Table 2.

Efficiency of selected catalysts for ammonia production via NTP technology.

Selected Catalyst	Reaction Conditions	Efficiency (gNH3 kWh−1)	Reference
Ru/Si–MCM-41	N2:H2 = 1:1; 5000 V	1.7	[23]
Ru/MCM-41	N2:H2 = 3:1; 6000 V	2.2	[24]
Ru(2)–Mg(5)/γ-Al2O3	N2:H2 = 4:1; T = 250 °C	25.5	[25]
Ni–MOF	N2:H2 = 1:4; T = 82.3 °C	0.23	[26]
PZT	N2:H2 = 3:1; 5000 V	0.65	[29]
DLC-coated Al2O3	N2:H2 = 3:1; 17,500 V	0.9	[30]
Zeolite 5A	N2:H2 = 1:1	15.5	[31]
Ni/Al2O3	N2:H2 = 1:2; 24,000 V	0.45	[32]