Synthesis of microporous ceramics by ammonia pyrolysis of cerami

Details Synthesis of microporous ceramics by ammonia pyrolysis of cerami Synthesis of microporous ceramics by ammonia pyrolysis of cerami

1995-02-10

1997-12-09

Dean, Karen A.

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

Synthetic resins

From silicon reactant having at least one...

501 88, 501 80, 501 92, 10628711, 10628712, C08G 7700, C04B 3552

Patent

active

056962177

ABSTRACT:
The present invention provides for microporous ceramic materials having a surface area in excess of 100 m.sup.2 /gm and an 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 0.05 cm.sup.3 /gm of the ceramic. The pyrolysis product of ceramic precursor oligomers or polymers having a number average molecular weight in the range of from about 200 to about 100,000 g/mole in an ammonia atmosphere at temperatures of up to less than about 1200.degree. 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 precursor under controlled conditions of heating and with intermediate hold times, up to temperatures of less than 1200.degree. C., preferably less than 1000.degree. C., to form a microporous ceramic product.

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