Modelling excited species and their role on kinetic pathways in the non-oxidative coupling of methane by dielectric barrier discharge

A detailed kinetic scheme for non-thermal methane plasma is developed that considers the reactivity and relaxation of electronically vibrationally excited species. An atmospheric pressure dielectric barrier discharge reactor non-oxidative coupling modelled. Via 1D fluid modelling short periods time are investigated, while longer time, in order residence a combined 1D-0D approach followed. Modelling results good qualitative agreement with literature experiments. Around 86% energy input found to channel into creation The states exhibit very transient responses due their rapid formation during electron streamers fast quenching by VV VT processes. The, higher energy, rapidly converted, many which essentially instantly dissociate. Over 70% methane’s conversion proceeds via electronical excitation, contribution limited.