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Effect of Phase Change of MoO₃ on H₂ Spillover Kinetics over Pt/MoO₃
김진걸,김성수,유승준 한국수소및신에너지학회 2009 한국수소 및 신에너지학회논문집 Vol.20 No.4
수소가 Pt/MoO₃로 흡장되는 현상을 XRD, TEM, CO 화학흡착 분석방법을 사용하여 조사하였다. 소성과정은 Pt/MoO₃ 촉매의 Chlorine 함유량을 감소하며 박막을 형성하였다. 소성전과 비교하여 수 소 흡장량은 소성 후에 증가하였다. Orthorhombic Pt/MoO₃은 Hexagonal Pt/MoO₃보다 항상 수소 흡장 량이 증가하였다. 상대적으로 Hexagonal Pt/MoO₃에서 수소 흡장량이 감소하는 이유는 Hexagonal 결 정격자 내에 존재하는 NH4 + 이온에 기인하는 것으로 판단된다. 결정격자 내부로의 수소 침투시 암모 니움 이온이 수소내부 기공에 장애물 역할을 하므로, 수소 흡장량이 감소하는 것으로 판단된다
삼중수소 저장을 위한 ZrCo 저장재에서의 수소 흡장에 대한 수치해석적 연구 (I)
유하늘,윤세훈,장민호,강현구,주현철 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.5
In this paper, a three-dimensional hydrogen absorption model is applied to a thin double-layered annulus ZrCo hydride bed and validated against the temperature evolution data measured by Kang et al.1) The present model reasonably captures the bed temperature evolution behavior and the 99% hydrogen charging time. The equilibrium pressure expression for hydrogen absorption on ZrCo is derived as a function of temperature and the H/M atomic ratio based on the pressure-composition isotherm data given by Konishi et al.2) In addition, this present model provides multi-dimensional contours such as temperature and H/M atomic ratio in the thin doublelayered annulus metal hydride region. This numerical study provides fundamental understanding during hydrogen absorption process and indicates that efficient design of the metal hydride bed is critical to achieve rapid hydrogen charging performance. The present three-dimensional hydrogen absorption model is a useful tool for the optimization of bed design and operating conditions.
홍성현,배종수,나영상,송명엽,임창동 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.3
The eutectic Mg-23.5%Ni alloy was casted by melting and solidification. The powders of Mg-23.5%Ni and (Mg-23.5%Ni)-10% iron oxide were prepared by mechanical grinding of casted Mg-Ni alloy and casted Mg-Ni alloy+oxide, respectively. As milling time increases, hydriding and dehydriding rates of Mg-Ni and Mg-Ni-oxide alloy powders increase. The additions of iron oxide to Mg-Ni alloy and Mg-Ni-oxide increase hydriding rates and slightly decrease dehydriding rates.
금속수소화물 수소 저장 용기 내부의 수소흡장에 대한 수치해석적 연구
남진무,강경문,주현철 한국수소및신에너지학회 2010 한국수소 및 신에너지학회논문집 Vol.21 No.4
In this paper, a three-dimensional hydrogen absorption model is developed to precisely study hydrogen absorption reaction and resultant heat and mass transport phenomena in metal hydride hydrogen storage vessels. The 3D model is first experimentally validated against the temperature evolution data available in the literature. In addition to model validation, the detailed simulation results shows that at the initial absorption stage, the vessel temperature and H/M ratio distributions are uniform throughout the entire vessel, indicating that the hydrogen absorption is so efficient during the early hydriding process and thus local cooling effect is not influential. On the other hand, nonuniform distributions are predicted at the latter absorption stage,which is mainly due to different degrees of cooling between the vessel wall and core regions. This numerical study provides the fundamental understanding of detailed heat and mass transfer phenomena during hydrogen absorption process and further indicates that efficient design of storage vessel and cooling system is critical to achieve fast hydrogen charging and high hydrogen storage efficiency.
홍성현,배종수,임창동,나영상,송명엽,Hong, Seong-Hyeon,Bae, Jong-Soo,Yim, Chang-Dong,Na, Young-Sang,Song, Myoung-Youp 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.2
The eutectic Mg-23.5%Ni alloy was casted by melting and solidification. The powders of Mg-23.5%Ni and (Mg-23.5%Ni)-10% iron oxide were prepared by mechanical grinding of casted Mg-Ni alloy and casted Mg-Ni alloy+oxide, respectively. As milling time increases, hydriding and dehydriding rates of Mg-Ni and Mg-Ni-oxide alloy powders increase. The additions of iron oxide to Mg-Ni alloy and Mg-Ni-oxide increase hydriding rates and slightly decrease dehydriding rates.
구대서,김연진,윤세훈,정흥석 한국수소및신에너지학회 2016 한국수소 및 신에너지학회논문집 Vol.27 No.1
It is necessary to store and supply hydrogen isotopes for Tokamak operation. A storage and delivery system (SDS) is used for storing hydrogen isotopes as a metal hydride form. We designed and fabricated a depleted uranium (DU) bed to store hydrogen isotopes. The rapid storage of hydrogen isotopes is very important not only for safety reasons but also for the economic design and operation of the SDS. The delivery rate at the desorption temperatures without the operation of a dry pump was analyzed in comparison with that with the operation of the dry pump. The effect of the initial desorption temperatures on the dehydriding of the DU without the operation of the dry pump was measured. The effect of the initial desorption temperatures on the dehydriding of DU with the operation of the dry pump was also measured and analyzed. The primary pressure on the desorption temperatures without the operation of the dry pump was analyzed in comparison with that with the operation of the dry pump. The temperature gradient of the coil heater and the primary vessel was also analyzed. Our results will be used to develop pilot scale hydrogen isotope processes. It was confirmed that dehydriding of a medium-scale DU bed has enabled without the operation of the dry pump.
구대서,정흥석,정동유,이정민,윤세훈,조승연,정기정 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.1
Hydrogen isotopes accountancy and storage are important functions in a nuclear fusion fuel cycle. The hydrogen isotopes are safely stored in metal hydride beds. The tritium inventory of the bed is determined from the decay heat of tritium. The decay heat is measured by circulating helium through the metal hydride bed and measuring the resultant temperature increase of the helium flow. We are reporting our preliminary experimental results on the hydrogen isotopes accountancy and storage performance in a metal hydride bed.
김연진,정광진,구대서,박종철,전민구,유세훈,정흥석 한국수소및신에너지학회 2015 한국수소 및 신에너지학회논문집 Vol.26 No.6
Global energy shortage problem is expected to increase driven by strong energy demand growth from developing countries. Nuclear fusion power offers the prospect of an almost infinite source of energy for future generations. Hydrogen isotope storage and delivery system is a important subsystem of a nuclear fusion fuel cycle. Metal hydride is a method of the high-density storage of hydrogen isotope. For the safety storage of hydrogen isotope, depleted uranium (DU) has been widely proposed. But DU needs a safe test because It is a radioactive substance. The authors studied a small-scale DU bed and a medium-scale DU bed for the safety test. And then we made a large-scale DU bed and stored hydrogen isotopes in the bed. Before the hydriding/dehydriding, we tested it’s heating and cooling properties and carried out an activation procedure. As a result, Reaction rate of DU-H2 is more rapid than the other metal hydride ZrCo. Through the successful storage result of our large bed, the development possibility of the hydrogen isotope storage technology seems promising.