publication . Other literature type . Article . 1994

MCM-22: A Molecular Sieve with Two Independent Multidimensional Channel Systems

Stephen L. Lawton; Jeffrey A. Lawton; Mae K. Rubin; Michael E. Leonowicz;
  • Published: 24 Jun 1994
  • Publisher: American Association for the Advancement of Science (AAAS)
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 oppo...
free text keywords: Multidisciplinary, Molecular sieve, Diffraction, Crystallography, Aluminosilicate, Chemistry, Synchrotron radiation, Synchrotron, law.invention, law, Tetrahedron, Atom, Mineralogy, Crystal structure
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