ピンボール 木の豆ミックス2

Journal of the Hydrogen Energy Systems Society of Japan
Online ISSN : 2436-5599
Print ISSN : 1341-6995
Volume 33, Issue 4
Displaying 1-16 of 16 articles from this issue
  • [in Japanese]
    2008 Volume 33 Issue 4 Pages 1
    Published: 2008
    Released on J-STAGE: July 21, 2022
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    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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  • Yasukazu SAITO
    2008 Volume 33 Issue 4 Pages 2-7
    Published: 2008
    Released on J-STAGE: July 21, 2022
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    Hydrogen is an important energy-carrier because of its potential merits on storage and transportation in contrast to electricity, notwithstanding explosive reactiveties of molecular hydrogen in air. Renewable energies are congenial to chemicals in order to overcome their weak points of diffusiveness and unsteadiness. Organic-hydride carriers are suited especially to oversea-transport of large-scale wind energy, which is blessed, for example, in Patagonia or Alaska. Since organic hydrides can provide hydrogen catalytically at the temperatures of waste heats, the blast furnace in ironworks or ICE automobile on-boarded would economize cokes or car-fuels through hydrogen-added combustion. Chemical recuperation of waste heats, accompanying CO2 reduction, would open a way toward the low-carbon society.

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  • Yoshimi OKADA, Masashi SAITO, Nobuhiro Onda, Junichi Sakaguchi
    2008 Volume 33 Issue 4 Pages 8-12
    Published: 2008
    Released on J-STAGE: July 21, 2022
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    Chiyoda Corporation has been proposed a vision of the global hydrogen supply chain. It is considered the vision will great service to the reduction of CO2 emission. We are also developing the hydrogen storage and transportation system for the huge amount and a long distance by the organic chemical hydride (OCH) method. We had reported the status of the development of the dehydrogenation catalyst for the fix bed reactor in the laboratory scale. In this report, the global hydrogen supply chain and the feature of the system are introduced.

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  • Naotsugu ITOH
    2008 Volume 33 Issue 4 Pages 13-19
    Published: 2008
    Released on J-STAGE: July 21, 2022
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    Liquid chemical hydrides like cyclohexane etc. are considered to be suitable for hydrogen storage and transport, in which the efficient hydrogen production by dehydrogenation is the most important step. The membrane reactors can realize enhancing the equilibrium-limited reactions as well as recovering the purified hydrogen.

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  • Yoshitsugu KOJIMA, Masami TSUBOTA, Takayuki ICHIKAWA
    2008 Volume 33 Issue 4 Pages 20-25
    Published: 2008
    Released on J-STAGE: July 21, 2022
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    Ammonia NH3 has a number of favorable attributes, the primary one being its high capacity for hydrogen storage, 18 mass% on its molecular weight. And it is easily liquefied by compression of about 1 MPa at room temperature, which leads an easy handling for the practical use. In this review, general properties, syntheses and present decomposition methods of ammonia are briefly described. And new concept of ammonia decomposition, reaction with alkali metal hydrides is demonstrated. Furthermore, combination of the ammonia-absorbing metal ammine and the metal hydride, composite systems are investigated.

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  • Atsushi Segawa, Takao Ishikawa
    2008 Volume 33 Issue 4 Pages 26-31
    Published: 2008
    Released on J-STAGE: July 21, 2022
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    The organic hydride system is one of the important hydrogen transportation methods. This paper describes our study of the hydrogen generation and the efficiency of a vehicle with an on-board hydrogen supply system based on a micro reactor that reforms organic hydride. In order to achieve a compact hydrogen supply system able to generate sufficient quantities of hydrogen, we have developed a membrane reactor combined with a chlorine-free catalyst. The 10-15 mode test cycle simulation results show that the micro reactor can generate hydrogen with high responsiveness. Life cycle assessment (well-to-wheel) of the fuel supply for vehicles using organic hydride shows that, using a micro reactor and by recovering the engine’s waste heat, the efficiency of on-board systems improves. Consequently, the authors conclude that vehicles using organic hydride with micro reactor systems can be as efficient as vehicles using high-pressure hydrogen.

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  • Masahiro INOUE, Hisayoshi TSUKIKAWA, Hiroshi KANAYAMA, Kazuo MATSUURA
    2008 Volume 33 Issue 4 Pages 32-43
    Published: 2008
    Released on J-STAGE: July 21, 2022
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    Hydrogen ignites by a small energy that is almost one tenth of that for methane which is the main substance of town gas. The combustion range of the hydrogen-air mixture is very wide as between 4 to 74 %. Also hydrogen is leaky and the combustion speed is very high. Therefore, the knowledge of the safety of hydrogen is indispensable for the broad usage of hydrogen energy in our civil life.

    The purpose of this study is to increase the safety in a space where hydrogen is really used. A series of experiments was carried out using a model to understand the hydrogen dispersion behavior when hydrogen leaked in a partially open space such as a room, a basement car park, and a passage. It was found how the hydrogen flows from its source to outside and how the concentration changes with height and time. The effects of the inclination of the ceiling were also observed.

    There was another purpose in the experiments. Recently, CFD analysis method is widely used to examine the behavior of leaked hydrogen. However it seems that many of them were not examined the accuracy itself comparing with the reliable actual data. The reason is thought that there are few reliable experimental results which can be used to validate the accuracy. A lot of effort was paid to get accurate hydrogen concentration data from the experiments to provide the reliable results.

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  • Katsutoshi Sato, Sho Fukuda, Syota Nakashiki, Katsutoshi Nagaoka, Hiro ...
    2008 Volume 33 Issue 4 Pages 44-48
    Published: 2008
    Released on J-STAGE: July 21, 2022
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    Oxidative reforming of n-butane is triggered rapidly and repeatedly on reduced CeO2 supported Rh catalysts from ambient temperature without heating the catalyst externally. The auto ignition is enabled by the heat produced by spontaneous oxidation of the catalytic support, i.e., CeO2-x to CeO2. The highly localized heat produced by oxidation of CeO2-x starts combustion and subsequent reforming of n-butane.

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  • Yoshitsugu Kojima
    2008 Volume 33 Issue 4 Pages 49-58
    Published: 2008
    Released on J-STAGE: July 21, 2022
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    The fuel tanks for the fuel cell vehicles (FCVs) are large compared to those for gasoline vehicles. It is the biggest hurdle to FCVs and the downsizing is required for a new hydrogen storage system. Hydrogen can be stored in many different forms as compressed or liquefied hydrogen, or hydrogen storage materials. In this paper, I reviewed hydrogen storage properties of hydrogen-absorbing alloys with high dissociation pressure, light weight non-metallic hydrogen storage materials and carbon materials.

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  • 2008 Volume 33 Issue 4 Pages 59-62
    Published: 2008
    Released on J-STAGE: July 21, 2022
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  • [in Japanese]
    2008 Volume 33 Issue 4 Pages 63-66
    Published: 2008
    Released on J-STAGE: July 21, 2022
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  • 2008 Volume 33 Issue 4 Pages 67-70
    Published: 2008
    Released on J-STAGE: July 21, 2022
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  • 2008 Volume 33 Issue 4 Pages 71-74
    Published: 2008
    Released on J-STAGE: July 21, 2022
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  • 2008 Volume 33 Issue 4 Pages 75-78
    Published: 2008
    Released on J-STAGE: July 21, 2022
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  • 2008 Volume 33 Issue 4 Pages 79-82
    Published: 2008
    Released on J-STAGE: July 21, 2022
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  • 2008 Volume 33 Issue 4 Pages 83-84
    Published: 2008
    Released on J-STAGE: July 21, 2022
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