Besides their low cost, they offer textural, compositional, and morphological properties that can be tailored for diverse targeted catalytic reactions . Specially, silica is an appealing material for plasma catalytic ammonia synthesis due to: (i) its low electrical resistivity that can lead to more stable and uniform plasma discharges; (ii) readiness to dissolve hydrogen; (iii) weak bonding with nitrogen; (iv) high thermal and chemical stability in the presence of water, which is the source of hydrogen in this work. Our catalyst selection is supported by our group's previous experience on the rational design of catalysts for ammonia synthesis . Moreover, it has been indicated that silica-based catalysts promote the decomposition of N2O , which is an unwanted by-product during ammonia production from water and N2 .