Abstract
Potassium catalyst is a promising candidate for the removal of diesel particulate matter. A support is required on the filter in order to stabilize the catalyst and protect diesel particulate filter materials such as cordierite against high alkalinity derived from hydrated potassium ions. We used sodalite as the support for potassium carbonate and successfully synthesized a defect-free sodalite film on a cordierite substrate by an in situ hydrothermal treatment method. The performance of the K2CO3-doped film as a protection layer was investigated by SEM-EDX measurements before and after thermal treatment at 800 oC. An extremely small K content detected on the film-substrate interface indicates that the cordierite substrate was protected against potassium species by the obtained sodalite film.
