Combined porous organic and inorganic oxide materials prepared by non-ionic surfactant templating route
AssigneeBoard of Trustees of Michigan State University
InventorsThomas J. Pinnavaia, Louis Mercier
Life of this patent
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Abstract
A method for preparing synthetic, semi-crystalline, porous inorganic oxide composition containing a reactive organic silane moiety which is on the surface of pore walls. The composition is prepared from a poly(oxyalkylene) based surfactant and a hydrolyzable organic silane. The surfactant is preferably a poly(ethylene) oxide, a poly(propylene) oxide polymer or mixtures thereof. The organic silane is preferably mercaptopropylsilane. The compositions are particularly useful as adsorbents, and catalysts.
Claims16
A method for the preparation of a porous synthetic, semi-crystalline hybrid organic-inorganic silicon oxide composition -with an organic group of 1 to 25 carbon atoms containing an element selected from the group consisting of O, N, S, F, I, Br, Cl and combinations thereof linked through a silicon carbon bond to a surface of walls forming pores which comprises:
- (a) providing as a solution a mixture of (i) a silicon oxide precursor;
- (ii) a neutral polymeric surfactant which comprises poly(oxyalkylene) polymer as a template having a hydrophobic and a hydrophilic moiety;
- and (iii) a hydrolyzable organic silicon compound selected from the group consisting of an alkoxide and a halide with the organic group linked to the silicon of the silicon compound, wherein the organic group contains an element selected from the group consisting of O, N, S, F, I, Br, Cl and combinations thereof;
- (b) mixing the solution to form a precipitated composition in the presence of a solvent comprising water so that the hydrolyzable organic silicon compound is hydrolyzed;
- and
- (c) removing the surfactant from the precipitated composition by solvent extraction to form the organic-inorganic silicon oxide composition, so that the organic group linked through the silicon-carbon bond is on the surface of the walls forming the pores.
A method for the preparation of a porous synthetic semi-crystalline hybrid organic-inorganic silicon oxide composition-with an organic group of 1 to 25 carbon atoms containing an element selected from the group consisting of O, N, S, F, I, Br, Cl and combinations thereof linked through a silicon carbon bond to a surface of walls forming pores which comprises:
- (a) providing as a solution a mixture of (i) a silicon oxide precursor;
- (ii) a non-ionic polymeric surfactant which comprises a poly(oxyalkylene) polymer as a template having a hydrophobic and a hydrophilic moiety;
- (iii) a hydrolyzable organic silicon compound selected from the group consisting of an alkoxide and a halide with the organic group linked through the silicon carbon bond;
- and (iv) a hydrolyzing agent;
- (b) mixing the solution to form a precipitated composition in the presence of a solvent comprising water so that the hydrolyzable organic silicon compound is hydrolyzed;
- and
- (c) removing the surfactant from the precipitated composition by solvent extraction to form the organic-inorganic silicon oxide composition, so that the organic group linked through the silicon carbon bond is on the surface of the walls forming the pores linked to the silicon.
A method for the preparation of a porous synthetic, semi-crystalline hybrid organic-inorganic silicon oxide composition with an organic group of 1 to 25 carbon atoms linked through a silicon carbon bond to a surface of walls forming pores which comprises:
- (a) providing as a solution a mixture of (i) a silicon oxide precursor;
- (ii) a neutral polymeric surfactant which comprises poly(oxyalkylene) polymer as a template having a hydrophobic and a hydrophilic moiety;
- and (iii) a hydrolyzable organic silicon compound selected from the group consisting of an alkoxide and a halide with the organic group linked to the silicon of the silicon compound;
- (b) mixing the solution to form a precipitated composition in the presence of a solvent comprising water so that the hydrolyzable organic silicon compound is hydrolyzed;
- and
- (c) removing the surfactant from the precipitated composition by solvent extraction to form the organic-inorganic silicon oxide composition, so that the organic group linked through the silicon-carbon bond is on the surface of the walls forming the pores, wherein the composition is represented by the anhydrous oxide formula:
- SiO2(SiO1.0R2.0)x
- where R is the organic group incorporated into the framework, Si is a silicon atom, O is oxygen and x is between 0.01 and 0.25.
Dependencies are inferred from the claim text.