Synthesis and characterization of MCM-49/ZSM-35 composite zeolites in the hexamethyleneimine and cyclohexamine system
Synthesis and characterization of MCM-49/ZSM-35 composite zeolites in the hexamethyleneimine and cyclohexamine system
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DOI：
10.1016/j.micromeso.2009.01.027
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发表时间：
2009-05
影响因子：
5.2
通讯作者：
Sujuan Xie;Shenglin Liu;Y. Liu;Xiujie Li;Weiping Zhang;Longya Xu
中科院分区：
文献类型：
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作者：
Sujuan Xie;Shenglin Liu;Y. Liu;Xiujie Li;Weiping Zhang;Longya Xu
以六亚甲基亚胺（HMI）和环六胺（CHA）为原料，采用混合胺体系合成了不同组成的MCM-49/ZSM-35复合分子筛。在同一体系中，通过调节合成条件，可以成功地合成出MCM-49和ZSM-35分子筛。特别是在CHA/HMI摩尔比、Na 2 O/Al 2 O3摩尔比和晶化时间较长的条件下，可以制备出ZSM-35分子筛含量较高的MCM-49/ZSM-35复合材料。采用X射线衍射、N2吸附等温线、NH3-TPD、扫描电镜和HP-129核磁共振技术对MCM-49/ZSM-35复合分子筛的结构、酸分布和形貌进行了表征。这些表征结果表明，MCM-49/ZSM-35复合分子筛的孔结构与机械混合的分子筛有明显的不同。
A novel route for synthesis of MCM-49/ZSM-35 composite zeolites with different compositions in a mixed amine system containing hexamethyleneimine (HMI) and cyclohexamine (CHA) has been developed. Furthermore, both MCM-49 zeolite and ZSM-35 zeolite can be successfully synthesized by adjusting the synthesis conditions in the same system. Especially, the MCM-49/ZSM-35 composites with more content of ZSM-35 zeolite can be produced under conditions of larger CHA/HMI molar ratio, higher Na2O/Al2O3molar ratio and longer crystallization time. The structure characterization, acid distribution and morphology of the MCM-49/ZSM-35 composite zeolites are characterized by X-ray diffraction, N2adsorption isotherms, NH3-TPD, scanning electron microscopy as well as HP-129Xe NMR technology. These characterizations give obvious different pore structure of the MCM-49/ZSM-35 composite zeolites from the mechanical mixing counterpart.