Application of Fe2O3−Al2O3 Composite Particles as Solid Looping Material of the Chemical-Loop Combustor

Fe2O3−Al2O3 composite particles were synthesized by changing the sintering temperature in the range of 800−1370 °C under the conditions that the content of Fe2O3 and the sintering time were given as 25 wt % and 10 h, respectively, and their applicability as a solid looping material of the chemical-loop combustor was discussed. Two solid solutions, Fe2O3(rich)−Al2O3 (hematite(ss)) and Fe2O3−Al2O3(rich) (corundum(ss)), were formed at 1000 and 1250 °C, respectively, and the formation of these solid solutions was promoted by increasing the sintering temperature. Reduction tests of Fe2O3−Al2O3 composite particles sintered in the temperature range of 1200−1370 °C were carried out by the pulse injection technique using hydrogen gas. In the low reduction range below 10%, Fe2O3 in hematite(ss) was reduced to Fe3O4, and that in corundum(ss) was not changed. Corundum(ss) is not useful for the reduction operation of the chemical-loop combustor. However, the mechanical strength of particles was improved by increasing ...

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