Abstract:
Perovskite oxides of the Ln(0.5)A(0.5)MnO(3) (Ln=lanthanide, A=Sr, Ca) family have been investigated for the thermochemical splitting of H2O and CO2 to produce H-2 and CO respectively. The amounts of O-2 and CO produced strongly depend on the size of the rare earth ions and alkaline earth ions. The manganite with the smallest rare earth possessing the highest distortion and size disorder as well as the smallest tolerance factor, gives out the maximum amount of O-2, and, hence, the maximum amount of CO. Thus, the best results are found with Y0.5Sr0.5MnO3, which possesses the highest distortion and size disorder. Y0.5Sr0.5MnO3 shows remarkable fuel production activity even at the reduction and oxidation temperatures as low as 1200 degrees C and 900 degrees C, respectively.
