Molecular sieve - photoactive semiconductor membranes and reactions employing the membranes
First Claim
1. A membrane for affecting the composition of material coming in contact with the membrane, comprising:
- an inert porous substrate having a pore size from about 2.5 to 50 microns and semiconductor material including TiO2 supported by the porous substrate, the semiconductor material including a photoactive polymeric metal/semimetal oxide matrix and molecular sieve material impregnated within the matrix, the molecular sieve material including zeolitic material having pore size from about 3 to 12 angstroms.
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Abstract
Methods for forming membranes of semiconductive material incorporating molecular sieve material therein can involve sol gel techniques and suction techniques. The semiconductors, such as metal oxides, sulfides or carbides have photoactivity and are useful in photocatalytic reactions. An example of such a membrane is titanium oxide including zeolite molecular sieve incorporated therein. The membranes can be used to perform useful chemical reactions such as the mineralization of organic chemicals in the presence of light. For example, many toxic organic chemicals can be converted to useful or benign products by contacting those chemicals with active metal oxide-molecular sieve membranes in accordance with the invention and illuminating the membranes with light of a suitable wavelength.
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Citations
20 Claims
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1. A membrane for affecting the composition of material coming in contact with the membrane, comprising:
an inert porous substrate having a pore size from about 2.5 to 50 microns and semiconductor material including TiO2 supported by the porous substrate, the semiconductor material including a photoactive polymeric metal/semimetal oxide matrix and molecular sieve material impregnated within the matrix, the molecular sieve material including zeolitic material having pore size from about 3 to 12 angstroms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of forming an inorganic membrane, comprising:
impregnating a porous substrate with molecular sieve particles and exposing the substrate with a titanium alkoxide to form a film of titania on the surface of the impregnated substrate. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
Specification