Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1987-11-23
1989-05-09
Stoll, Robert L.
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
502305, C01G 3702
Patent
active
048288187
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), Swanier et al.
patent: 3512930 (1970-05-01), Bottjer et al.
patent: 3978145 (1976-08-01), Knaak
patent: 4161409 (1979-07-01), Schiffman
patent: 4367213 (1983-01-01), Fioracci et al.
patent: 4574078 (1986-03-01), Cortesi et al.
Am. Chem. Soc. vol. 58, No. 5, pp. 697-705 R. L. Burwell et al. (1936) "The Activated Adsorption of Hydrogen on Chromic Oxide Gel. The Effect of Gas Pressure."
Am. Chem. Soc. vol. 82, pp. 6272-6291 R. L. Burwell et al. (1960) "Reactions between Hydrocarbons and Deuterium on Chromium Oxide Gel I. General."
Armor John N.
Carlson Emery J.
Cunningham William J.
Smith Addison M.
Allied-Signal Inc.
Buff Ernest D.
Fuchs Gerhard H,.
Stoll Robert L.
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