Carbon Monoxide Silicate Reduction System
The Carbon Monoxide Silicate Reduction System (COSRS) is a novel technology for producing large quantities of oxygen on the Moon. Oxygen yields of 15 kilograms per 100 kilograms of feed soil were demonstrated during Phase I using both lunar and Mars soil simulants. This is about five times the oxygen yield achievable by hydrogen reduction. Up to 30 kilograms of oxygen per 100 kilograms of feed soil are recoverable by adjustment of the carbon-silicon ratio.Soils are sequentially subjected to iron oxide reduction by carbon monoxide, in-situ deposition of carbon throughout the soil by carbon monoxide disproportionation, and finally high-temperature carbothermal reduction of silicates by the deposited carbon.COSRS operates in a closed system. An inventory of carbon is maintained in the form of carbon monoxide, carbon dioxide, and solid carbon. Most of the oxygen recovered from soil is in the form of carbon monoxide, which is converted to carbon dioxide. Carbon dioxide is then reacted with hydrogen in a reverse water gas shift reactor. The RWGS system regenerates carbon monoxide for use in the COSRS process and produces water, which is electrolyzed. Hydrogen from electrolysis is recycled within the RWGS system. Oxygen from electrolysis is the COSRS product.
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