MCM-22 - A MOLECULAR-SIEVE WITH 2 INDEPENDENT MULTIDIMENSIONAL CHANNEL SYSTEMS
MCM-22 - A MOLECULAR-SIEVE WITH 2 INDEPENDENT MULTIDIMENSIONAL CHANNEL SYSTEMS
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DOI：
10.1126/science.264.5167.1910
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发表时间：
1994-06-24
期刊：
影响因子：
56.9
通讯作者：
RUBIN, MK
中科院分区：
文献类型：
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作者：
LEONOWICZ, ME;LAWTON, JA;RUBIN, MK
分子筛MCM-22含有以前在这类材料中未观察到的结构特征。它的骨架拓扑结构，从高分辨率电子显微照片，并与同步加速器X射线衍射粉末数据细化，包含两个独立的孔系统，这两个都是通过环组成的10个四面体（T）原子（如Si，Al，和B）访问。这些孔隙系统之一是由二维正弦通道定义的。另一个由大的超笼组成，其内部自由直径为7.1埃，由12个T-O物种（12环）定义，其内部高度为18.2埃。这些共存的孔隙系统可以为石油化工和炼油工业中的各种催化应用提供机会。另一个结构特征是一个不寻常的-T-O-T-链，它穿过改性的十二烷基-1H [4（3）5（6）6（3）]笼的中心。
The molecular sieve MCM-22 contains structural features previously unobserved in this class of materials. Its framework topology, derived from high-resolution electron micrographs and refined with synchrotron x-ray diffraction powder data, contains two independent pore systems, both of which are accessed through rings composed of ten tetrahedral (T) atoms (such as Si, Al, and B). One of these pore systems is defined by two-dimensional, sinusoidal channels. The other consists of large supercages whose inner free diameter, 7.1 angstroms, is defined by 12 T-O species (12-rings) and whose inner height is 18.2 angstroms. These coexisting pore systems may provide opportunities for a wide variety of catalytic applications in the petrochemical and refining industries. Another structural feature is an unusual-T-O-T-chain that passes through the center of a modified dodecasil-1H [4(3)5(6)6(3)] cage.