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Cho, H.S.,Gokon, N.,Kodama, T.,Kang, Y.H.,Lee, H.J. Elsevier 2015 International journal of hydrogen energy Vol.40 No.1
<P><B>Abstract</B></P> <P>The joint international project between Niigata University (Japan) and the Korea Institute of Energy Research, KIER (Korea) on “Solar Demonstration of Water-Splitting Reactor using Ceramic Foam Device” has two goals. (1) Develop a solar reactor using reactive cerium oxide foam devices for high-temperature two-step thermochemical water-splitting cycle. (2) Test its performance under various operational methods using a 40 kW<SUB>th</SUB> solar furnace driven by natural solar energy. The reactive CeO<SUB>2</SUB>/MPSZ (MgO – partially stabilized zirconia) foam device for two-step water-splitting was developed and prepared by Niigata University/Japan; it involves coating an inert zirconia foam matrix with reactive CeO<SUB>2</SUB>. In this paper, highly reactive CeO<SUB>2</SUB> particles were used the redox material in CeO<SUB>2</SUB>/MPSZ foam devices to investigate the use of solar energy for hydrogen production. The solar-driven thermochemical two-step water-splitting cycle was demonstrated using the 40 kW<SUB>th</SUB> KIER solar furnace in Korea combined with the CeO<SUB>2</SUB>/MPSZ foam device. At the center of the foam device, temperatures were 1500 °C–1600 °C during the thermal reduction step and 600 °C-1100 °C during the subsequent water decomposition step. Hydrogen was successfully produced from the CeO<SUB>2</SUB>/MPSZ foam device, and profiles for hydrogen production and CeO<SUB>2</SUB> conversion indicated definitely improved operations compared to earlier studies.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Three different operational methods were tested using a ceria-coated foam device. </LI> <LI> A ceria-coated foam device was fabricated by spin coating method. </LI> <LI> A H<SUB>2</SUB> production process under real solar condition tested using a KIER solar furnace. </LI> <LI> In the cycles, a CCD-camera was used to monitor the discoloration of the foam device. </LI> <LI> Each of the three operational methods tested showed significant differences. </LI> </UL> </P>
고온 태양열 2단계 열화학 반응기 형상에 따른 수소 생산량의 변화 연구(Ⅰ)
신예원(Shin Ye-won),오상준(Oh Sang-June),N. Gokon,T. Kodama,서태범(Seo Tae-beom) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
A two step thermochemical cycle includes a T-R(Thermal Reduction)step and W-D(Water Decomposition)step and the mechanism is oxidation/reduction reaction. The react temperature for T-R step is about 2200℃ and for W-D step is about 1000℃. In this study, NiFe₂O₄ and Fe₃O₄ supported on monoclinic ZrO₂ is used to device and Ni powder is help to reduce the T-R step reaction temperature. The experiment performed a field scale with dish type solar heat concentrated system(Inha dish-1, Songdo, Incheon). In this study, hydrogen production is analyzed varying the number of cycles and a sharply fluctuated environment with 2nd reactor. The cycle repeated 5 times, ferrite conversion rate are 4.49~29.97% and hydrogen production rate is 0.19~1.54mmol/g-ferrite. And it perform a basic research for improving a reactor design to increase a hydrogen production and stabilize. For this subject, results of 2nd and 3rd reactor is compared when the cycle is finished.
Solar CO₂-Reforming of Methane Using a Catalytically-Activated Metallic Foam Absorber
신일융(Shin Il-yoong),이진규(Lee Jin-Gyu),Nobuyuki Gokon,Tatsuya Kodama,서태범(Seo Tae-Beom) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
Solar reforming of methane with CO₂ was successfully tested with a direct irradiated absorber on a parabolic dish capable of 5㎾<SUB>th</SUB> solar power. The new type of catalytically activated metallic foam absorber was prepared, and its activity was tested. Ni was applied as the active metal on the gamma-alumina coated Ni metal foam for the preparation of the catalytically-activated metal foam layer. Compared to conventional direct irradiation of the catalytically-activated ceramic foam absorber, this new metallic foam absorber is found to exhibit a superior reaction performance at the relatively low insolation or at low temperatures. In addition, unlike direct irradiation of the catalytically-activated ceramic foam absorber, metallic foam absorber has better thermal resistance, which prevents the emergence of cracks caused by mechanical or thermal shock. The total solar power absorbed reached up to 2.1㎾ and the maximum CH₄ conversion was almost 40%.