Carrillo Alfonso J, Serrano David P, Pizarro Patricia, Coronado Juan M
Thermochemical Processes Unit, IMDEA Energy Institute, Avenida Ramón de la Sagra 3, 28935 Móstoles (Spain), Fax: (+34) 91-737-11-40.
Chemical and Environmental Engineering Group, ESCET, Rey Juan Carlos University c/Tulipán s/n, 28933, Móstoles (Spain).
ChemSusChem. 2015 Jun 8;8(11):1947-54. doi: 10.1002/cssc.201500148. Epub 2015 Apr 29.
Redox cycles of manganese oxides (Mn2 O3 /Mn3 O4 ) are a promising alternative for thermochemical heat storage systems coupled to concentrated solar power plants as manganese oxides are abundant and inexpensive materials. Although their cyclability for such a purpose has been proved, sintering processes, related to the high-temperature conditions at which charge-discharge cycles are performed, generally cause a cycle-to-cycle decrease in the oxidation rate of Mn3 O4 . To guarantee proper operation, both reactions should present stable reaction rates. In this study, it has been demonstrated that the incorporation of Fe, which is also an abundant material, into the manganese oxides improves the redox performance of this system by increasing the heat storage density, narrowing the redox thermal hysteresis, and, above all, stabilizing and enhancing the oxidation rate over long-term operation, which counteracts the negative effects caused by sintering, although its presence is not avoided.
氧化锰（Mn2O3/Mn3O4）的氧化还原循环是与聚光太阳能发电厂耦合的热化学蓄热系统的一种有前景的替代方案，因为氧化锰是丰富且廉价的材料。尽管其用于此目的的循环性已得到证明，但与进行充放电循环的高温条件相关的烧结过程通常会导致Mn3O4的氧化速率逐循环下降。为确保正常运行，两个反应都应具有稳定的反应速率。在本研究中，已证明将同样丰富的铁掺入氧化锰中，可通过提高蓄热密度、缩小氧化还原热滞回，最重要的是在长期运行中稳定并提高氧化速率来改善该系统的氧化还原性能，这抵消了烧结造成的负面影响，尽管铁的存在无法避免。
