Experimental and modeling-based analysis of reaction pathways on catalysts for natural gas engines under periodic lean/rich oscillations

• Significantly improved methane conversion with targeted lean/rich oscillations. Characteristic 'W' shape concentration profiles during Analysis of different reaction regimes over the shape. Reaction linked to catalyst oxidation state and adsorbed species. Methane (CH 4 ) has prospective becoming one major energy carriers for heavy-duty mobility, but its catalytic abatement remains a challenge. CH pathways were analyzed using periodic oscillations, which resulted in higher than under static conditions. At both lean-to-rich rich-to-lean transitions such local maxima followed by minima each lean rich phase. The profile oscillation displayed Four identified corresponding four sections characteristic Entering phase, Steam reforming (SR) started, was then hampered formation carbonaceous species CO interaction surface. By entering SR is again enhanced as more active sites became available due oxygen related reactions. However, increasing chemisorbed slowed down . transition between consecutive changes Ce 3+ coverage ratio, plays an important role reaction. Similar shapes observed various conditions at measurement points along axis. found shift downwards decreasing frequencies until frequency threshold, marked equivalence rich/lean phase length time needed completely deplete/replenish Oxygen storage capacity (OSC). characteristics reproduced numerical simulations, revealed spatial distribution reactions these dynamic Optimal overall reached even catalyst.