Method and apparatus for regenerating gas used in carbon dioxide

Details Method and apparatus for regenerating gas used in carbon dioxide Method and apparatus for regenerating gas used in carbon dioxide

1994-12-27

1998-11-24

Straub, Gary P.

Coherent light generators

Particular active media

Gas

502 38, 502514, 423210, 423219, 4232397, 423247, 4232155, 4235801, 423655, H01S 322, B01J 3812, B01D 5300

Patent

active

058418040

ABSTRACT:
An improved method and apparatus for regeneration and reuse of He--N.sub.2 --CO.sub.2 mixed gas for carbon dioxide gas laser. The laser gas after use is contacted with a noble metal catalyst (for example, Pt--Al.sub.2 O.sub.3) at a temperature of 200.degree.-300.degree. C. to react CO and O.sub.2 formed by laser discharge so as to form CO.sub.2. A suitable quantity of moisture in the contained laser gas causes steam-reforming reaction of H.sub.2 O and CO, and reaction of H.sub.2 and O.sub.2 following thereto, and continuous operation over a long period is thus possible. Poisoning of the catalyst by NO.sub.x is suppressed at this relatively high temperature of reaction. Activity of the catalyst, when decreased, may be recovered by reactivation by passing a reactivating gas consisting of carbon monoxide, oxygen and helium through the catalyst bed at a temperature of 400.degree. to 500.degree. C.

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Smith et al. "Catalysis in Sealed Co.sub.2 Lasers" J Phys. D:Appl. Phys. vol. 7, Printed in Great Britain pp. 1652-1659, 1974 no month.
Sorem et al. "Catalytic Converters for Closed-Cycle Operation . . . " Rev. Sci. Instrum. vol. 52 No. 8 pp. 1193-1196, 1981 Aug.
Olsen Unit Processes and Principles of Chemical Engineering 250 Fourth Ave. New York, D. Van Nostrand Co., Inc. pp. 1-3, 1932 no month.

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