Production of oxygen on the moon - Which processes are best and why

An evaluation of the 20 processes put forth for the liberation of oxygen from lunar materials has resulted in a ranking according to overall feasibility. At this time, the eight processes considered to be the most likely candidates for oxygen production on the moon are: ilmenite reduction with H2, CO, and CH4, glass reduction with H2, molten silicate electrolysis, fluxed molten silicate electrolysis, vapor pyrolysis, and ion plasma pyrolysis.