DOI: 10.1126/science.264.5167.1910. MCM-22: A Molecular Sieve with Two Independent Multidimensional Channel Systems

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

10.1126/science.264.5167.1910

Crossref journal-article

American Association for the Advancement of Science (AAAS)

Science (221)

Abstract

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.

Bibliography

Leonowicz, M. E., Lawton, J. A., Lawton, S. L., & Rubin, M. K. (1994). MCM-22: A Molecular Sieve with Two Independent Multidimensional Channel Systems. Science, 264(5167), 1910â1913.

Authors 4

Michael E. Leonowicz (first)
Jeffrey A. Lawton (additional)
Stephen L. Lawton (additional)
Mae K. Rubin (additional)

References 12 Referenced 804

Rubin M. K. U.S. Patent 4 954 325 (1990). (10.2307/3146733)
Baerlocher C. DLS-76: A Program for the Simulation of Crystal Structures by Geometric Refinement (1978).
BENNETT, J.M., THE STRUCTURE OF AS-SYNTHESIZED ALPO4-16 DETERMINED BY A NEW FRAMEWORK MODELING METHOD AND RIETVELD REFINEMENT OF SYNCHROTRON POWDER DIFFRACTION DATA, ZEOLITES 11: 502 (1991). (10.1016/S0144-2449(05)80125-3) / ZEOLITES (1991)
GERKE, H, STUDIES ON CLATHRASILS .4. CRYSTAL-STRUCTURE OF DODECASIL-1H, A SYNTHETIC CLATHRATE COMPOUND OF SILICA, ZEITSCHRIFT FUR KRISTALLOGRAPHIE 166: 11 (1984). / ZEITSCHRIFT FUR KRISTALLOGRAPHIE (1984)
GRAMLICHMEIER, R, ANCIENT ORIENTAL PATTERN AND RELATED ZEOLITE TYPE NETWORKS, ZEITSCHRIFT FUR KRISTALLOGRAPHIE 177: 237 (1986). (10.1524/zkri.1986.177.3-4.237) / ZEITSCHRIFT FUR KRISTALLOGRAPHIE (1986)
Hahn T. Space-Group Symmetry: (1983).
KELLER, E. B., SOLID STATE IONICS 43: 93 (1990). (10.1016/0167-2738(90)90475-7) / SOLID STATE IONICS (1990)
Larson A. C. GSAS Generalized Structure Analysis System (1988).
LAWTON, S.L., THE FRAMEWORK TOPOLOGY OF ZSM-18, A NOVEL ZEOLITE CONTAINING RINGS OF 3 (SI,AL)-O SPECIES, SCIENCE 247: 1319 (1990). (10.1126/science.247.4948.1319) / SCIENCE (1990)
MCCUSKER, L. B., JOURNAL OF APPLIED CRYSTALLOGRAPHY 21: 305 (1988). (10.1107/S0021889888002092) / JOURNAL OF APPLIED CRYSTALLOGRAPHY (1988)
RIETVELD, H.M., A PROFILE REFINEMENT METHOD FOR NUCLEAR AND MAGNETIC STRUCTURES, JOURNAL OF APPLIED CRYSTALLOGRAPHY 2: 65 (1969). (10.1107/S0021889869006558) / JOURNAL OF APPLIED CRYSTALLOGRAPHY (1969)
SMITH D. K. POWD10 (1983). (10.2307/1444355)

Dates

Type	When
Created	18 years, 10 months ago (Oct. 5, 2006, 8:01 p.m.)
Deposited	7 months, 2 weeks ago (Jan. 11, 2025, 3:39 a.m.)
Indexed	1 day, 15 hours ago (Aug. 23, 2025, 9:37 p.m.)
Issued	31 years, 2 months ago (June 24, 1994)
Published	31 years, 2 months ago (June 24, 1994)
Published Print	31 years, 2 months ago (June 24, 1994)

Funders 0

None

BibTeX

@article{Leonowicz_1994, title={MCM-22: A Molecular Sieve with Two Independent Multidimensional Channel Systems}, volume={264}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.264.5167.1910}, DOI={10.1126/science.264.5167.1910}, number={5167}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Leonowicz, Michael E. and Lawton, Jeffrey A. and Lawton, Stephen L. and Rubin, Mae K.}, year={1994}, month=jun, pages={1910–1913} }

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