Synthesis of microporous ceramics

Details Synthesis of microporous ceramics Synthesis of microporous ceramics

C - Chemistry, Metallurgy

04

B

C04B 38/06 (2006.01) B01D 71/02 (2006.01) C04B 38/00 (2006.01)

Patent

CA 2148402

The present invention provides for microporous ceramic materials having a surface area in excess of 70 m2/gm and an open microporous cell structure wherein the micropores have a mean width of less than 20 Angstroms and wherein said microporous structure com- prises a volume of greater than about 0.03 cm3/gm of the ceramic. The invention also provides for a preceramic composite intermediate composition comprising a mixture of a ceramic precursor and finely divided silicon carbide or silicon nitride, whose pyrolysis product in inert atmosphere or in an ammonia atmosphere at temperatures of up to less than about 1100°C gives rise to the microporous ceramics of the invention. Also provided is a process for the preparation of the microporous ceramics of the invention involving pyrolysis of the ceramic intermediate under controlled conditions of heating up to temperatures of less than 1100°C to form a microporous ceramic product.

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