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Plasma-Catalytic Ammonia Synthesis Beyond the Equilibrium Limit
preprintsubmitted on 30.01.2020, 00:11 and posted on 31.01.2020, 18:00 by Prateek Mehta, Patrick M. Barboun, Yannick Engelmann, David B. Go, Annemie Bogaerts, William F. Schneider, Jason C. Hicks
We explore the consequences of non-thermal plasma activation on product yields in catalytic ammonia synthesis, a reaction that is equilibrium-limited at elevated temperatures. We employ a minimal microkinetic model that incorporates the influence of plasma activation on N2 dissociation rates to predict NH3 yields into and across the equilibrium-limited regime. NH3 yields are predicted to exceed bulk thermodynamic equilibrium limits on materials that are thermal-rate-limited by N2 dissociation. In all cases, yields revert to bulk equilibrium at temperatures at which thermal reaction rates exceed plasma-activated ones. Beyond-equilibrium NH3 yields are observed in a packed bed dielectric-barrier-discharge reactor and exhibit sensitivity to catalytic material choice in a way consistent with model predictions. The approach and results highlight the opportunity to exploit synergies between non-thermal plasmas and catalysts to affect transformations at conditions inaccessible through thermal routes.
Read the published paper
in ACS Catalysis