| abstract |
(57) [Abstract] [Objective] To efficiently reduce and remove nitrogen oxides from combustion exhaust gas containing oxygen in excess of the theoretical reaction amount to unburned components such as nitrogen oxides, carbon monoxide, hydrogen, and hydrocarbons. To provide an exhaust gas purifying material that can be used. A first catalyst comprising silver and / or a silver compound or a mixture thereof supported on a porous inorganic oxide; A second catalyst comprising a porous inorganic oxide carrying copper oxide and / or copper sulfate; and a porous inorganic oxide comprising Pt, P d, Ru, Rh, Ir and a third catalyst carrying at least one element selected from the group consisting of Au, the first to third catalyst in order from the exhaust gas inflow side to the outflow side Exhaust gas purifying material. |