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Chemical-looping combustion (CLC) is a combustion technology with inherent separation of the greenhouse gas CO 2 . The technique involves the use of a metal oxide as an oxygen-carrier, which transfers oxygen from the combustion air to the fuel. The metal oxide Fe 2 O 3 on MgAl 2 O 4 support was examined, and particles of diameter 125−180 μm were prepared by freeze-granulation. The reactivity was evaluated in a fluidized-bed reactor, where the atmosphere was periodically changed. Reduction was performed in 50% CH 4 and 50% H 2 O, while the oxidation was performed in 5% O 2 . The sintering temperature and the ratio of metal oxide/inert were varied in order to find the optimal particle properties. The particles were characterized with respect to crushing strength, surface structure, and chemical composition, and 60% Fe 2 O 3 on 40% MgAl 2 O 4 sintered at 1100 °C was found to be the most suitable oxygen carrier. The particle had a high reactivity and showed no tendency to agglomerate or break apart during the cyclic tests. The results indicate that the amount of material needed in the fuel reactor would be in the order of 150 kg/MW.
Johansson et al. (Sat,) studied this question.
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