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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 15, Issue 4 - Dec 2004
Volume 15, Issue 3 - Sep 2004
Volume 15, Issue 2 - Jun 2004
Volume 15, Issue 1 - Mar 2004
Selecting the target year
Numerical Study on Properties of Metals and Expansion of Metal Hydrides
Jung, Y.G. ; Park, K.S. ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 4, 2004, Pages 257~265
Numerical analysis, as EAM(Embedded Atom Method), in the atomic level is necessary to analyze the relation between the hydrogen and hydrogen absorption metals. EAM established on density functional theory was developed as a new means for calculating various properties and phenomena of realistic metal systems. In this study, we had constructed the EAM program from constitutive formulae and parameters of the hydrogen, nickel and palladium for the purpose of predicting the expansion behavior on hydrogen absorbing. In result, not only the ground state properties of metals but also lattice constants and the volume expansion ratio of metal hydrides show good agreement with Daw's data and experiment data.
Review on Delayed Hydride Cracking and Stress Corrosion Cracking of Metals
Kim, Young Suk ; Cheong, Yong Moo ; Im, Kyung Soo ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 4, 2004, Pages 266~273
The objective of this study is an understanding of stress corrosion cracking of metals that is recognized to mostly limit the lifetime of the structural materials by comparing the features of delayed hydride cracking of zirconium alloys with those of stress corrosion cracking (SCC) of Ni-based alloys and hydrogen cracking of stainless steels. To this end, we investigated a dependence of delayed hydride cracking (DHC) velocity on the applied stress intensity factor and yield strength, and correlated a temperature dependence of the striation spacing and the DHC velocity. We reviewed a similarity of the features between the DHC of zirconium alloys, the SCC of Ni-based alloys and turbine rotor steels, and the hydrogen cracking of stainless steels and discussed the SCC phenomenon in metals with our DHC mode.
Hydrogen Production by Autothermal Reforming Reaction of Gasoline over Ni-based Catalysts and it Applications
Moon, Dong Ju ; Ryu, Jong-Woo ; Yoo, Kye Sang ; Lee, Byung Gwon ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 4, 2004, Pages 274~282
This study focused on the development of high performance catalyst for autothermal reforming (ATR) of gasoline to produce hydrogen. The ATR was carried out over MgO/Al2O3 supported metal catalysts prepared under various experimental conditions. The catalysts before and after reaction were characterized by N2-physisorption, CO-chemisorption, SEM and XRD. The performance of supported multi-metal catalysts were better than that of supported mono-metal catalysts. Especially, it was observed that the conversion of iso-octane over prepared Ni/Fe/MgO/Al2O3 catalyst was 99.9 % comparable with commercial catalyst (ICI) and the selectivity of hydrogen over the prepared catalyst was 65% higher than ICI catalyst. Furthermore, it was identified that the sulfur tolerance of prepared catalyst was much better than ICI catalyst based on the ATR reaction of iso-octane containing sulfur of 100 ppm. Therefore, Ni/Fe/MgO/Al2O3 catalyst can be applied for a fuel reformer, hydrogen station and on-board reformer in furl cell powered vehicles.
The Experimental Study on the Direct Synthesis of DME (Dimethyl Ether) in the Fixed Bed Reactor.
Choi, Chang Woo ; Cho, Wonihl ; Ju, Woo-Sung ; Lee, Seung-Ho ; Baek, YoungSoon ; Row, Kyung Ho ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 4, 2004, Pages 283~290
The single-step process for conversion of syngas to DME give higher conversion than the syngas-to-methanol process. This arises because of a synergy among the three simultaneous reaction, methanol synthesis, methanol dehydration and water gas shift reaction, in the process. we would find the optimal condition of the process which these advantages. The optimal condition of DME synthesis reaction over a commercial
catalyst and Hybrid catalyst in a fixed bed reactor. The syngas-to-dimethyl ether conversion was examined on various reaction condition (Temperature 473~553K,
ratio 1~3, Pressure 30'50atm, GHSV 1000~4000).
A Study on Performance Improvement in PEMFC
Chon, Kwang Wu ; Park, Chang Kwon ; Lee, Ho Yeol ; Oh, Byeong Soo ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 4, 2004, Pages 291~300
Performance of PEMFC is affected by many factors such as that of MEA, configuration of flow field, operating conditions, humidification, cooling and so on. In this study, in order to improve the performance of fuel cell, a small area fuel cell stack was made and its performance was tested under various operating conditions. Stack consists of 3 single PEM fuel cells. Channel is serpentine type and the active area of the electrode is
. The test results show that the peak power is 60W at
of stack temperature with humidification condition.
The Study on Methane Reforming by CO
and Steam for Manufacture of Synthesis Gas
Cho, Wonihl ; Lee, Seung-Ho ; Mo, Yong-Gi ; Sin, Donggeun ; Baek, Youngsoon ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 4, 2004, Pages 301~308
The methane reforming with
and steam for manufacture of synthesis gas over
catalyst was investigated. Mixed reforming carried out
dry reforming with
and steam for development of DME process in pilot plant. To improve a catalyst deactivation by coke formation, the mixed reforming added carbon dioxide and steam as a oxidizer of the methane reforming was suggested. The result of experiments over commercial catalyst in
dry reforming has shown that the catalyst activity decrease rapidly after 20 hours. In case of
catalyst, the deactivation of 20 percent after 30 hours was occurred. The activity of Ni/C catalyst still was not decreased dramatically after 100 hours. The effect of
reforming with steam over
catalyst obtained the optimal conversion of methane and carbon dioxide, and could be produced synthesis gas at ratio of
Biological hydrogen production using Chlamydomonas reindardtii biomass
Kim, Mi-Sun ; Baek, Jin-Sook ; Kim, Sun Chang ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 4, 2004, Pages 309~316
Chlamydomonas reinhardtii UTEX 90 was cultivated with continuous supply of 2%
using TAP media at
and produced biomass 1.18 g of dry cell weight/L for 4 days. C. reinhardtii algal biomass(CAB) was concentrated to 20 times by volume and converted into hydrogen and organic acids by anaerobic fermentation using Clostridium butyricum. Organic acids in the fermentate of CAB were consecutively used to produce hydrogen by Rhodobacter sphaeroides KD 131 under the light condition. Approximately 52% of starch in the concentrated CAB which had 4-5.8, 24-26 and 6-7 g/L of starch, protein and fat, respectively was degraded by Cl. butyricum at
. During this process, hydrogen and some organic acids, such as formate, acetate, propionate, and butyrate, respectively were produced. Further conversion of the organic acids in anaerobic fermentate of CAB by Rb. sphaeroides KD131 produced hydrogen from the anaerobic fermentate under the illumination of 8 klux using halogen lamp at
. The result showed that hydrogen was evolved by the anaerobic conversion using Cl. butyricum and then by the photosynthetic fermentation using Rb. sphaeroides KD131. It indicated that the two-step conversion process produced the maximum amount of hydrogen from algal biomass which contained carbohydrate, protein, and fat via organic acids.
Fabrication of MISFET type hydrogen sensor for high Performance
Kang, K.H. ; Park, K.Y. ; Han, S.D. ; Choi, S.Y. ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 4, 2004, Pages 317~323
We fabricated a MISFET using Pd/NiCr gate for the detecting of hydrogen gas in the air and investigated its electrical characteristics. To improve stability and high concenntration sensitivity and remove the blister generated by the penetration of hydrogen atoms Pd/NiCr catalyst gate metal are used as dual gate. To reduce the gate drift voltage caused by the inflow of hydrogen, the gate insulators of sensing and reference FFET were constructed with double insulation layers of silicon dioxide and silicon nitride. The hydrogen response of MISFET were amplified with the difference of gate voltages of both MISFET. To minimize the drift and the noise, we used a OP177 operational amplifier. The sensitivity of the Pd/NiCr gate MISFET was lower than that of Pd/Pt gate MISFET, but it showed good stability and ability to detect high concentration hydrogen up to 1000ppm.
Economic analysis of hydrogen production technology using water electrolysis
Sim, Kyu-Sung ; Kim, Chang-Hee ; Park, Kee-Bae ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 4, 2004, Pages 324~332
According to the rapid depletion of the fossil fuels, the electricity and hydrogen will gradually take charge of the future energy supply. Especially, in order to control the supply and demand of electricity, energy storage medium is necessary and this could be solved by the combination of water electrolysis and fuel cell. Although electricity can be generated from such alternative energies as hydropower, nuclear, solar, and wind-power resources, alternative energy storage medium is also required since regenerative energies, solar and wind-powers, are intermittent energy resources. In this regard, hydrogen production from water electrolysis was recognized as a superb method for electricity storage. In this work, the current development and economic status of alkaline, solid polymer, and high temperature electrolysis were reviewed, and then the practical use of water electrolysis technology were discussed.
Degradation Properties and Production of Fuels of Cellulose - Pyrolysis-Liquefaction -
Lee, Jong-Jip ; Lee, Byeong-Hak ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 4, 2004, Pages 333~340
In this study, thermochemical degradation by pyrolysis-liquefaction of cellulose, the effects of reaction time, reaction temperature, conversion yield, degradation properties and degradation products were investigated . Experiments were performed in a tube reactor by varying reaction time from 20 to 80 min at
. Combustion heating value of liquid products from thermochemical conversion processes of cellulose was in the range of 6,920~6,960cal/g. After 40min of reaction at
in pyrolysis-liquefaction of cellulose, the energy yield and mass yield was as high as 54.3% and 34.0g oil/100g raw material, respectively. The liquid products from pyrolysis-liquefaction of cellulose contained various kinds of ketones, phenols and furans. ketones and furans could be used as high-octane-value fuels and fuel additives. However, phenols are not valuable as fuels.