Synthesis of preceramic polymer-stabilized metal colloids...

C - Chemistry – Metallurgy – 04 – B

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C04B 38/00 (2006.01) B01D 71/02 (2006.01) B01J 37/08 (2006.01)

Patent

CA 2239141

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 comprises 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 nanoscale size metallic particles, 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 composite intermediate under controlled conditions of heating up to temperatures of less than about 1100 ~C to form a microporous ceramic product.

La présente invention concerne une matière céramique microporeuse présentant une superficie dépassant les 70 m?2¿/g et une structure de cellules microporeuses ouvertes dans laquelle les micropores ont une largeur moyenne inférieure à 20 Angströms et dans laquelle le volume de céramique de la structure microporeuse est supérieur à environ 0,03 cm?3¿/g. L'invention concerne également une composition intermédiaire pour composite précéramique constituée d'un mélange d'un précurseur de céramique et de particules métalliques de calibre nanométrique et dont la pyrolyse sous atmosphère inerte ou d'ammoniac dans des conditions de température n'excédant pas environ 1100 ·C donne naissance aux céramiques microporeuses de l'invention. L'invention concerne enfin un procédé de préparation des céramiques microporeuses de l'invention par pyrolyse de l'intermédiaire composite dans des conditions contrôlées de chauffage jusqu'à des températures n'excédant pas environ 1100 ·C, pour former un produit céramique microporeux.

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