| 초록 |
The selective catalytic reduction (SCR) of NOx by methane (CH4-SCR : CH4 + O2 + 2NO → CO2 +2H2O + N2) has been studied as an alternative after treatment technology of thermal NOx with slipped methane from natural gas combustion sources. We report the indium containing ZSM-5 catalysts for the CH4-SCR in the presence of methane and excess of oxygen condition. The In cations in frameworks of ZSM-5 play a role in active sites of the CH4-SCR reaction. The addition of Pt in the In/ZSM-5 promoted the NO oxidation to NO2, resulting in formations of strong oxidant such as InNO3 and mono-nitrosyl complex for activating methane. The reduction treatment with the H2 flow further improved the CH4-SCR activity over both the In,Pt/ZSM-5 and In/ZSM-5 catalysts due to the increased sites of In cations in the frameworks. |
