| 摘要 |
PROBLEM TO BE SOLVED: To provide a three-way catalyst excellent in low-temperature performance, having high sulfur poisoning resistivity, and also excellent in methane removal performance even on the lean side.SOLUTION: There is provided a three-way catalyst constituted by carrying ruthenium and platinum on an inorganic oxide carrier mainly composed of zirconium oxide of a monoclinic crystal, for removing reductively a nitrogen oxide by using methane as reducing power, in a three-way catalyst reaction treatment of methane-containing gas containing carbon monoxide, nitrogen oxide and methane which is generated by combustion of gas in which combustion air to a fuel is adjusted at a theoretical air-fuel ratio. |
