| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 102 === The CuO/ZrO2 (CZ230-S1) oxygen carriers used in this study was prepared by mechanical mixing. The reduction and oxidization kinetics of CZ230-S1 oxygen carriers were evaluated by the solid-state reaction mechanism models. Based on the assumptions of the reaction mechanism models and experimental data acquired by TGA, the reaction mechanism models, kinetics parameters and activation energy were obtained in both reduction and oxidization of CZ230-S1 oxygen carriers. The TGA experiments also proved that the reaction temperature influenced not only the reaction rate constant, k, but also the driving force in both reduction and oxidization of CZ230-S1 oxygen carriers. The kinetics analysis indicated that the reduction and oxidization of CZ230-S1 oxygen carriers can be described as Geometrical Contraction model and Avrami-Erofeyev model, respectively.
Furthermore, the feasibility of the chemical looping with air separation (CLAS) process was investigated in the moving bed reactor; the oxygen concentration and oxygen production rate can be adjusted by varying the reaction temperatures, the feeding rate of oxygen carrier and the flow rate of carrier gas. SEM images verified that no agglomeration of CZ230-S1 oxygen carriers was observed after CLAS process. As demonstrated in TGA analysis, the reactivity and recyclability of the oxygen carrier had no significant change after 50 redox cycles, indicating that CZ230-S1 oxygen carriers are preliminary validated as oxygen carriers for CLAS process.
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