Development of EGR Reforming Catalyst for Gasoline Engine with Fuel Reformer

Abstract

Stability of high EGR combustion is improved by the addition of hydrogen. So, we developed "EGR reforming catalyst" which produces hydrogen rich gas from fuel by using heat and water vapor of exhaust in order to realize on-board hydrogen generation. It was found that main issue to realize EGR reforming catalyst was a suppression of catalyst deterioration under the exhaust gas condition. We found out that water activation of the catalyst decreased with carbon deposition on the catalyst surface due to sulfur compounds adsorption. Catalyst degradation was inhibited by the improvement of water activation of the catalyst using rare earth component.