Method of removing chlorofluorocarbons from the atmosphere

Details Method of removing chlorofluorocarbons from the atmosphere Method of removing chlorofluorocarbons from the atmosphere

1990-05-29

1991-03-05

Warden, Robert J.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Halogenous component

423659, 423DIG70, 422122, 422123, C01B 719, B01J 800

Patent

active

049976320

ABSTRACT:
A method of using photoactive semiconductors to reduce atmosphere chlorofluorocarbons by dispersing photoactive semiconductor particles, namely titanium dioxide, zinc oxide or zinc sulfide into the stratosphere, activating the particles through exposure to ambient light, accumulating chlorofluorocarbons by chemisorption into the semiconductor, precipitating the reacted particles from the stratosphere and hydrolyzing the chlorofluorocarbon moiety into involatile components.

REFERENCES:
C-Y Hsiao, C-L Lee and D. F. Ollis, "Heterogeneous Photocatalysis: Degradation of Dilute Solutions of Dichloromethane (CH.sub.2 Cl.sub.2) Chloroform (CHCl.sub.3), and Carbon Tetrachloride (CCl.sub.4) with Illuminated TiO.sub.2 Photocatalyst", Jour. Cat. 82, 418-423 (1983).

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