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On the use of metal cation-exchanged zeolites in sorption thermochemical storage: Some practical aspects in reference to the mechanism of water vapor adsorption
Solar Energy Materials and Solar Cells ( IF 6.9 ) Pub Date : 2018-06-01 , DOI: 10.1016/j.solmat.2017.11.020
Delhia Alby , Fabrice Salles , Julien Fullenwarth , Jerzy Zajac

Abstract The sodium form of industrial X-zeolite (13X) was compared with two other samples obtained by a partial (about 70%) cation exchange with Mg2+ (Mg-X) or a complete exchange with Ca2+ (Ca-X) in view of their use as adsorbents for water vapor in energy storage systems by sorption. Various sorption methods based on the specific interactions between two probing molecules (N2 and NH3) and specific surface sites were employed to monitor the hydration state of the zeolite surface as a function of the temperature of sample drying performed under vacuum degassing or gas-flow conditions. X-ray diffraction, volumetric sorption technique, temperature-programmed desorption, and gas flow calorimetry were combined with Monte Carlo simulations of the mechanism of water vapor adsorption on model zeolites to demonstrate that the general tendency to operate under mild drying conditions would always result in a state of partial hydration of the zeolite surface. To increase the amount of heat released upon subsequent adsorption from a flow of helium at a relative pressure of water vapor of about 0.03, the use of Mg-X sample was demonstrated the best alternative if the activation procedure was to be performed at 200 °C. Here, the heat effect was 4–5 times greater than that measured in the case of 13X. This result is of high importance for the industrial-scale implementation of the energy storage by sorption.

中文翻译:

金属阳离子交换沸石在吸附热化学储存中的应用:参考水蒸气吸附机理的一些实用方面

摘要 将工业 X-沸石 (13X) 的钠形式与通过与 Mg2+ (Mg-X) 部分(约 70%)阳离子交换或与 Ca2+ (Ca-X) 完全交换获得的其他两种样品进行比较通过吸附将它们用作能量存储系统中水蒸气的吸附剂。基于两个探测分子(N2 和 NH3)和特定表面位点之间的特定相互作用的各种吸附方法被用来监测沸石表面的水合状态作为在真空脱气或气流条件下进行的样品干燥温度的函数. X 射线衍射、体积吸附技术、程序升温脱附、和气流量热法与模型沸石上水蒸气吸附机理的蒙特卡罗模拟相结合,以证明在温和干燥条件下操作的一般趋势总是会导致沸石表面部分水合的状态。为了增加在水蒸气相对压力为 0.03 左右的氦流中随后吸附时释放的热量,如果要在 200 °C 下进行活化程序,则证明使用 Mg-X 样品是最佳选择. 在这里,热效应是 13X 情况下测量的热效应的 4-5 倍。该结果对于通过吸附实现储能的工业规模实施具有重要意义。为了增加在水蒸气相对压力为 0.03 左右的氦流中随后吸附时释放的热量,如果要在 200 °C 下进行活化程序,则证明使用 Mg-X 样品是最佳选择. 在这里,热效应是 13X 情况下测量的热效应的 4-5 倍。该结果对于通过吸附实现储能的工业规模实施具有重要意义。为了增加在水蒸气相对压力为 0.03 左右的氦流中随后吸附时释放的热量,如果要在 200 °C 下进行活化程序,则证明使用 Mg-X 样品是最佳选择. 在这里,热效应是 13X 情况下测量的热效应的 4-5 倍。该结果对于通过吸附实现储能的工业规模实施具有重要意义。
更新日期:2018-06-01
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