| abstract |
The composition of the present invention is the oxide based on zirconium, cerium, niobium and tin, and these oxides are in ratio below based on the weight of oxide：Cerium oxide between 5% and 50%, the niobium oxide between 5% and 20%, the tin oxide between 1% and 10% and remainder is zirconium oxide.Said composition can be used in the catalyst system and catalyzing for SCR type methods, and the SCR types method is used to handle the gas containing nitrogen oxide (NOx). |