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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 17, Issue 4 - Dec 2006
Volume 17, Issue 3 - Sep 2006
Volume 17, Issue 2 - Jun 2006
Volume 17, Issue 1 - Mar 2006
Selecting the target year
Preferential Oxidation of CO over Alumina Supported Pt Catalysts in Hydrogen-rich Fuels
Choi, Jin-Soon ; Suh, Dong-Jin ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 241~247
The catalytic performances for CO preferential oxidation in hydrogen-rich fuels were investigated by varying the types of alumina supports, additives excluding platinum, and synthetic methods of impregnation and sol-gel synthesis. The reactions were conducted in the range of
over Pt, Co, and/or Na impregnated catalysts supported on commercial gamma-alumina, pseudoboehmite, or sol-gel derived xerogels. Catalytic activities were enhanced by cobalt addition due to strong Pt-Co interactions in the bimetallic phase. Additional sodium promoted not only the formation of the Pt-Co bimetallic interphase but also oxygen adsorption capability, giving rise to increase in the CO oxidation rate at lower temperatures. Moreover, chemical interaction between Pt and Co was considerably enhanced by sol-gel synthesis.
A Study of Reactivity Improvement of Ni-based Methane Steam Reforming Catalysts by Small Addition of Noble Metals
Jeong, Jin-Hyeok ; Koo, Kee-Young ; Seo, Yu-Teak ; Seo, Dong-Joo ; Roh, Hyun-Seog ; Seo, Yong-Seog ; Lee, Deuk-Ki ; Kim, Dong-Hyun ; Yoon, Wang-Lai ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 248~254
The promotion effects of noble metals upon the activity and reducibility in steam methane reforming over
catalysts were investigated. While
catalysts require the pre-reduction by
, the noble metal-added catalysts show high catalytic activities without pre-treatment. According to
-TPR, the addition of noble metal makes the
catalyst easily reducible. The reduction degree of NiO in the noble metal-added catalysts after using at
without pre-reduction was
, and was lower than that in the
catalyst(reduction degree=27%). The enhancement of the catalytic activity over noble metal-added catalysts results from easier reducibility by addition of noble metal and the synergy effect between noble metal and Ni.
A Development and Basic Characteristics of MCVVT Research Hydrogen Engine for Practical Use of External Mixture Hydrogen-Fueled Engine
Kang, J.K. ; Cong, Huynh Thanh ; Noh, K.C. ; Lee, J.T. ; Lee, J.H. ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 255~262
To develop a hydrogen fueled engine with external mixture which uses in high reliability, low cost and low pressure, the single cylinder research engine with MCVVT(Mechanical Continuous Variable Valve Timing) system is developed and its basic characteristics analyzed. The MCVVT developed has high reliability and the valve timing change is possible in wide range continuously. Though the mechanical loss due to MCVVT system is increased a little, back-fire suppression research for valve overlap period is no difficulty. It's also confirmed that the hydrogen-fueled engine has lower torque and is possible high lean burn. As fuel-air equivalence ratio is high, as thermal efficiency is remarkable increasing.
/hr Hydrogen Generator for Hydrogen Fueling Station
Oh, Young-Sam ; Baek, Young-Soon ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 263~271
In this study,
scale compact hydrogen generator which can be apply to the hydrogen station was manufactured and tested. The design of
scale compact hydrogen generator was upgraded on the base of
scale plate hydrogen generator concept stacking the plate reactors. Ideas for improving system efficiency such as heat recovery from the exhaust, exhaust duct which is especially design for plate type reactor, reinforcement of insulation, enlargement of heat exchange area of reactor, introduction of desulphurizer reactor and PROX rector in a compact design etc. were applied. From the performance test, we can learn that the
scale compact hydrogen generator can be operated steadily at 100% road condition and the methane conversion of over 94%(at S/C=3.75) was obtained. This result shows that the concept of plate type hydrogen generator can be scale-up to the
scale and fit for hydrogen generator for on site hydrogen station application.
Quantitative Safety Assessment for Hydrogen Station Dispenser
Rhie, Kwang-Won ; Kim, Tae-Hun ; Lee, Taeck-Hong ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 272~278
This study is quantitatively assessing of safety about dispenser of hydrogen station because it is hydrogen energy to efficient safety use. The large leakage of hydrogen gas is the most important accident among others occurrence possibility in hydrogen station. It had written FT by top event and calculated unavailability, m-cutsets, leakage frequency, etc with FTA after each base event collect reliability data by reliability data handbook, THERP-HRA and estimation of the engineering.
Design and Performance Test for a Fuel Cell Ejector to Reduce its Development Cost
Kim, Min-Jin ; Kim, Dong-Ha ; Yu, Sang-Phil ; Lee, Won-Yong ; Kim, Chang-Soo ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 279~285
Recirculation for the unreacted fuel is necessary to improve the overall efficiency of the fuel cell system and to prevent fuel starvation since the fuel cell for a vehicle application is a closed system. In case of the automotive fuel cell, the ejector which does not require any parasitic power is good for the performance improvement and easy operation. It is essential to design the customized ejector due to the lack of the commercial ejector corresponding to the operating conditions of the fuel cell systems. In this study, the design methodology for the ejector customized to an automotive fuel cell is proposed. The model based sensitivity analysis prevents the time-consuming redesign and reduces the cost of developing ejector. As a result, the customized ejector to meet the desired performance within overall operating range has developed for the PEMFC automotive system.
Effect of Limiting Factors for Hydrogen Production in Sulfur Deprived Chlamydomonas Reinhardtii
Kim, Jun-Pyo ; Sim, Sang-Jun ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 286~292
Chlamydomonas reinhardtii is a green algae that can use light energy and water to produce hydrogen under anaerobic condition. This work reports the effect of limiting factors on hydrogen production in sulfur deprived anaerobic C. reinhardtii culture. In order to confirm the relationship between hydrogen production and limiting factors such as residual PSII activity and endogenic substrate degradation, the increase in chlorophyll concentration and the decrease in starch concentration was investigated during sulfur deprivation. The overall hydrogen production increased depending on cell density in range of
DCW/l. At this time, the increase in chlorophyll concentration during 24 h after sulfur deprivation increased in proportion to hydrogen production, however, the decrease in starch concentration was not proportional to that. Therefore, hydrogen production under sulfur deprivation using green alga was closely associated with the residual PSII activity than the endogenic substrate degradation.
Performance of Ru-based Preferential Oxidation Catalyst and Natural Gas Fuel Processing System for 1 kW Class PEMFCs System
Seo, Yu-Taek ; Seo, Dong-Joo ; Seo, Young-Seog ; Roh, Hyun-Seog ; Jeong, Jin-Hyeok ; Yoon, Wang-Lai ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 293~300
KIER has been developing a Ru-based preferential oxidation catalysts and a novel fuel processing system to provide hydrogen rich gas to residential PEMFCs system. The catalytic activity of Ru-based catalysts was investigated at different Ru loading amount and different support structure. The obtained result indicated that 2 wt% loaded Ru-based catalyst supported on
showed high activity in low temperature range and suppressed the methanation reaction. The developed prototype fuel processor showed thermal efficiency of 78% as a HHV basis with methane conversion of 92%. CO concentration below 10 ppm in the produced gas is achieved with separate preferential oxidation unit under the condition of
. The partial load operation have been carried out to test the performance of fuel processor from 40% to 80% load, showing stable methane conversion and CO concentration below 10 ppm. The durability test for the daily start-stop and 8 h operation procedure is under investigation and shows no deterioration of its performance after 50 start-stop cycles. In addition to the system design and development.
A Study on the HI Decomposition by Carbon-Supported Platinum Catalyst
Park, J.E. ; Kim, J.M. ; Kang, K.S. ; Kim, C.H. ; Kim, Y.H. ; Park, C.S. ; Bae, K.K. ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 301~308
The present work explores the effect of carbon-supported platinum catalyst on the HI decomposition using gas adsorption analyzer, thermogravimetry, X-ray diffractometry, scanning electron microscopy, and gas chromatography. For this purpose, three types of activated carbon (C), Pt/C-1 wt.%, and Pt/C-5 wt.% were prepared. The HI gas conversion is crucially influenced by the amount of Pt on the carbon support. The more the amount of Pt was, the higher results in the HI gas conversion. For three types of catalysts, HI conversion increased with increasing the decomposition temperature but with decreasing the space velocity. The increase of HI conversion with temperature was more pronounced in activated carbon than that in Pt/C. From EDX result, it was found that the activated carbon comprised higher amount of iodine than the Pt/C after the decomposition reaction. This implies that the HI conversion is closely related to the amount of Iodine.
A Study on the Synthesis of Co-ferrite by High-energy Ball Milling and Thermal Reduction Characteristics
Cho, M.S. ; Kim, W.J. ; Kim, C.H. ; Kang, K.S. ; Kim, Y.H. ; Park, C.S. ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 309~316
Co-ferrite was synthesized by HEBM (High Energy Ball Milling) with a stoichiometric (Co/Fe=0.5/2.5) mixture of CoO and
powders. The effect of milling time on the phase transformation of the mixture was investigated by XRD. Mono-phase solid solution of Co-ferrite, which was milled for 4 h and then calcined at
in the Ar atmosphere, was confirmed by XRD analysis. The composition and thermal reduction behavior of Co-ferrite were analyzed by TGA and XRF. As a result, oxygen deficient Co-ferrite was synthesized by HEBM and the weight decrease of the Co-ferrite, which was oxidized at
for 10h by
vapor, was 2.41 wt% during thermal reduction at
Effect of Carbon Content of Sulfur Electrode on the Electrochemical Properties of Lithium/Sulfur Battery Using PEO Electrolyte
Kang, K.Y. ; Ryu, H.S. ; Kim, J.S. ; Kim, K.W. ; Ahn, J.H. ; Lee, G.H. ; Ahn, H.J. ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 317~323
Electric conductive material should be homogeneously mixed with sulfur in sulfur electrode fabrication of lithium/sulfur battery, because sulfur is electric insulator. In this paper electrochemical properties of Li/S battery was studied with various compositions of sulfur electrodes. When content of sulfur changed from 40 wt.% to 80 wt.%, the 60 wt.% sulfur electrode showed the maximum capacity of 1489 mAh/g-sulfur. Electrochemical properties of Li/S battery using 60 wt.% sulfur was also investigated with various carbon contents. The discharge capacity changed as a function of carbon contents. The optimum composition was 25 wt.% carbon for 60 wt.% sulfur electrode.
Fabrication of Sn-Sb Based Powder by Carbothermal Reduction of Spherical Ultrafine Metal Oxides
Hong, Seong-Hyeon ; Bae, Jong-Soo ; Chin, Young-Mi ; Kwon, Hae-Woong ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 324~330
In this study, carbothermal reduction method was employed to synthesis Sn-Sb alloy powders from chief metal oxides with ultrafine sizes. The Sn-Sb powders consisting of ultrafine particles were formed at
by reduction of oxides. Those powders have high initial discharge capacities (
) and discharge capacities of those powders maintain initial capacity after 20 cycle due to existence of ultrafine particles in powders and alloying effect of Sn-Sb.
Improvement of Properties in Solid Polymer Electrolyte Using New Preparation Method
Kim, Tae-Hee ; Lee, Jung-Hun ; Park, Kwon-Pil ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 331~337
Test Results Grid Connection of 120 kW Power Generation System
Hwang, Jung-Hee ; Ahn, Kyo-Sang ; Lim, Hee-Cheon ; Kim, Su-Chang ; Kim, Sin-Sub ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 338~346
In this paper, the test results of medium-size(120 kW class) PV system which was installed in the Taeahn thermal power station of Korea Western Power Co., Ltd., were summarized for developing the practical technology to applicate high voltage grid connection PV system. The 120 kW photovoltaic system which was consisted of 1,300 modules, PCS, and 150 kVA transformer station has been operated since Aug. 05, 2005. For verifying the modeling results of PV system, the operation data was compared with modeling results which was executed commercial PSCAD/EMTD and Psim tools. An equivalent circuit model of a solar cell has been also used for solar array modeling. A series of parameters required for array modeling have been estimated from general specification data of a solar module. A PWM voltage source inverter(VIS) and its current control scheme have been analyzed by using P&O (perturbation and Observation) MPPT algorithms technique.
Property Changes of Gas Diffusion Layer in a PEFC by Compression
Ahn, Eun-Jin ; Yoon, Young-Gi ; Park, Gu-Gon ; Park, Jin-Soo ; Lee, Won-Yong ; Han, Hak-Soo ; Kim, Chang-Soo ;
Transactions of the Korean hydrogen and new energy society, volume 17, issue 3, 2006, Pages 347~352