| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust gas-purifying material and method capable of efficiently reducing and removing nitrogen oxides from combustion exhaust gas containing oxygen in quantity equal to or more than the theoretical reaction quantity to nitrogen oxides or unburned components such as carbon monoxide, hydrogen, a hydrocarbon and the like and also containing moisture over a wide temp. range. SOLUTION: This exhaust gas-purifying material is obtained by supporting 0.2-15wt.% (a value in terms of a metal element) of one or more kind of an element and/or a compd. selected from the group consisting of silver and a silver compd. on a porous inorg. oxide. The porous inorg. oxide is tin oxide alone or a composite or mixed oxide of at least one kind of a component selected from the group consisting of alumina, titania, silica, zirconia, zinc oxide, magnesium oxide and zeolite and tin oxide. |
