Development of adiabatic calorimetry system for enthalpy of gas absorption/adsorption and its application to H2/D2 absorption into palladium nanoparticles

被引：5
作者：
Akiba, Hiroshi [1 ]
Hashimoto, Naoki [1 ]
Kofu, Maiko [1 ,3 ]
Kobayashi, Hirokazu [2 ]
Kitagawa, Hiroshi [2 ]
Yamamuro, Osamu [1 ]
机构：
[1] Univ Tokyo, Inst Solid State Phys, 5-1-5 Kashiwartoha, Kashiwa, Chiba 2778581, Japan
[2] Kyoto Univ, Grad Sch Sci, Dept Chem, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan
[3] J PARC Ctr, Mat & Life Sci Div, Tokai, Ibaraki 3191195, Japan
来源：
THERMOCHIMICA ACTA | 2018年 / 670卷
基金：
日本科学技术振兴机构;
关键词：
Adiabatic calorimetry; Enthalpy of hydrogen absorption; Pd nanoparticle; Isotope effect; THERMODYNAMIC PROPERTIES; HYDROGEN; ADSORPTION; HEATS; TRANSITION; DEUTERIUM; ENERGIES; NITROGEN; SITES; ARGON;
D O I：
10.1016/j.tca.2018.10.013
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
We have developed a new adiabatic calorimetry system for enthalpy of gas absorption/adsorption process. The sample cell is designed to be extremely small as a calorimeter cell with a resistance thermometer; mass: 4.34 g, inner volume: 1.06 cc. A thin stainless steel tube is connected at the lid of the cell to introduce a gas. A gas handling system was also constructed to introduce a gas slowly and measure the amounts of the absorbed/adsorbed gas precisely via a pVT method. As the first work on this system, we measured the enthalpies of H-2/D-2 absorption into Pd nanoparticles with an average diameter of ca. 8 nm. The obtained values are Delta H-abs (H) = -(18.15 +/- 0.87) kJmol(-1) and Delta absH(D) = -(18.17 +/- 0.38) kJmol(-1) at 298 K. These values are considerably smaller than those of bulk Pd. The isotope effect are discussed semi-quantitatively on the basis of the potential energy surfaces at the H/D sites.
引用
收藏
页码：87 / 91
页数：5
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