DECOMPOSITION OF CARBON-DIOXIDE TO CARBON BY HYDROGEN-REDUCED NI(II)-BEARING FERRITE

Hydrogen-activated Ni(II)-bearing ferrite, Ni0.372+Fe0.492+Fe2.093+O4. 00, showed a high rate of decomposition of carbon dioxide to carbon at 300 degrees C. This is based on the redox process of the Ni(II)-beari ng ferrite with the spinel type of crystal structure. The rates of bot h activation by hydrogen gas and oxidation in carbon dioxide gas were much improved in the Ni(II)-bearing ferrite. The rate of decomposition was 0.178 mol h(-1) for the activated Ni(II)-bearing ferrite and 0.00 5 92 mol h(-1) for the activated magnetite in the batch mode, being 30 times larger. The rate of carbon dioxide decomposition was 16 times h igher in the flow system in comparison with that of the activated magn etite.