低品位蓄热用LiCl·H2O-γ-Al2O3复合材料的性能研究,RSC Advances

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低品位蓄热用LiCl·H2O-γ-Al2O3复合材料的性能研究
RSC Advances ( IF 3.9 ) Pub Date : 2023-08-22 , DOI: 10.1039/d3ra03835a
Lin Li _{1,

2} , Tao Zeng _{1,

3} , Hongyu Huang ₁ , Jun Li ₁ , Noriyuki Kobayshi ₄ , Xiaohu Yang ₃

Affiliation

_{本研究通过实验研究了纳米γ-Al 2} O ₃对LiCl蓄热性能的影响。XRD结果表明，通过LiCl·H ₂ O与γ-Al ₂ O ₃复合材料的制备过程，形成了氯氧化锂铝(LiAlOCl _{2 )的配合物。}原位漫反射红外傅里叶变换光谱测量表明，γ-Al ₂ O ₃的加入加速了LiCl复合材料的水化速率，集中了光谱利用范围，促进了物理吸附H ₂ O和低频的解吸速率。材料中的结构-OH。该复合材料的最高比表面积比纯LiCl高34.5倍。在水合时间1 h、γ-Al ₂ O ₃添加量为15 wt%时，γ-Al ₂ O _{3的添加可使LiCl·H}₂ O的转化率提高至100%左右。当γ-Al ₂ O _{3的添加量为一定浓度时，LiCl·H}₂ O-γ -Al ₂ O ₃复合材料在1 h内的最大蓄热密度(HSD)可达714.7 kJ kg _LiCl·H_₂_O^-1 。 15% _wt ， 1 h吸水量可达0.26 gg ^{-1 。}还可以发现，LiCl中添加Al ₂ O ₃导致活化能从90.89 kJ mol ^-1降低至79.76 kJ mol ^-1。_{然而，随着纳米γ-Al 2} O _{3含量的增加，LiCl·H}₂ O-γ -Al ₂ O ₃复合材料的导热系数略有下降。

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Performance investigation of LiCl·H2O-γ-Al2O3 composite materials for low-grade heat storage

In this study, the influences of nano γ-Al₂O₃ on the thermal storage performance of LiCl were experimentally investigated. The XRD results show that a complex of lithium aluminium oxychloride (LiAlOCl₂) was formed through the LiCl·H₂O and γ-Al₂O₃ composites preparation process. The in situ diffuse reflectance infrared Fourier transform spectroscopy measurement reveals that the addition of γ-Al₂O₃ accelerated the hydration rate of LiCl composites, concentrated the spectrum utilization range, and promoted the desorption rate of physical adsorbed H₂O and low-frequency structural –OH in the materials. The highest specific surface area of the composite is 34.5 times higher than that of pure LiCl. The addition of γ-Al₂O₃ can increase the conversion rate of LiCl·H₂O to approximately 100% at the hydration time of 1 h and the addition content of γ-Al₂O₃ at 15 wt%. A maximum heat storage density (HSD) for the LiCl·H₂O-γ-Al₂O₃ composite can reach 714.7 kJ kg_LiCl·H₂O⁻¹ in 1 h when the addition content of γ-Al₂O₃ was 15%_wt and its water uptake can reach 0.26 g g⁻¹ in 1 h. It also can be found that the addition of Al₂O₃ in LiCl resulted in a decrease of the activation energy from 90.89 kJ mol⁻¹ to 79.76 kJ mol⁻¹. However, the thermal conductivity of the LiCl·H₂O-γ-Al₂O₃ composite slightly decreased with the increase of nano γ-Al₂O₃ content.

更新日期：2023-08-22

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