| abstract |
For example, nitric oxide contained in a lean burn exhaust gas is efficiently purified in a temperature region around 300 ° C. using light oil as a reducing agent. A supported catalyst in which a metal catalyst component comprising gold and rhodium is supported on a carrier comprising an oxide containing at least silicon, wherein the sum of gold and rhodium for all metals in the metal catalyst component is Using a supported catalyst of 60% by mass or more, purification treatment of nitrogen oxide contained in the lean burn exhaust gas is performed using, for example, light oil as a reducing agent. [Selection figure] None |