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Herein we demonstrate that the performance of mesoporous silica SBA-15 andSBA-15-Ag impregnated during plasma ammonia synthesis depend on the plasmaconditions. At high power the mesoporous silica SBA-15 without Ag produces thelargest amount of ammonia observed in our experiments, but the addition of Agprovides a minor benefit at lower powers. Plasma conditions were analyzed usingoptical emission spectroscopy using N2, N2+ and NH molecular bands andH{\alpha} lines. The analysis of optical emission, specifically Ha lines and N2molecular bands data shows that SBA-15 has higher electron density, and higherN2 vibrational temperature. Stronger N2+ emission relative to the neutral N2provides additional evidence for higher electron density in the SBA-15 packedbed reactors. The addition of Ag resulted in a lower concentration of atomichydrogen. Where Ag acts as a hydrogen sink facilitating surface reactions withnitrogen. The presence NH in the spectrum may indicate a higher concentrationof H in the SBA-15 reactor. From the materials point of view SBA-15 is a morerobust catalyst with a commendable surface area retention after plasma exposuredue to the lack of local heating generated when a metal is in the structure.

Unraveling the different regimes arisen during plasma ammonia synthesis on mesoporous silica SBA-15 through plasma diagnostics