The aim of this work was to investigate the relation between the reactor shape and N₂O conversion to NO, nitrogen and oxygen in the gliding discharge. The discharge was coupled with a catalytic bed. The temperatures of the catalyst were 480°C and 600°C. The object of the studies was to determine the effect of a CuO/γ-Al₂O₃ catalyst packed in the discharge space on the conversion of nitrous oxide to oxygen, nitrogen and nitric oxide. The overall conversion of nitrous oxide in the plasma-catalytic process depends on temperature of the CuO/γ-Al₂O₃ catalyst. The experimental reactor used enabled to check two kinds of the discharge space. The obtained results showed that the arrangement of the discharge space has a strong bearing on the conversion of nitrous oxide to NO.