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U.S. researchers have demonstrated a technology that uses the sun’s heat to convert carbon dioxide and water into the building blocks of traditional fuels, a reverse combustion process that may emerge as a practical alternative to sequestration of CO₂ emissions from power plants.

The prototype "Sunshine to Petrol" system, developed by Sandia National Laboratories in New Mexico, uses concentrated solar energy to trigger a thermo-chemical reaction in an iron-rich composite located inside a two-sided cylindrical chamber.

The iron oxide is designed to lose an oxygen molecule when exposed to 1,500 degree C heat, and then retrieve an oxygen molecule when it is cooled down, essentially converting an incoming supply of CO₂ into an outgoing stream of carbon monoxide.

Article continues: http://blog.cleantechies.com/2009/11/24/researchers-develop-machine-to-recycle-carbon-dioxide-fuel/