Synthesis of microporous ceramics

Details Synthesis of microporous ceramics Synthesis of microporous ceramics

1994-05-24

1997-07-01

Dean, Karen A.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

501 80, 501 88, 501 92, 524588, 524789, 524857, 524858, 524864, C04B 3800, C04B 3552, C04B 3556, C08L 8504

Patent

active

056439873

ABSTRACT:
The present invention provides for microporous ceramic materials having a surface area in excess of 70 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 0.03 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 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.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 intermediate under controlled conditions of heating up to temperatures of less than 1100.degree. C. to form a microporous ceramic product.

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J. F. Janik et al, "Baron Nitride as a Selective Gas Adsorbent", Langmuir 1994, vol. 10, pp. 514-518.
T. T. Borek etal, "Highly Microporous Boron Nitride For Gas Adsorption", Langmuir 1991, vol. 7. pp. 2844-2846.
Ceramics from Organometallic Polymers, Peuckert et al, 1990, pp. 398-404.
Pyrolysis Chemistry of Poly(organosilazanes) to Silicon Ceramics, Han et al, Feb. 24, 1992, pp. 705-711.
A method for 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, Nov. 5, 1990, pp. 237-255.

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