Ultrastable organofunctional microporous to mesoporous silica compositions
AssigneeBoard of Trustees of Michigan State University
InventorsThomas J. Pinnavaia, Yutaka Mori
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Abstract
Mesostructured and microporous to mesoporous organofunctionalized silica compositions are described. The compositions incorporate the organofunctional group L as part of a LSiO3 unit in the framework of the compositions. In addition the compositions incorporate the organofunctional group R as part of a O3Si—R—siO3 unit in the framework of the compositions. The compositions are useful as molecular sieves, supports for catalysts and numerous other applications requiring an organo group on surfaces of a silica.
Claims7
A mesostructured, microporous to mesoporous organofunctional silica composition as a spherical particle or a thin film wherein a framework for the composition is comprised of at least two units selected from the group consisting of LSiO3,SiO4, and O3Si—R—SiO3 linked through bridging Si—O—Si bonds, wherein L is an organofunctional group bonded to one silicon atom through a silicon-carbon covalent bond, R is an organo group linked to two silicon centers through silicon-carbon covalent bonds;
- wherein at least 80% of the silicon atoms in the LSiO3 and O3Si—R—SiO3 units are crosslinked through bridging oxygen atoms to three other silicon atoms in the framework;
- and wherein the composition exhibits at least one x-ray diffraction line corresponding to a lattice spacing between about 1.8 nm and 10 nm.
Dependencies are inferred from the claim text.