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纯氧化镁和化学改性氧化镁水合反应的傅里叶变换红外光谱及X射线衍射分析

Fourier-transform infrared and X-ray diffraction analyses of the hydration reaction of pure magnesium oxide and chemically modified magnesium oxide.

作者信息

Kurosawa Ryo, Takeuchi Masato, Ryu Junichi

机构信息

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

Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University 1-1, Gaku-en-cho, Naka-ku Sakai Osaka 599-8531 Japan.

出版信息

RSC Adv. 2021 Jul 9;11(39):24292-24311. doi: 10.1039/d1ra04290d. eCollection 2021 Jul 6.

DOI:10.1039/d1ra04290d
PMID:35479034
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9039418/
Abstract

The magnesium hydroxide/magnesium oxide (Mg(OH)/MgO) system is a promising chemical heat storage system that utilizes unused heat at the temperature range of 200-500 °C. We have previously reported that the addition of lithium chloride (LiCl) and/or lithium hydroxide (LiOH) promotes the dehydration of Mg(OH). The results revealed that LiOH primarily catalyzed the dehydration of the surface of Mg(OH), while LiCl promoted the dehydration of bulk Mg(OH). However, the roles of Li compounds in the hydration of MgO have not been discussed in detail. X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) techniques were used to analyze the effects of adding the Li compounds. The results revealed that the addition of LiOH promoted the diffusion of water into the MgO bulk phase and the addition of LiCl promoted the hydration of the MgO bulk phase. It was also observed that the concentration (number) of OH affected hydration. The mechanism of hydration of pure and LiCl- (or LiOH)-added MgO has also been discussed.

摘要

氢氧化镁/氧化镁（Mg(OH)/MgO）体系是一种很有前景的化学蓄热体系，可利用200 - 500°C温度范围内的废热。我们之前报道过，添加氯化锂（LiCl）和/或氢氧化锂（LiOH）可促进Mg(OH)的脱水。结果表明，LiOH主要催化Mg(OH)表面的脱水，而LiCl促进块状Mg(OH)的脱水。然而，锂化合物在MgO水合作用中的作用尚未详细讨论。采用X射线衍射（XRD）和傅里叶变换红外（FT-IR）技术分析添加锂化合物的影响。结果表明，添加LiOH促进了水向MgO体相的扩散，添加LiCl促进了MgO体相的水合作用。还观察到OH的浓度（数量）影响水合作用。此外，还讨论了纯MgO以及添加LiCl（或LiOH）的MgO的水合作用机理。

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