Patent ID: 6338831
Filing Date: 2002-01-15
Classification: B01D,B01J

Abstract:
A process for purifying exhaust gas from an internal-combustion engine comprising:passing said exhaust gas in contact with a storage material for sulfur oxides, wherein the storage material includes a magnesium-aluminum spinel (MgO.Al2O3), wherein the storage material has a molar ratio of magnesium oxide to aluminum oxide of 2:1 to 10:1, and wherein the magnesium oxide present in stoichiometric excess is homogeneously dispersed in the storage material; storing sulfur oxides contained in the exhaust gas on the storage material at a lean normalized air/fuel ratio; and after a storage capacity of the storage material has been exhausted, desulfurizing the storage material at a rich normalized air/fuel ratio and an exhaust gas temperature above 500Â° C.