| 초록 |
A large number of diesel engines are being replaced by natural gas engines to reduce the emission of pollution. However, unburned methane is emitted from natural gas vehicles. The catalytic combustion of methane is one of the most effective methods for reducing methane emission. Currently, Pd-based noble metal catalysts are the most active catalysts for the reaction. However, the volatile price of noble metal limits their industrial application. Transition metal oxides, such as cobalt oxides are attractive alternatives. In this work, mesoporous cobalt oxide catalysts were synthesized via a nano-replication method. In addition, samples were treated with different concentrations of nitric acid to modify their surface structures and chemistry. A significant enhancement in the methane oxidation activity was observed for the acid-treated catalysts and the properties of the acid-treated catalyst were investigated in detail using various characterization techniques. |
