OXIDE CATALYST MATERIAL FOR REMOVING NITROGEN OXIDE AND METHOD FOR REMOVING NITROGEN OXIDE

摘要

PURPOSE:To provide an oxide catalyst material having a NOx reduction- decomposition function even in an atmosphere of a high oxygen concentration and to purify exhaust gas from combustion engines such as diesel engines and lean-burn engines. CONSTITUTION:A material in which 5-75wt.% of CeO2 is incorporated into a spinel type crystalline complex oxide containing metal elements of Ni and Ga as an oxide catalyst material which reduces and decomposes nitrogen oxides such as NOx and in which a Ga/Ni atomic ratio (n) is 2.5 3.3 is used come into contact with exhaust gas containing nitrogen oxides in an oxidative atmosphere in which oxygen of a high concentration and carbon-containing gas which has a reducing function exist so as to reduce, to decompose, and to remove the nitrogen oxides.