Title: Molecular engineering of porous silica using aryl templates

Abstract

A process for manipulating the porosity of silica using a series of organic template groups covalently incorporated into the silicate matrix. The templates in the bridged polysilsesquioxanes are selectively removed from the material by oxidation with oxygen plasma or other means, leaving engineered voids or pores. The size of these pores is dependent upon the length or size of the template or spacer. The size of the templates is measured in terms of Si-Si distances which range from about 0.67 nm to 1.08 nm. Changes introduced by the loss of the templates result in a narrow range of micropores (i.e. <2 nm). Both aryl and alkyl template groups are used as spacers. Novel microporous silica materials useful as molecular seives, dessicants, and catalyst supports are produced.

Inventors:

Loy, Douglas A ^[1]; Shea, Kenneth J ^[2]

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1. Albuquerque, NM
2. Irvine, CA

Issue Date:

Sat Jan 01 00:00:00 EST 1994

Research Org.:

AT&T

OSTI Identifier:

869355

Patent Number(s):

5321102

Assignee:

United States of America as represented by Department of Energy (Washington, DC)

Patent Classifications (CPCs):

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

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B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

B01J20/103 - {comprising silica}
B01J20/283 - based on silica
B01J20/3057 - {Use of a templating or imprinting material
B01J21/08 - Silica
B01J2220/54 - Sorbents specially adapted for analytical or investigative chromatography
B01J31/127 - {the siloxane units, e.g. silsesquioxane units, being grafted onto other polymers or inorganic supports, e.g. via an organic linker}
B01J35/1019 - {100-500 m2/g}
B01J35/1057 - {less than 2 nm}
B01J37/086 - {Decomposition of an organometallic compound, a metal complex or a metal salt of a carboxylic acid}

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

C01B33/12 - Silica
C01B37/02 - Crystalline silica-polymorphs, e.g. silicalites {dealuminated aluminosilicate zeolites}

C - CHEMISTRY C08 - ORGANIC MACROMOLECULAR COMPOUNDS C08G - MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

C08G77/52 - containing aromatic rings

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DOE Contract Number:  

AC04-76DP00789

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

molecular; engineering; porous; silica; aryl; templates; process; manipulating; porosity; series; organic; template; covalently; incorporated; silicate; matrix; bridged; polysilsesquioxanes; selectively; removed; material; oxidation; oxygen; plasma; means; leaving; engineered; voids; pores; size; dependent; length; spacer; measured; terms; si-si; distances; range; 67; nm; 08; changes; introduced; loss; result; narrow; micropores; alkyl; spacers; novel; microporous; materials; useful; seives; dessicants; catalyst; supports; produced; porous silica; catalyst support; selectively removed; materials useful; oxygen plasma; selectively remove; narrow range; catalyst supports; organic template; silicate matrix; /525/528/