The solar-driven endothermic reaction of coal and magnetite was studied for mixing solar and fossil energies. The overall reaction can be represented by CHx+Fe3O4 = CO + 3FeO + 12xH2, where x depends on the stoichiometry of the coal utilized (x≈0.2 in our study). Laboratory experimental...

O2-release from carbon-bearing Ni(II) ferrite (CBNF) was studied with TG-MS and DSC. Release of lattice oxygen as O2 was found to take place at 200–300°C and was associated with an endothermic temperature peak. The proposed thermochemical reaction is Olat.(s) = Vö(s) + (12) O2(g), ΔH° =...

Water splitting with Mn(II) ferrites (MnFe2O4, Mn0.5Fe2.5O4) and CaO at 1273K has been studied. The process accompanies a phase change and a calcium-manganese oxide (Cax(Fe,Mn)yOz) is formed. For CaO/MnFe2O4 mole ratios above 3, a single phase of Ca3(Fe2.02/3,Mn0.98/3)3O7.02 with crystal...

The praseodymium oxide redox system releases and incorporates oxygen into an inert gas. Reductions of Pr6O11 to Pr5O9 and Pr5O9 to Pr9O16 were analyzed while heating a mixture of air with N2 at O2 partial pressures of 2 × 102-6 × 103 Pa from 373 to 833 K. Oxidations of Pr9O16 to Pr5O9 and...

An endothermic chemical system composed of pulverized metal oxide and carbon has been investigated with a view to utilizing waste heat and carbonaceous compounds effectively. Oxides of Cu and Mn and also MMn2O4 (M = Li or Mg) were used. In an N2-gas stream, the metal oxide was reduced by...

An endothermic chemical system composed of pulverized iron-based oxide and carbon powder has been investigated by using the temperature swing method (TSM) at 700–800 °C. Ferrites of Zn, Mn, and Ni, and magnetite were studied. The magnetite showed the most promising result. In the TSM,...