Spinel-based catalysts for reducing exhaust emissions of NO.sub.x
AssigneeRhone-Poulenc Chimie
InventorsPhilippe Barthe, Pierre Macaudiere, Thierry Seguelong
Life of this patent
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Abstract
Oxygen-rich exhaust gases, for example those emanating from internal combustion engines, e.g., diesel engines, are catalytically treated/converted to reduce emissions of NO.sub.x, in the presence of a catalytically effective amount of either (a) a spinel mass oxide essentially having the formula ZnAl.sub.2 O.sub.4, or (b) a normal or inverse spinel oxide other than ZnAl.sub.2 O.sub.4, for example ZnGa.sub.2 O.sub.4, SnZnGa.sub.2 O.sub.4 or MgAl.sub.2 O.sub.4.
Claims24
A process for the catalytic treatment/conversion of oxygen-rich exhaust gases to reduce emissions of NO.sub.x comprising contacting an oxygen-rich exhaust gas with a catalytically effective amount of a normal or inverse spinel oxide other than ZnAl.sub.2 O.sub.4.
A process for the catalytic treatment/conversion of exhaust gases containing at least 5% by volume of oxygen to reduce emissions of NO.sub.x comprising contacting an oxygen-rich exhaust gas with a catalytically effective amount of a normal or inverse spinel oxide other than ZnAl.sub.2 O.sub.4.
Dependencies are inferred from the claim text.