METAL FERRITE OXYGEN CARRIERS FOR CONVERSION OF CO2 TO CO AND FUEL TO SYNGAS OR CO

摘要

The invention provides a use of metal ferrite oxygen carrier for converting carbon dioxide to carbon monoxide or synthesis gas via three processes: catalytic dry reforming of methane, chemical looping dry reforming of fuel and promoting coal gasification with CO₂. The metal ferrite oxygen carrier comprises M_zFe_xO_y, where M_zFe_xO_y is a chemical composition with 0x≤4, z0 and 0y≤6 and M is one of Ca, Ba, and/or combinations thereof. For example, M_zFe_xO_y may be one of CaFe₂O₄, BaFe₂O₄, MgFe₂O₄, SrFe₂O₄ and/or combinations thereof. In catalytic dry reforming, methane and carbon dioxide react in the presence of metal ferrites generating a product stream comprising at least 50 vol. % CO and H₂. In another embodiment, chemical looping dry reforming process where metal ferrite is reduced with a fuel and then oxidized with carbon dioxide is used for production of CO from carbon dioxide. In another embodiment, the metal ferrite is used as a promoter to produce CO continuously from coal gasification with CO₂.