Nitrogen oxide adsorbing material

摘要

A material effective for adsorbing NOx from an exhaust stream of a combustion process, such as from an internal combustion engine operating under lean burn conditions, is disclosed. The material comprises an alkali metal-doped and copper-doped hydrous metal oxide material that has been calcined. The alkali metal is selected from potassium and sodium. The material is coated onto a substrate, such as ceramic beads or pellets, or a honeycomb cordierite monolith, and placed in contact with the exhaust stream.