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Reduction Kinetics of Cu-Based Oxygen Carriers for Chemical Looping Air Separation

The knowledge of the kinetics of oxygen carriers is essential for the design of chemical looping air separation (CLAS) system. In this paper, the Cu-based oxygen carriers were prepared via a mechanical mixing method, and ZrO2, TiO2, and SiO2 were used as binder. The kinetics of the oxygen carriers in the process was determined using the distributed activation energy model via the thermogravimetry (TG) technique. TG experiments were performed in a thermal analyzer with heating rates of 5, 10, 15, and 20 °C/min. Preparation experiments were carried out first to obtain suitable sample masses and gas flow rates, to eliminate the effects of internal and external diffusion. The TG results show that the oxygen reduction and oxidation all have high reaction rates. The reaction rates of using different binders increase in the order of ZrO2 > TiO2 > SiO2, but the differences are minor. Besides the start and end points, the peaks of differential thermogravimetry (DTG) curves of oxygen-releasing regions all move forw...

Authors:   Kun Wang; Qingbo Yu; Qin Qin
Journal:   Energy & Fuels
Year:   2013
DOI:   10.1021/ef401241r
Publication date:   14-Aug-2013
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