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1 Nm3/h급 연료 변환시스템에서 메탄의 자열 개질반응
구정분 ( Jeong Boon Koo ),신장식 ( Jang Sik Sin ),양정민 ( Jeong Min Yang ),이종대 ( Jong Dae Lee ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.5
The autothermal reforming of methane to syngas has been carried out in a reactor charged with both a Ni (15 wt%)-Ru (1wt%) /Al2O3-MgO metallic monolith catalyst and an electrically-heated convertor (EHC), The standalone type reactor has a start-up time of less than 2 min with the reactant gas of 700˚C fed to the autothermal reactor. The O2/CH4 and H2O/CH4 ratio governed the methane conversion and temperature profile of reactor. The reactor temperature increased as the reaction shifted from endothermic to exothermic reaction with decreasing H2O/CH4 ratio. Also the amount of CO2 in the products increases with increasing H2O/CH4 ratio due to water gas shift reaction. The 97% of CH4 conversion was obtained and the reactor temperature was maintained 600˚C at the condition of GHSV=10,000 h-1 and feed ratio (H2O/CH4=0.6 and O2/CH4=0.5). In this condition, the maximum flow rate of the syngas generated from the reactor charged with 170 cc of the metallic monolith catalyst is 0.94 Nm3/h.
Si 나노입자에서 shell이 전기화학적 특성에 미치는 영향
이정은,구정분,장보윤,김성수,Lee, Jeong-eun,Koo, Jeong-boon,Jang, Bo-yun,Kim, Sung-Soo 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.4
Effects of $SiO_x$ or C shells on electrochemical properties of Si nanoparticles were investigated. $SiO_x$ shells with thickness of 10~15 nm were formed on homogeneously crystalline Si nanoparticles. Incase of Si-C nanoparticles, there were 30~40 layers of C with a number of defects. Li-ion batteries were fabricated with the above-mentioned nanoparticles, and their electrochemical properties were measured. Pristine Si shows a high IRC (initial reversible capacity) of 2,517 mAh/g and ICE (initial columbic efficiency) of 87%, but low capacity retention of 22%, respectively. $SiO_x$ shells decreased IRC (1,534 mAh/g) and ICE (54%), while the retention increased up to 65%, which can be explained by irreversible phases such as $LiO_2$ and $Li_2SiO_3$. C shells exhibited no differences in IRC and ICE compared to the pristine Si but an enhanced retention of 54%, which might be from proper defect structures.
유도결합 플라즈마와 이중관 반응기를 이용하여 제조한 보론-도핑된 결정질 실리콘 나노입자의 합성
정천영,구정분,장보윤,이진석,김준수,한문희,Jung, Chun-Young,Koo, Jeong-Boon,Jang, Bo-Yun,Lee, Jin-Seok,Kim, Joon-Soo,Han, Moon-Hee 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.10
B-doped Si nanoparticles were synthesized by using inductive coupled plasma and specially designed double tube reactor, and their microstructures were investigated. 0~10 sccm of $B_2H_6$ gas was injected during the synthesis of Si nanoparticles from $SiH_4$ gas. Highly crystalline Si nanoparticles were synthesized, and their crystallinity did not change with increase of $B_2H_6$ flow rates. From SEM measurement, their particle sizes were approximately 30 nm regardless of $B_2H_6$ flow rates. From SIMS analysis, almost saturation of B in Si nanoparticles was detected only when 1 sccm of $B_2H_6$ was injected. When $B_2H_6$ flow rate exceeded 5 sccm, higher concentration of B than solubility limit was detected even if any secondary phase was not detected in XRD or HR-TEM results. Due to their high electronic conductivity, those heavily B-doped Si nanoparticles can be a potential candidate for an active material in Li-ion battery anode.
폐연료전지(廢燃料電池)스택으로부터 회수(回收)된 백금(白金)의 나노 입자(粒子) 제조(製造)
김영애,권현지,구정분,곽인섭,신장식,Kim, Young-Ae,Kwon, Hyun-Ji,Koo, Jeong-Boon,Kwak, In-Seob,Sin, Jang-Sik 한국자원리싸이클링학회 2011 資源 리싸이클링 Vol.20 No.2
연료전지 폐스택으로부터 백금을 회수하여 재사용하기 위하여 백금의 농도, pH, 환원제, 분산제의 영향을 살펴본 결과 1 mM $H_2PtCl_6$:10 mM $NaBH_4$:8 mM Cl4TABr = 1:0.4:0.4(vol.%), pH4, $50^{\circ}C$, 160 rpm, 10분 조건에서 최적 백금 나노 입자 제조 조건을 확립하였다. 시용 후 폐기된 MEA로부터 산침출을 통해 회수되어진 백금 침출 용액으로부터 백금 모사 용액과 동일한 조건에서 5 nm 이하의 백금 나노 입자를 합성하였다. 백금 모사 용액과 백금 침출 용액으로부터 합성된 백금 나노 입자를 XPS 분석을 통해 백금 이온에서 zero-valent의 백금 나노 입자로 환원되었음을 확인하였다. In this study, for recovery of renewable noble metal from used stack of fuel cell, synthesis of platinum nano particle is established through effect of platinum solution concentration, pH value, reducing agent and dispersing agent at a volume ratio of 1 mM $H_2PtCl_6$:10 mM $NaBH_4$:8 mM Cl4TABr = 1:0.4:0.4(vol.%), pH4, $50^{\circ}C$, 160 rpm and 10min. Less than 5 nm platinum particles were synthesized using Pt leaching solution from used MEA of stack under same condition of method using simulated Pt solution. The characteristics of synthesized nano particles was illustrated by XPS analysis as the reduction of platinum ions into platinum metals(zero-valent).