| 摘要 |
Provided are a complex oxide useful as a catalyst that has superior heat resistance and is able to remove a nitrogen oxide in the presence of ammonia; a method for producing the same; a nitrogen-oxide removal catalyst, which contains the complex oxide as an active ingredient; a method for removing a nitrogen oxide using the same; and an apparatus including the catalyst. The complex oxide containing cerium oxide, titanium oxide, zirconium oxide, and sulfate (sulfate ion: SO42−) and having the cerium oxide content of 15 to 30 percent by weight and the sulfate content of 1.6 percent by weight or more, is superior in catalytic activity (ability to remove a nitrogen oxide in the presence of ammonia) and thermal stability. Accordingly, a complex oxide that is composed of cerium oxide, titanium oxide, zirconium oxide, and sulfate and have the cerium oxide content of 15 to 30 percent by weight and the sulfate content of 1.6 percent by weight or more is useful for removing a nitrogen oxide. |
