Bulk crystal seeding in the generation of mesopores by organosilane surfactants in zeolite synthesis
Bulk crystal seeding in the generation of mesopores by organosilane surfactants in zeolite synthesis
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DOI：
10.1039/c4ta01948b
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发表时间：
2014-08-14
影响因子：
11.9
通讯作者：
Ryoo, Ryong
中科院分区：
文献类型：
--
作者：
Kim, Jaeheon;Jo, Changbum;Ryoo, Ryong
除了添加有机硅烷表面活性剂作为中孔生成剂外，通常使用Na+或有机结构导向剂合成MOR、CHA和FAU-X拓扑结构的沸石。有机硅烷由结构式(CH3O)(3)Si-C3H6-N+(CH3)(2)CnH2n+1表示，其中n从12变化到16和18。合成结果表明，大块沸石晶种从沸石产物中完全消失，说明它们解体成了高分辨电子显微镜无法检测到的微小碎片。然而，沸石晶种的加入大大缩短了合成时间。更重要的是，与非晶种合成相比，晶种合成在将有机硅烷导向的介孔生成策略扩展到广泛的介孔和沸石结构方面是非常有效的。
Zeolites of MOR, CHA, and FAU-X topologies were conventionally synthesized using Na+ or an organic structure-directing agent, except that organosilane surfactants were added as a mesopore-generating agent. The organosilanes were represented by the structural formula (CH3O)(3)Si-C3H6-N+(CH3)(2)CnH2n+1, where n was varied from 12 to 16 and 18. Each zeolite synthesis was seeded with a small amount of bulk zeolites of the same structure type. The synthesis result indicated that the bulk zeolite seeds disappeared completely from the zeolite products, indicating their disintegration into tiny fragments that were undetectable by high-resolution transmission electron microscopy. Nevertheless, the zeolite seeding caused a dramatic decrease in synthesis time. More importantly, crystal seeding, in comparison to unseeded synthesis, was highly effective in extending the organosilane-directed mesopore-generating strategy to a wide range of mesoporous and zeolite structures.