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This study presents insights into the use of activated Al2O3 ${\text{Al}}_{2}{{\rm{O}}}_{3}$ catalysts to improve the energy efficiency of NOx ${\text{NO}}_{x}$ production in atmospheric pressure air plasma. The introduction of catalysts in the direct current glow discharge system reduces the energy cost of NOx ${\text{NO}}_{x}$ production by up to 45% at low gas flow rates. Notably, even when positioned away from the plasma zone, the catalyst enhanced NOx ${\text{NO}}_{x}$ production, suggesting a significant role for the catalytic activation of downstream neutral species. The study also introduced a novel approach involving an air plasma jet infused with floating catalyst powder. This method significantly increased energy efficiency at higher discharge currents, with an associated energy cost of 2.9 MJ/mol for NOx ${\text{NO}}_{x}$ production. [ABSTRACT FROM AUTHOR]