Investigation for energy state of zeolites

沸石能量状态的研究

• 批准号: 12640468
• 负责人: MIZOTA Tadato
• 金额: $ 2.18万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640468/
• 关键词: zeolite; water; hydration enthalpy; entropy; hydration; vapor pressure; LTA; CHA; ゼオライト水; ヒートポンプ; 水蒸気圧

Cyclic operation of a zeolite-water heat pump has been done successfully, and clarified that water molecule in zeolite, zeolitic water, as an independent component has very large heat capacity as much as almost twice of that of pure water which has the largest specific heat capacity of materials. Enthalpy increment of zeolitic water by heating from 25℃ to 100℃ was 10.6kJ per one mole of H_2O, whereas that of pure water is 5.25kJ. The calculation was done based on an ideal case without dehydration of zeolite during heating, as the real heating accompanies dehydration by 3-4% up to 100℃, when the zeolite is under the vapor pressure equilibrated with water at 25℃. As the enthalpy values of hydration is rater constant to be -65kJ/mol for various hydration levels of Mg53-A zeolite, the value is thought to be almost equal to the differential enthalpy. This proves that the large heat capacity reflects the nature of the zeolitic water in the void of the zeolite, that is, drastic- energetic change of zeolitic water there. The fact supports the unique function of the zeolite-water heat pump system for effective use of low temperature heat sources. The low entropy of zeolitic water was proved also by the experiment of equilibrium vapor pressure-temperature relations. Crystal structures of chabazite as well as the sites of water molecule were analyzed by X-ray single crystal structure analyses of both the raw chabazite and the dehydrated sample.

沸石 - 水热泵的循环操作已成功完成，并澄清说，作为独立的沸石水分子，具有非常大的热容量，几乎是具有最大材料的最大热容量的纯净水的两倍。通过从25℃到100的加热沸水的焓增量为每一个分子H_2O为10.6kJ，而纯水为5.25kj。计算是基于理想情况而没有在加热过程中脱水的理想情况下进行的，因为当沸石在蒸气压在25℃时，实际加热涉及脱水3-4％，最高100°。由于对于Mg53 -A沸石的各种水合水平，水合的焓值恒定为-65kJ/mol，因此该值被认为几乎等于差异焓。这证明了大热容量反映了沸石中沸石的性质，即在那里的沸石水的急剧变化。该事实支持沸石 - 水热泵系统的独特功能，可有效使用低温热源。同等蒸气压 - 温度关系的实验也证明了沸石水的低熵。通过X射线单晶体结构分析，对原始的千山力岩和脱水样品进行了X射线单晶结构分析，分析了甲虫的晶体结构以及水分子的位点。

项目成果

Suzuki, M., Maeda, M., Mizota: "Hydration enthalpies of inorganic porous materials with different structures"Mineralogical Journal. 22[1]. 1-10 (2000)

Suzuki, M.、Maeda, M.、Mizota：“不同结构的无机多孔材料的水合焓”矿物学杂志。

鈴木 正哉, 大橋 文彦, 犬飼 恵一, 前田 雅喜, 渡村 信治, 溝田 忠人: "アロフェン・イモゴライトの水和エンタルピー測定と熱交換材としての評価"J.Cer.Soc.of Japan. 109[8]. 681-685 (2001)

Masaya Suzuki、Fumihiko Ohashi、Keiichi Inukai、Masayoshi Maeda、Shinji Watanmura、Tadato Mizota：“水铝英石伊毛缟石水合焓的测量及其作为热交换材料的评价”J.Cer.Soc.of Japan 109[8] .681-。 685（2001）

溝田 忠人: "ゼオライトヒートポンプ"日本エネルギー学会誌. 80(10). 916-923 (2001)

Tadato Mizota：“沸石热泵”日本能源研究所杂志 80(10) (2001)。

N.Petrova, T.Mizota, and K.Fujiwara: "Hydration heats of zeolites for evaluation of heat exchangers"J. of Therm. Anal. Calor. Vol.64. 211-217 (2001)

N.Petrova、T.Mizota 和 K.Fujiwara：“用于评估热交换器的沸石水合热”J。

鈴木正哉, 大橋文彦, 犬飼恵一, 前田雅喜, 渡村信治, 溝田忠人: "アロフェン・イモゴライトの水和エンタルピー測定と熱交換材としての評価"J. Cer. Soc. of Japan. 109[8]. 681-685 (2001)

Masaya Suzuki、Fumihiko Ohashi、Keiichi Inukai、Masaki Maeda、Shinji Watanura、Tadato Mizota：“水铝英石伊毛缟石的水合焓的测量及其作为热交换材料的评估”J. Cer 109[8] .681-。 685（2001）