UT-3 thermochemical cycle for hydrogen production involves four gas-solid reactions. In order to make the cycle feasible, the solid reactant must be chemically reactive and physically stable in cyclic operation. Calcium oxide pellets, with CaO dispersed in the CaTiO3 inert matrix, were prepared and stearic acid, graphite, and corn starch were added as pore forming agents during the process. Experimental studies to improve and evaluate the Ca-pellets through the investigation into thermal decomposition of additives, X-ray diffraction, pore size distribution, conversion and reaction rate were conducted. The pore size distributions of the pellets were found to be strongly influenced by the type of pore forming agents used, and the volume of pores greater than 5μm markedly promoted hydrolysis rate.

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