1988 Volume 1988 Issue 12 Pages 2031-2036
The kinetic measurement has been made for bromination of calcium oxide and hydrolysis of calcium bromide in the UT-3 therpochemical water-decomposition cycle. In this cycle, the Ca compound is used repeatedly between bromide and'oxide. The compound; therefore, must be distributed in a solid structure being composed of inert materials. Four kinds of candidate materials such as SiO2, Al203, Ti02, and Zr02 were mixed with CaO powders and examined their reactivities in several cyclic runs. Pellets with TiO2 showed the best reactivity and reproducibility. Also, it was found that the structural change of pellet occurs in cyclic operation due to the difference of molar volume between reactant and product solid, resulting in the influential effect on the overall conversion.
Applying the homogeneous model, th e hydrolysis rate of calcium bromide rv was given by
where CH20 is molar concentration of H20, C0CaO is initial molar concentration of CaO, and X is conversion based on the bromination.
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