、N2吸附-脱附、扫描电镜和傅里叶变换红外光谱等技术,研究了MCM-49/ZSM-35复合分子筛在Na2O-SiO2-Al2O3-CHA(环己胺)-HMI(六亚甲基亚胺)-H2O合成体系中,先在低温80°C老化4h,再经160°C晶化不同时间的演变过程.结果表明,在该混合胺体系中,首先生成MCM-49分子筛,随着晶化时间的延长,形成ZSM-35含量逐渐增加的MCM-49/ZSM-35复合分子筛,最后生成纯ZSM-35分子筛;ZSM-35的生成是以MCM-49分子筛的消耗为代价的.
【Abstract】 The crystallization process of MCM-49/ZSM-35 composite zeolites in the Na2O-SiO2-Al2O3-CHA (cyclohexamine)-HMI (hexamethyleneimine)-H2O system was investigated by X-ray diffraction,N2 adsorption,scanning electron microscopy,and Fourier transform infrared spectroscopy.The results showed that in the HMI-CHA system,pure phase MCM-49 was obtained first,then MCM-49/ZSM-35 composite zeolites were gradually formed with increasing ZSM-35 content upon the crystallization time,and finally pure phase ZSM-35 was produced.Moreover,the formation of ZSM-35 zeolite was based on the consumption of MCM-49 zeolite in this mixed-amine system.
【Key words】 MCM-49; ZSM-35; composite zeolite; synthesis; crystallization process; cyclohexamine; hexamethyleneimine;
- 【文献出处】 催化学报 ,Chinese Journal of Catalysis , 编辑部邮箱 ,2010年08期
- 【分类号】O643.32
- 【被引频次】6
- 【下载频次】268