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首页> 外文期刊>RSC Advances >Calcium hydroxide doped by KNO3 as a promising candidate for thermochemical storage of solar heat
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Calcium hydroxide doped by KNO3 as a promising candidate for thermochemical storage of solar heat

机译：KNO 3 掺杂的氢氧化钙有望用作太阳能热化学存储

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New materials for thermochemical storage of concentrated solar heat are highly desirable for making this emerging technology competitive with the traditional sensible and latent heat storage. Keeping this in mind, we have prepared calcium hydroxide modified with potassium nitrate and studied its de-/rehydration dynamics by differential scanning calorimetry and thermogravimetry techniques. The following notable observations are described for the modified Ca(OH)2: (1) an acceleration of the dehydration and reduction of its temperature as compared with the pure hydroxide; (2) the temperature reduction depends on the KNO3 content Y and reaches 35 °C at Y = 5 wt%; (3) the addition of KNO3 only slightly reduces the dehydration heat which remains promising for heat storage applications. Fast rehydration of the doped CaO is observed at T = 290–360 °C and P(H2O) = 23–128 mbar, and its rate strongly depends on both temperature and pressure. De- and rehydrated products were studied by the BET analysis and IR-spectroscopy to elucidate possible ways for the salt to influence the Ca(OH)2 dehydration. The mechanism involving a chemical interaction between the salt and the hydroxide is discussed. The new material exhibits a large heat storage density, fast de-/rehydration and adjustable decomposition temperature, and may be considered as a promising candidate for thermochemical storage of concentrated solar energy.
机译：为了使这项新兴技术与传统的显热和潜热存储技术竞争，人们迫切需要用于集中太阳能热化学存储的新材料。牢记这一点，我们制备了用硝酸钾改性的氢氧化钙，并通过差示扫描量热法和热重分析技术研究了其脱水/再水化动力学。对于改性的Ca（OH） 2 ，有以下值得注意的观察结果：（1）与纯氢氧化物相比，脱水加速，温度降低。 （2）温度降低取决于KNO 3 含量 Y ，在 Y = 5时达到35°C wt％; （3）添加KNO 3 只会稍微降低脱水热量，这对于蓄热应用仍然很有希望。在 T = 290–360°C和 P （H 2 O ）= 23–128 mbar，其速率在很大程度上取决于温度和压力。通过BET分析和红外光谱研究了脱水和再水化的产物，以阐明盐影响Ca（OH） 2 脱水的可能途径。讨论了涉及盐与氢氧化物之间化学相互作用的机理。这种新材料具有高的储热密度，快速的脱水/脱水和可调节的分解温度，并且可以被认为是集中太阳能热化学存储的有前途的候选者。

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