Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1995-02-04
1995-12-05
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
502 80, C01B 2104
Patent
active
054726778
ABSTRACT:
The invention describes a highly efficient catalytic pollution control process for removing N.sub.2 O from gaseous mixtures. The process utilizes catalysts derived from anionic clay minerals, which after appropriate heat activation, provide superior N.sub.2 O decomposition activity. The catalytic process comprises contacting an N.sub.2 O-containing gaseous mixture with the decomposition catalyst under conditions sufficient to convert the N.sub.2 O into gaseous nitrogen and gaseous oxygen. The process catalysts are derived from anionic clay materials such as the hydrotalcites, sjogrenites and pyroaurites. A small but critical amount of an activator metal is provided to promote the decomposition of N.sub.2 O, particularly in wet gas steams. The activator metal may be an alkali metal such as sodium, potassium or lithium, or an alkaline-earth metal such as magnesium, with sodium giving particularly good results.
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Armor John N.
Braymer Thomas A.
Farris Thomas S.
Li Yuejin
Dunn Jr. Thomas G.
Engelhard Corporation
Straub Gary P.
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