| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 106 === In this study Fe2O3-CuO/Al2O3 oxygen carriers were be focused, various sintering temperatures were employed to fabricate the oxygen carriers. Fe2O3-CuO/Al2O3 oxygen carriers, which sintered at 1200°C, possess the optimal performance for reactivity test, recyclability test and mechanical test. In order to clearly understand the reduction kinetics, hydrogen and carbon monoxide as the reducing gas to react with FCA3112 respectively in thermogravmetric analyzer (TGA). Third order reaction (F3) model has the optimal fitting to describe the reduction of FCA3112 under hydrogen atmosphere. On the other hand, the same result was observed for the reduction of FCA3112 under carbon monoxide atmosphere. Moreover, the net reaction, which is verified by solid state model fitting for FCA3112 reduced by H2 atmosphere, is endothermic. By contrast, the net reaction is exothermic under CO atmosphere. Reduction mechanism of FCA3112 under either reducing gas was determined by X-ray diffraction (XRD). CuFe2O4 spinel decompose to Cu and Fe3O4 both at two kinds of reducing gas.
FCA3112 oxygen carriers were used for chemical looping combustion in fixed bed reactor. In order to determine the reduction time, long term reduction at 900°C was conducted. Subsequently, the combustion efficiency was evaluated at 850-925°C. Results shows the conversion of FCA3112 oxygen carriers increased when the reaction temperature is increased. On the other hand, the optimal reaction temperature is at 925°C for FCA3112 oxygen carriers.
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