PT  - JOURNAL ARTICLE
AU  - Leonowicz, Michael E.
AU  - Lawton, Jeffrey A.
AU  - Lawton, Stephen L.
AU  - Rubin, Mae K.
TI  - MCM-22: A Molecular Sieve with Two Independent Multidimensional Channel Systems
AID  - 10.1126/science.264.5167.1910
DP  - 1994 Jun 24
TA  - Science
PG  - 1910--1913
VI  - 264
IP  - 5167
4099  - http://science.sciencemag.org/content/264/5167/1910.short
4100  - http://science.sciencemag.org/content/264/5167/1910.full
SO  - Science1994 Jun 24; 264
AB  - 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 [435663] cage.