Nanosecond Dielectric Barrier Discharge plasma for dry reforming of methane via Ni-based mixed metal oxides catalysts: effect on product distribution and energy efficiency

Plasma processing can enable decentralized upgrading of biogas using renewable power. Our nanosecond-pulsed Dielectric Barrier Discharge (DBD) reactor, coupled with Ni-based mixed metal oxide catalysts, enhances the performance of plasma-assisted dry reforming of methane. NiZnAl and NiMgAl synthesized via Layered Double Hydroxides (LDHs) intensify H 2 and CO yield compared to the plasma alone reference. NiZnAl has a major impact on CO 2 conversion (95% increase), and in turn on CO selectivity (20% higher). NiMgAl drives CH 4 conversion higher than the plasma-alone case, with H 2 selectivity enhanced by 35%, and 3.5-fold production of C 2 species. Hence, the H 2 /CO ratio varies with the deployed catalyst. Energy efficiency is intensified by ∼30% by catalyst addition. A similar improvement is achieved by extending the plasma zone, with increased conversion at comparable dissipated power. Hence, catalyst formulation and reactor design can substantially improve the performance of a process that could be pivotal in the energy transition.