Abstract
Laboratory experiments were conducted by using Co and Sn as Nox reduction catalysts both in simulated and actual engine exhaust gas. The Catalyst temperature and concentration of NO in the simulated exhaust gas were selected as experimental parameters. The experimental results showed that DME oxidation occurred at higher temperature with the Co and Sn catalyst. The effect of NO on DME oxidation and formaldehyde formation characteristics with Nox reduction catalysts was significant. The formaldehyde formation occurred at a lower temperature both in simulated and actual engine exhaust gas and reduced to zero at higher temperature. A high Nox reduction was possible just by increasing the catalyst temperature and reducing agent.