Nanoporous ceramics with catalytic functionality

Details Nanoporous ceramics with catalytic functionality Nanoporous ceramics with catalytic functionality

1995-12-27

1998-12-22

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523200, 501 88, 501 89, 501 91, 501 92, 501 93, 524176, 524177, 524178, 524356, 524357, 524445, 524398, 524399, 524400, C08K 500

Patent

active

058520880

ABSTRACT:
The present invention provides for amorphous, nanoporous, catalytic metal-containing ceramic material having a surface area in excess of 70 m.sup.2 /gm and characterized by a high content of open microporous cell structure wherein the micropores have a mean width of less than 20 Angstroms and wherein said microporous structure comprises a volume of greater than about 0.03 cm.sup.3 /gm of the ceramic. The invention also provides for a preceramic composite intermediate composition comprising a mixture of a ceramic precursor and from about 0.5 up to about 65 wt % of an organometallic compound containing a metal of Group IB, II, III, IV, IV, V, VIB, VIIA or VIII of the Periodic Table, including rare earth metals, whose pyrolysis product in ammonia or an inert atmosphere at temperatures of up to less than about 1100.degree. C. gives rise to the nanoporous catalytic ceramics of the invention. Also provided is a process for the preparation of the nanoporous ceramics of the invention involving pyrolysis of the ceramic intermediate under controlled conditions of heating up to temperatures of less than about 1100.degree. C. to form a nanoporous ceramic product useful in catalytic and membrane separation processes.

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Ceramics From Organometallic Polymers, Peuckert et al, 1990, 398-404.
Pyrolysis Chemistry of Poly(organosilazanes) to Silicon Ceramics, Han et al, Feb. 24, 1992, 705-711.
A method of the determination of the pore size distribution of molecular sieve materials and its application to the characterization of partially pyrolyzed polysilastyrene/porous glass composite membranes, Grosgogeat et al, Journal of Membrane Science, 57 (1991) 237-255.

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