NDLI: The thermodynamic method for selecting oxygen carriers used for chemical looping air separation

Content Provider	Springer Nature Link
Author	Wang, Kun Yu, Qingbo Qin, Qin
Copyright Year	2012
Abstract	Chemical looping air separation (CLAS) has been suggested as a new and energy saving method for producing oxygen from air. The selection of suitable oxygen carriers is the key issue for CLAS system. This paper shows a comprehensive thermodynamic method for selecting oxygen carriers used for CLAS through studying the properties of 34 different oxygen releasing reactions referring to 18 elements at different temperatures. The research mainly includes analysis of oxygen releasing capacity by calculating the Gibbs free energy change (ΔG) and the equilibrium partial pressure of oxygen of the reduction or oxidation reaction at different temperatures. Oxygen content and transport capacity were calculated. The spontaneous reaction temperatures for oxygen releasing reactions were presented to determine the operating temperatures. Also, the minimum demand of the steam for the reduction reaction was discussed. On the basis of the comprehensive thermodynamic study, the oxide systems of CrO$_{2}$/Cr$_{2}$O$_{3}$, PbO$_{2}$/Pb$_{3}$O$_{4}$, PbO$_{2}$/PbO, Pb$_{3}$O$_{4}$/PbO, MnO$_{2}$/Mn$_{2}$O$_{3}$, and Ag$_{2}$O/Ag have been found suitable for the CLAS process in low temperatures (500–800 K). The systems of PdO$_{2}$/PdO, PdO$_{2}$/Pd, PdO/Pd, MnO$_{2}$/MnO, and MnO$_{2}$/Mn$_{3}$O$_{4}$ were suitable for medium temperatures (800–1100 K) CLAS process. And Co$_{3}$O$_{4}$/CoO, CuO/Cu$_{2}$O, Mn$_{2}$O$_{3}$/Mn$_{3}$O$_{4}$, and OsO$_{2}$/Os systems only worked successfully in high temperatures (1100–1400 K). In addition, the CaO$_{2}$/CaO system was not suitable for CLAS because of the reaction with steam. The various binders such as SiO$_{2}$, TiO$_{2}$, Al$_{2}$O$_{3}$, Y$_{2}$O$_{3}$, ZrO$_{2}$, and YSZ which have been used for CLC could also be the supports for CLAS oxygen carriers.
Starting Page	747
Ending Page	753
Page Count	7
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	112
Issue Number	2
e-ISSN	15728943
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-08-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chemical looping air separation Oxygen carrier Thermodynamic method Reaction temperature Binders Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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