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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean hydrogen and new energy society
Journal Basic Information
Journal DOI :
The Korean Hydrogen and New Energy Society
Editor in Chief :
Volume & Issues
Volume 16, Issue 4 - Dec 2005
Volume 16, Issue 3 - Sep 2005
Volume 16, Issue 2 - Jun 2005
Volume 16, Issue 1 - Mar 2005
Selecting the target year
Performance Estimation and Process Selection for Chemical-Looping Hydrogen Generation System
Ryu, Ho-Jung ; Jin, Gyoung-Tae ;
Transactions of the Korean hydrogen and new energy society, volume 16, issue 3, 2005, Pages 209~218
To find a suitable metal component in oxygen carrier particles for chemical-looping hydrogen generation system(CLH), oxygen transfer capacities of metal components were compared and Ni has been selected as the best metal component. The proper operating conditions to achieve high hydrogen generation rate have been investigated based on the chemical-equilibrium composition analysis for water splitting reactor. Moreover, suitable compositions of syngas from gasifier of heavy residue to achieve high energy efficiency have been investigated by calculation of heat of reaction. Based on the selected operating conditions, the best configuration of two interconnected fluidized beds system for the chemical-looping hydrogen generator has been investigated as well.
Comparison of hydrogenases prepared from Clostridium butyricum and Thiocapsa roseopersicina
Baek, Jin-Sook ; Yun, Young-Su ; Kim, Mi-Sun ;
Transactions of the Korean hydrogen and new energy society, volume 16, issue 3, 2005, Pages 219~228
Fermentative strict anaerobic bacterium, Clostricium butyricum NCIB 9576 (Cl. butyricum) and purple sulfur phototrophic bacterium, Thiocapsa roseopersicina NCIB 8347 (T. roseopersicina) were compared on their temperature and oxygen stabilities of cytoplasmic hydrogenases. Cell growth phase and the specific activities of evolution
were related for both strains, exhibiting the highest cytoplasmic
activities during the logarithmic growth phases which were 4 and 18 hrs after the incubation for Cl. butyricum and T. roseopersicina, respectively. The optimum temperatures for the growth of Cl. butyricum and T. roseopersicina were 37
, respectively, while those for
evolution of cytoplsmic hydrogenases prepared from Cl. butyricum (
) and T. roseopersicina (
) were 45
was more thermo-stable than
retained its full activity for 5 hrs at 50
and retained 90% of its original activity for 5 hrs at 60
lost its activity drastically at 50
. The optimum pHs for
were 9.0 and 7.5 respectively. The both enzymes showed maximum
evolution activity at pH 7.0. Under the aerobic condition, 80% of
activity was retained for 10 hrs at 30
, and 50% of activity was still remained after 6 days at the same experimental conditions. But the
was labile to oxygen and lost its activity immediately after the exposure to air.
A Numerical Study on a High-Temperature Air Combustion Burner for a Compact Fuel-Cell Reformer
Lee, Kyoung-Ho ; Kwon, Oh-Chae ;
Transactions of the Korean hydrogen and new energy society, volume 16, issue 3, 2005, Pages 229~237
A new burner configuration for a compact fuel-cell reformer with a high-temperature air combustion concept was numerically studied. The burner was designed for a 40
hydrogen-generated reformer using natural gas-steam reforming method. In order to satisfy the primary requirements for designing a reformer burner (uniform distribution of temperature along the fuel processor walls and minimum heat losses from the reformer), the features of the present burner configuration included 1) a self-regenerative burner for an exhaust-gas-recirculation to apply for the high-temperature air combustion concept, and 2) an annular-type shield for protecting direct contact of flame with the processor walls. For the injection velocities of the recirculated gas of 0.6-2.4 m/s, the recirculated gas temperature of 1000 K, and the recirculated oxygen mole fraction of 4%, the temperature distributions along the processor walls were found uniform within 100 K variation. Thus, the present burner configuration satisfied the requirement for reducing temperature gradients along the processor walls, and consequently demonstrated that the high-temperature air combustion concept could be applied to the practical fuel reformers for use of fuel cells. The uniformity of temperature distribution is enhanced as the amount of the recirculated gas increases.
Evaluations of Microstructure and Hydrogenation Properties on
Seok, Song ; Shin, Kyung ; Kweon, Soon-Yong ; Ur, Soon-Chul ; Lee, Young-Geun ; Hong, Tae-Whan ;
Transactions of the Korean hydrogen and new energy society, volume 16, issue 3, 2005, Pages 238~243
Mg and Mg-based alloys are most important hydrogen storage materials. It is a lightweight and low-cost materials with high hydrogen storage capacity. However, the formation of hydride at high temperature, the deterioration effect, the hydriding and dehydriding kinetics are bad factor for application. In this study, Mg and Ni have been produced by hydrogen induced mechanical alloying(HIMA) process. The raw materials, Mg(purity 99.9%) chip and Ni(purity 99.95%) chip was prepared by using a planetary ball mill apparatus(FRITSCH pulverisette 5). The balls to chips mass ratio(BCR) are 30:1. The hydrogen pressure induced 2.0MPa and milling times were 12, 24, 48, 72, 96 hours with a rotating speed of 200rpm. X-ray diffraction(XRD) analysis was made to characterize the crystallite size and misfit strain. The crystallite size measured by laser particle size analysis(PSA). Microstructure changes were investigated by scanning electron microscopy(SEM) and the transmission electron microscopy(TEM). The hydrogen storage properties were evaluated by using an Sivert's type automatic pressure-composition-therm(PCT) apparatus.
Thermodynamics of Hydrogen-Induced Phase Separation on Pd-Co Alloys
Song, D.M. ; Park, C.N. ; Choi, J. ;
Transactions of the Korean hydrogen and new energy society, volume 16, issue 3, 2005, Pages 244~252
It is very interesting and important in the academic point of view and in practical use the hydrogen-induced phase separation(HIPS) which appears during hydrogen heat treatment. Since hydrogen can be removed very fast by pumping it out the hydrogen-induced new lattice phase which can not be obtained without hydrogen can be preserved as meta-stable state. In this study it has been investigated whether the HIPS appear in Pd-Al, Pd-Co, Pd-Cr, Pd-Ti, Pd-V and Pd-Zr alloys and discussed thermodynamic representation of the HIPS. The Pd alloys were arc-melted under argon atmosphere and remelted 4 or 5 times for homogenization. The alloys were annealed at 600
under vacuum for 24 hrs and then subjected to pressure-composition isotherm measurements at 100
. The hydrogen heat treatment(HHT) of samples was carried out at 600
under hydrogen pressure of 70 bar for 6 days and PC isotherms at 100
were measured. By comparing the PC isotherms measured before and after HHT, occurrence of phase separation was determined. The experimental results showed that the HIPS appeared only in Pd-0.05Co alloy. For Pd-Co alloys with various composition the PC isotherms were measured. By adopting Park-Flanagan model for ternary thermodynamics the Gibbs free energy change for Pd-Co-H solid solution was calculated and subsequently with this the HIPS in Pd-Co alloy was explained fairly.
Analysis of Density Distribution for Hydrogen Flow Using Three-dimensional Digital Speckle Tomography
Ahn, S.S. ; Ko, H.S. ;
Transactions of the Korean hydrogen and new energy society, volume 16, issue 3, 2005, Pages 253~261
Synthesis and thermal decomposition of
Jeon, Eun ; Cho, Young-Whan ;
Transactions of the Korean hydrogen and new energy society, volume 16, issue 3, 2005, Pages 262~268
](8.4 wt% theoretical hydrogen storage capacity powders have been successfully synthesized by mechanochemical reaction from mixtures of
powders in a 1:2 molar ratio in different times.
powders were characterized by X-ray diffractometry(XRD), and Furier Transform Infrared spectrometry(FT-IR). The thermal stabilities of
powders were studied by Differential scanning calorimetry(DSC), Thermogravimetry analysis(TGA), and Mass spectrometry(MS).
can be tested for hydrogen evolution without further purification. The reaction to yield hydrogen is irreversible, the other products being compounds of Zn, and borane.
thermally decomposes to release borane and hydrogen gas between about 85 and 150
: A photocatalyst for photohydrogen production
Kale, B.B. ; Bae, Jin-Ook ; Moon, Sang-Jin ; Chang, Hyun-Ju ; Lee, Chul-Wee ;
Transactions of the Korean hydrogen and new energy society, volume 16, issue 3, 2005, Pages 269~276
A Study on Pretreatment of Brucite for Mineral Carbonation
Choi, Weon-Kyung ; Moon, Seung-Hvun ; Cho, Tae-Hwan ; Lee, Jae-Keun ;
Transactions of the Korean hydrogen and new energy society, volume 16, issue 3, 2005, Pages 277~283
Pretreatment procedure was investigated into brucite powders for mineral carbonation materials. Higher magnesium content was found from brucite powders and weight loss due to hydroxy group(-OH) elimination, explained by FT-IR spectra, was found after pretreatment. X-ray diffraction results showed that the crystallographic changing of brucite into magnesium oxides during pretreatment. XPS core spectra also showed chemical transformation of magnesium ingredient from hydroxides to oxide.
Thermal Analysis of a Liquid Hydrogen Vessel with Multi-Layer-Insulation and Vapor-Cooled Shield
Jung, Il-Kwon ; Kang, Byung-Ha ;
Transactions of the Korean hydrogen and new energy society, volume 16, issue 3, 2005, Pages 284~289
Thermal analysis of cryogenic-capable vessels with insulations have been carried out to store liquid hydrogen(
). The combined insulations of MLI(Multi-Layer Insulation) and VCS(Vapor-Cooled Shield) under high vacuum are considered in the analysis for various volumes of vessels. Vapor-Cooled Shields(VCS) are installed at cylinder wall as well as disc side of the
vessels. The results indicate that optimal distribution of boiloff vapor from
vessel into two sides of VCS exists based on the evaporation loss. As the volume of
vessel is increased, mass flow rate of boiloff is increased while the evaporation loss per unit volume is decreased.
An impurity analysis study in ultra high purity Hydrogen stream: The utilization of Atmosperic Pressure Ionization Mass Spectrometer
Lee, H.S. ; Lee, T.H. ;
Transactions of the Korean hydrogen and new energy society, volume 16, issue 3, 2005, Pages 290~295
For the application of fuel cell, the content and concentration of impurities in hydrogen stream must be classified. The purpose of this study is to provide analysis tool for the determination of impurities in hydrogen with ultra high purity. To produce UHT hydrogen, we purified hydrogen gas by both getter-based catridge and liquid-nitrogen soaked catridge. We compare two methods and propose new method to know about what is in hydrogen stream.
Long-term and Short-term Scenarios Analysis for Hydrogen Techno-Economic Regime
Choi, Hyun-Do ; Lee, Min-Kyu ; Park, Sang-Ook ;
Transactions of the Korean hydrogen and new energy society, volume 16, issue 3, 2005, Pages 296~305