Chromia aerogel, method of producing same and fluorination proce

Details Chromia aerogel, method of producing same and fluorination proce Chromia aerogel, method of producing same and fluorination proce

1988-12-12

1990-03-27

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570165, C07C 1720

Patent

active

049122703

ABSTRACT:
Chromium(III) oxide and hydroxide aerogels are produced by the reaction of chromium(VI) oxide with a solvent which is reducing to chromium(VI), such as methanol, heating the solution to hypercritical conditions, and venting the solvent hypercritically. The product aerogels exhibit surface areas above 400 m.sup.2 /g, pore volumes of at least 2 cm.sup.3 /g and a substantially uniform pore size distribution. Also disclosed is a unique process which employs high pore volume, high surface area chromium(III) oxide or hydroxide as a fluorination catalyst. More particularly, reaction of C.sub.2 Cl.sub.3 F.sub.3 with HF over these catalysts produced high yields of C.sub.2 Cl.sub.2 F.sub.4 and C.sub.2 ClF.sub.5.

REFERENCES:
patent: 3258500 (1966-06-01), Swamer et al.
patent: 4828818 (1989-05-01), Carlson et al.
Burwell, Jr. et al., Am. Chem. Soc., vol. 82, pp. 6272-6291 (1960).

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