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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 18, Issue 4 - Dec 2007
Volume 18, Issue 3 - Sep 2007
Volume 18, Issue 2 - Jun 2007
Volume 18, Issue 1 - Mar 2007
Selecting the target year
2-Step Thermochemical Water Splitting on a Active Material Washcoated Monolith Using a Solar Simulator as Heat Source
Kang, Kyoung-Soo ; Kim, Chang-Hee ; Park, Chu-Sik ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 109~115
Solar energy conversion to hydrogen was carried out via a two-step thermochemical water splitting using metal oxide redox pair. To simulate the solar radiation, a 7 kW short arc Xe-lamp was used. Partially reduced iron oxide and cerium oxide have the water splitting ability, respectively. So,
was selected as the active material.
(20 wt/80 wt%) was prepared by impregnation method, then the active material was washcoated on the ceramic honeycomb monolith made of mullite and cordierite. Oxygen was released at the reduction step(
) and hydrogen was produced from water at lower temperature(
). The result demonstrate the possibility of the 2-step thermochemical water splitting hydrogen production by the active material washcoated monolith. And hydrogen and oxygen was produced separately without any separation process in a monolith installed reactor. But the SEM and EDX analysis results revealed that the support used in this experiment is not suitable due to the thermal instability and coating material migration.
Study on Catalytic Activity of the Selective CO Oxidation and Characterization Using
Sohn, Jung-Min ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 116~123
](X=0, 0.1, 0.3, 0.5) perovskites were prepared by coprecipitation method at pH 7 or pH 11 and its catalytic activity of selective CO oxidation was investigated. The characteristics of these catalysts were analyzed by
adsorption, X-ray diffraction(XRD), SEM,
-temperature programmed desorption(TPD). The pH value at a preparation step made effect on particle morphology. The smaller particle was obtained with a condition of pH 7. The better catalytic activity was observed using catalysts prepared at pH 7 than pH 11. The maximum CO conversion of 98% was observed over
, the most active catalyst was
, of which conversion was 92% at
. By the substitution of Cu, the evolution of
-oxygen was remarkably enhanced regardless of pH value at preparation step according to
-TPD. Among the different
-oxygen species, the oxygen species evolved between
, gave the better catalytic performance for selective CO oxidation including
in which Cu was absent.
Methane Partial Oxidation Using Cu-ferrite
Woo, Sung-Woung ; Kang, Kyoung-Soo ; Kim, Chang-Hee ; Park, Chu-Sik ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 124~131
Methane is partially oxidized to produce the syngas by the lattice oxygen of metal oxides in the absence of gaseous oxygen. The present work deals with ferrite including copper component, which does not chemisorb methane, to investigate the suppression of the carbon deposition during the reduction of metal oxides by methane. Iron-based oxides of
(X=0.25, 0.5, 1.0) was synthesized by the co-precipitation method. Thermogravimetric Analysis(TGA) was used to observe the isothermal reduction behavior of
under methane atmosphere. The crystal structures of reduced specimens were characterized by X-rays powder diffraction(XRD) technique. From the analyses of TGA, it is concluded that the reduction kinetics of
was the fastest among
(X=0.25, 0.5, 1.0). The X-ray diffraction analyses indicated that
was decomposed to Cu and
and was reduced to Cu and Fe phase at
, which was reduced at
, showed Fe, graphite and
phases. On the contrary,
does not show the graphite or
phases. This results infer that Cu component suppress the carbon deposition on Cu-ferrite.
Production of Hydrogen from Methane Using a 3 Phase AC Glidarc Discharge
Kim, Seong-Cheon ; Chun, Young-Nam ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 132~139
Popular techniques for producing synthesis gas by converting methane include steam reforming and catalyst reforming. However, these are high temperature and high pressure processes limited by equipment, cost and difficulty of operation. Low temperature plasma is projected to be a technique that can be used to produce high concentration hydrogen from methane. It is suitable for miniaturization and for application in other technologies. In this research, the effect of changing each of the following variables was studied using an AC Glidarc system that was conceived by the research team: the gas components ratio, the gas flow rate, the catalyst reactor temperature and voltage. Glidarc plasma reformer was consisted of 3 electrodes and an AC power source. And air was added for the partial oxidation reaction of methane. The result showed that as the gas flow rate, the catalyst reactor temperature and the electric power increased, the methane conversion rate and the hydrogen concentration also increased. With
ratio of 0.45, input flow rate of 4.9 l/min and power supply of 1 kW as the reference condition, the methane conversion rate, the high hydrogen selectivity and the reformer energy density were 69.2%, 36.2% and 35.2% respectively.
Reaction Characteristics of Thermochemical Methane Reforming on Ferrite-Based Metal Oxide Mediums
Cha, Kwang-Seo ; Lee, Dong-Hee ; Jo, Won-Jun ; Lee, Young-Seak ; Kim, Young-Ho ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 140~150
Thermochemical 2-step methane reforming, involving the reduction of metal oxide with methane to produce syngas and the oxidation of the reduced metal oxide with water to produce pure hydrogen, was investigated on ferrite-based metal oxide mediums. The mediums, CoFZ, CuFZ, or MnFZ, were composed of the mixture of M(M=Co, Cu or Mn)-substituted ferrite as an active component and
as a binder, respectively. The WZ medium, composed of the mixture of
, was also prepared to compare. With an addition of
, the surface area of the mediums was slightly increased and the sintering of active components was greatly suppressed during the reduction. The higher reactivity of the reduced mediums for water splitting was confirmed by the temperature programmed reaction. From the results of the thermochemical 2-step methane reforming, the reactivity of
reduction and water splitting with ferrite-based metal oxide mediums was relatively higher than that with WZ, and the order of reactivity of the mediums was MnFZ>CoFZ>CuFZ>WZ.
Use of Solar Cell and Nanofiltration Membrane for System of Enzymatic
Production Through Light-Sensitized Photoanode
Shim, Eun-Jung ; Bae, Sang-Hyun ; Yoon, Jae-Kyung ; Joo, Hyun-Ku ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 151~156
Solar cell and nanofiltration membrane were utilized in a system of enzymatic hydrogen production through light-sensitized photoanode, which resembles photoelectrochemical(PEC) configuration. Solar cell uses no additional light energy to increase energy for electrons to reduce protons and for holes to oxidize water to oxygen, and nanofiltration membrane replaces a salt bridge successfully with increased ion transport capability. With this system configuration, optimized amount of enzyme(10.98 unit), and an anodized tubular
/1 hr in 0.5 wt% HF-
/5 hr) hydrogen evolved at a rate of ca.
in a cathodic compartment and oxygen generated at a rate of ca.
in an anodic compartment. The stoichiometric evolution of gases indicated that water was splitted in the system.
Degradation of Polymer Electrolyte Membrane under Low Current/Low Humidity Conditions
Kim, Tae-Hee ; Lee, Jung-Hun ; Lee, Ho ; Lim, Tae-Won ; Park, Kwon-Pil ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 157~163
During PEMFC operation, low current and low humidity conditions accelerate the degradation of perfluorosulfonic acid membrane. But, there have been no studies that clearly explain why these conditions accelerate the membrane degradation. In this study, the hydrogen permeability through the membrane, I-V polarization of MEA, fluoride emission rate(FER) in effluent water were measured during cell operation under low current densities and low relative humidity(RH). The experimental results were evaluated with oxygen radical mechanism the most commonly known for membrane degradation. It seems that low RH of anode is a good condition for
radical formation on the Pt catalyst and the low current condition accelerates the
radical attacking the polymer membrane.
Anaerobic Digester Gas Purification for the Fuel Gas of the Fuel Cell
Lee, Jong-Gyu ; Jun, Jae-Ho ; Park, Kyu-Ho ; Choi, Doo-Sung ; Park, Jae-Young ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 164~170
The Tancheon wastewater treatment plant(WWTP) in Seoul using anaerobic digestion to reduce the outlet sludge produces anaerobic digester gas which contains 65%
. The gas purification equipment was installed and operated to use Anaerobic Digester Gas(ADG) as a fuel for molten carbonate fuel cell(MCFC). The processes consist of the desulfurizer and the adsorption tower to remove
and siloxane in the gas. The gas purification equipment removed virtually over 95% of
and over 99% of siloxane. Results has demonstrated that the fuel cell can produce electrical output and hot water with negligible air emissions of CO, NOx and
. The site provides the first opportunity in Korea for demonstrating Molten carbonate fuel cell(MCFC) which the digester gas was applied to the fuel gas.
Effects of Addition of Hydrogen and Water Vapor on Flame Structure and NOx Emission In
-Air Diffusion Flame
Park, Jeong ; Keel, Sang-In ; Yun, Jin-Han ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 171~181
Blending effects of hydrogen and water vapor on flame structure and NOx emission behavior are numerically studied with detailed chemistry in methane-air counterflow diffusion flames. The composition of fuel is systematically changed from pure methane and pure hydrogen to the blending fuels of methane-hydrogen-water vapor through the molar addition of
. Flame structure is changed considerably for hydrogen-blending methane flames and hydrogen-blending methane flames diluted with water vapor in comparison to pure methane flame. These complicated changes of flame structures also affect NOx emission behavior considerably. The changes of thermal NO and Fenimore NO are analyzed for various combinations of the fuel composition. Importantly contributing reaction steps to thermal NO and Fenimore NO are addressed in pure methane, hydrogen-blending methane flames, and hydrogen-blending methane flames diluted with water vapor.
Hydrogen Embrittlement and Surface Properties of Pd-coated Zr-based Amorphous Alloys
Seok, Song ; Lee, Dock-Young ; Kim, Ki-Bae ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 182~188
] amorphous alloys ribbon was prepared by a single-roller melt-spinning technique. In order to improve the hydrogen kinetics Pd-coating were carried out on each side of the amorphous ribbon. Pd prevents oxidation of Zr and catalyses the dissociation of molecular hydrogen to atomic hydrogen. In this work, the hydrogen embrittlement and surface properties on Zr-based amorphous alloys were investigated. The Zr-based amorphous alloys were characterized by X-ray diffractometry(XRD) and differential scanning calorimetry(DSC). The morphology of surface and roughness was observed by using scanning electron microscopy(SEM) and atomic force microscopy (AFM). A lattice parameter of both Pd and Zr-based amorphous alloy was increased after hydrogen permeation at 473 K. After hydrogen permeation at 473 K, some cracks were observed on the surface of Pd, which was the cause for the hydrogen embrittlement. The crystallization temperature of Zr-based amorphous alloy was decreased due to the permeated hydrogen.
Evaporation Heat Transfer and Pressure Drop of Carbon Dioxide In a Horizontal Tube
Son, Chang-Hyo ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 189~196
The evaporation heat transfer coefficient and pressure drop of
(R-744) in a horizontal tube was investigated experimentally. The main components of the experimental apparatus are a receiver, a variable-speed pump, a mass flow meter, a pre-heater and an evaporator(test section). The test section consists of a horizontal stainless steel tube of 4.57 mm inner diameter. The experiments were conducted at mass flux of
saturation temperature of
, and heat flux of
. The test results showed that the heat transfer coefficient of
has a greater effect on nucleate boiling more than convective boiling. Mass flux of
does not affect nucleate boiling too much. In comparison with test data and existing correlations, All of the existing correlations for the heat transfer coefficient underestimated the experimental data. However lung et al.'s correlation showed a good agreement with the experimental data. The evaporation pressure drop of
increases with increasing mass flux and decreasing saturation temperature. When comparison between the experimental pressure drop and existing correlations. Existing correlations failed to predict the evaporation pressure drop of
Technology Trend for Photochemical Hydrogen Production by the Patent Analysis
Moon, Sang-Jin ; Kang, Kyung-Seok ; Han, Hye-Jeong ; Baeg, Jin-Ook ; Kim, Jong-Wook ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 197~206
There are several methods for the hydrogen production such as steam reforming of natural gas, photochemical method, biological method, electrolysis and thermochemical method, etc. Many researches have been widely performed for the hydrogen production method having low production cost and high efficiency. In this paper, the patents concerning the photochemical hydrogen production method were gathered and analyzed. The search range was limited in the open patents of USA(US), European Union(EP), Japan(JP), and Korea(KR) from 1996 to 2005. Patents were gathered by using key-words searching and filtered by filtering criteria. The patent application trend was analyzed by the years, countries, companies, and technologies.
Strategy of Energy Technology Development for Establishing the Hydrogen Economy
Lee, Seong-Kon ; Mogi, Gento ; Kim, Jong-Wook ; Shin, Sung-Chul ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 207~215
The rapid changes of energy environment such as high oil price, united nations framework convention on climate change, and the hydrogen economy have been happening to provide national energy security in the 21st century, we need to build strategic approach for coping with energy environment. From a long-term viewpoint of energy technology development, it's time to develop energy technology with selection and specification. In this study, we build energy technology roadmap for establishing the hydrogen economy with a long-term strategy. We analyze economic spin-offs and commercial potential for establishing energy technology roadmap of energy technology development for establishing the hydrogen economy.
Analysis of the World Energy Status and Hydrogen Energy Technology R&D of Foreign Countries
Kang, Seok-Hun ; Choi, Sang-Jin ; Kim, Jong-Wook ;
Transactions of the Korean hydrogen and new energy society, volume 18, issue 2, 2007, Pages 216~223
The present carbon-based energy system will not last long due to its environmental and economical drawbacks. Hydrogen energy attracts more attention recently and seems to have large ripple effect on economy providing its technical, environmental and economical problems are solved. This paper analyses the situation changed from fossil to non-fossil energy system and the R&D policies of advanced countries by reviewing the world energy status and the energy policy of foreign countries. Finally, the R&D strategy of hydrogen energy technology was developed through analyzing the present states of energy research policy and programs of major countries.