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添加锂化合物对作为化学蓄热材料的氢氧化钙脱水和水化的影响。

Effect of Lithium Compound Addition on the Dehydration and Hydration of Calcium Hydroxide as a Chemical Heat Storage Material.

作者信息

Maruyama Aya, Kurosawa Ryo, Ryu Junichi

机构信息

Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.

出版信息

ACS Omega. 2020 Apr 21;5(17):9820-9829. doi: 10.1021/acsomega.9b04444. eCollection 2020 May 5.

DOI:10.1021/acsomega.9b04444
PMID:32391469
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7203692/
Abstract

Many studies on calcium hydroxide [Ca(OH)] as a chemical heat storage material have been conducted. Generally, calcium hydroxide undergoes a dehydration reaction (heat storage operation) efficiently at about 400 °C or higher. In this study, we aimed to lower the dehydration reaction temperature and increase the dehydration reaction rate to expand the applicability of calcium hydroxide as a chemical heat storage material. For the purpose of improving the dehydration reactivity, calcium hydroxide with added lithium compounds was prepared, and the dehydration/hydration reactivities were evaluated. From the results, it was confirmed that the addition of the lithium compounds lowered the dehydration reaction temperature of calcium hydroxide and enhanced the reaction rate. The dehydration reaction of Ca(OH) with Li compounds proceeded efficiently even at 350 °C, and the reversibility of the dehydration/hydration reaction was confirmed. The reason for the improvement of the calcium hydroxide dehydration reactivity upon the addition of a lithium compound was examined from the viewpoint of its crystal structure. It was presumed that when lithium ions enter the calcium hydroxide crystals, the crystals became fragile and the dehydration reaction was accelerated.

摘要

关于氢氧化钙[Ca(OH)]作为化学蓄热材料，已经开展了许多研究。一般来说，氢氧化钙在约400℃或更高温度下能高效地进行脱水反应（蓄热操作）。在本研究中，我们旨在降低脱水反应温度并提高脱水反应速率，以扩大氢氧化钙作为化学蓄热材料的适用性。为了提高脱水反应活性，制备了添加锂化合物的氢氧化钙，并对其脱水/水合反应活性进行了评估。结果表明，锂化合物的添加降低了氢氧化钙的脱水反应温度并提高了反应速率。即使在350℃时，Ca(OH)与锂化合物的脱水反应也能高效进行，并且证实了脱水/水合反应的可逆性。从晶体结构的角度研究了添加锂化合物后氢氧化钙脱水反应活性提高的原因。据推测，当锂离子进入氢氧化钙晶体时，晶体会变得易碎，从而加速脱水反应。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa58/7203692/9aa5286bde4c/ao9b04444_0009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa58/7203692/9aa5286bde4c/ao9b04444_0009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa58/7203692/21afa4c83be6/ao9b04444_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa58/7203692/34a326a080aa/ao9b04444_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa58/7203692/bdd93f3a8a50/ao9b04444_0003.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa58/7203692/17abdd501a42/ao9b04444_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa58/7203692/526376d5e390/ao9b04444_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa58/7203692/2141e8186176/ao9b04444_0007.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa58/7203692/9aa5286bde4c/ao9b04444_0009.jpg

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本文引用的文献

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3
Synthesis of Me Doped Mg(OH)₂ Materials for Thermochemical Heat Storage.
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Nanomaterials (Basel). 2018 Jul 26;8(8):573. doi: 10.3390/nano8080573.