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首页> 外文期刊>Microporous and mesoporous materials: The offical journal of the International Zeolite Association >Synthesis of mesoporous MOR materials by varying temperature crystallizations and combining ternary organic templates
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Synthesis of mesoporous MOR materials by varying temperature crystallizations and combining ternary organic templates

机译：通过改变温度结晶并结合三元有机模板合成介孔MOR材料

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An approach, which involved perturbations of synthesis conditions in crystallization temperature and organic template composition, has been proposed for derivation of mesopores from bulk structural defects formed in mordenite (MOR) phases, based on the character of intrinsic crystal defects and ten-sional distortions of two compressed 8-membered rings in MOR framework. Consequently, hierarchically porous materials with MOR structures were prepared by varying temperature synthesis and using ternary organic micelles templates. The synthesized materials were characterized by powder X-ray diffraction, nitrogen adsorption at 77 K and transmission electron microscopy. These crystalline materials combined the advantages of both mordenites with the micropore system and mesoporous materials by featuring an additional intracrystalline mesopore system in MOR single crystals, resulting in a hierarchical pore distribution in range of 1.7-80.0 nm together with the significant specific surface areas. In particular, individual crystal morphologies of typical mesoporous MOR materials showed the defect-rich structures responding essentially to the mesoporosity; the mesoporous materials were substantiated matchable well to normal mordenites in acid capacity and acid strength distribution. Furthermore, several factors acting on intracrystalline mesopore formation were elucidated for explicating the perturbation synthesis approach, and whole reaction routes for synthesizing different solid products under related crystallization conditions were summarized coupling with a demonstration of part TEM micrographs. The overall results suggested that the investigative approach of perturbation imposed on crystal growth provides an alternative route for direct hydrothermal synthesis of mesoporous zeolite materials and implied that bulk structural defects within single crystals lead to the formation of intracrystalline mesopores in various sizes.
机译：已经提出了一种方法，该方法涉及晶化温度和有机模板成分的合成条件的扰动，基于内在晶体缺陷和晶体的十维畸变的特征，从丝光沸石（MOR）相形成的整体结构缺陷中衍生出中孔。 MOR框架中的两个压缩的8元环。因此，通过改变温度合成并使用三元有机胶束模板来制备具有MOR结构的分层多孔材料。通过粉末X射线衍射，77 K下的氮吸附和透射电子显微镜对合成的材料进行表征。这些结晶材料通过在MOR单晶中具有额外的结晶内介孔系统，将丝光沸石与微孔系统和介孔材料的优点结合在一起，从而在1.7-80.0 nm范围内形成了分级的孔分布以及显着的比表面积。特别地，典型的介孔MOR材料的单个晶体形态显示出富缺陷的结构，其基本上响应于介孔率。介孔材料在酸容量和酸强度分布方面与普通丝光沸石的匹配性良好。此外，阐明了影响晶体内中孔形成的几种因素，以阐明扰动合成方法，并总结了在相关结晶条件下合成不同固体产物的整个反应路线，并结合了部分TEM显微照片的演示。总体结果表明，对晶体生长施加扰动的研究方法为直接水热合成介孔沸石材料提供了另一种途径，并暗示单晶内的大量结构缺陷导致形成各种尺寸的晶体内介孔。

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