TL;DR: Hydrogen Reduction is a main entry in the 外星矿物知识引擎 database.
Reduction of ilmenite (FeTiO₃) with hydrogen gas at 900-1100°C to produce water, which is then electrolyzed to oxygen and hydrogen
Organization
NASA JSC, University of Glasgow, ESA
Target
Lunar mare regolith (ilmenite-rich)
Status
Laboratory demonstrated with Apollo samples and simulants
Breakthrough
Demonstrated with actual Apollo 11 and Apollo 16 samples; water yield of 10-15% from ilmenite