Catalyst for lowering the amount of nitrogen oxides in the exhaust gas from lean burn engines
AssigneeOMG AG & Co.KG
InventorsLutz Marc Ruwisch, Ulrich Gobel, Juliane Theis, Rainer Domesle
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Abstract
The invention relates to a catalyst for lowering the amount of NOx in the lean exhaust gas from lean burn engines, comprising active aluminum oxide, magnesium oxide and at least one noble metal of the platinum group of the periodic table of the elements, as well as at least one nitrogen oxide storage material. The catalyst is characterized in that the magnesium oxide forms a homogeneous mixed oxide with aluminum oxide and is present in a concentration of about 1 to about 40 wt.-%, based on the total weight of the mixed oxide.
Claims24
A catalyst for lowering the amount of nitrogen oxides in the exhaust gas from lean bum engines, comprising at least one noble metal of the platinum group and at least one nitrogen oxide storage material in combination with a homogeneous Mg/Al mixed oxide of magnesium oxide and aluminum oxide, wherein magnesium oxide is present in a concentration of about 1 to about 40 wt.-%, based on the total weight of the Mg/Al mixed oxide.
Dependencies are inferred from the claim text.