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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.
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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).
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음용수내 발암물질인 염소 소독부산물의 전기화학적 제거 특성
권순우 ( Sun Woo Kwon ),이종대 ( Jong Dae Lee ),신장식 ( Jang Sik Sin ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.4
N/A It has been confirmed that some Trihalomethanes (THMs) suspected as carcinogens, can be formed during chlorination for water supply through the reaction of chlorine and humic substances in water. The electrochemical characteristics on activated carbon fiber filter (ACF) electrode were investigated to remove the THMs in the chlorination process of drinking water. The electrochemical removal efficiency depended on the applied voltage and flow rate. In this study, the best result showed that the removal efficiency of THMs was higher than 99%.
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허북구(Buk Gu Heo),박용서(Yong Seo Park),허원녕(Won Noung Hou),임명희(Myung Hee Im),박윤점(Yun Jum Park),김현주(Hyun Ju Kim),신장식(Jang Sik Sin),조자용(Ja Yong Cho) 한국원예학회 2008 원예과학기술지 Vol.26 No.3
홍련 꽃과 잎의 소비확대를 위한 기초자료 확보측면에서 2007년 8월 14일에 전남 나주 동강면에서 꽃과 잎을 수확하여 열수와 에탄올 추출물의 생리활성 효과를 조사하였다. 총 페놀함량은 잎과 꽃의 에탄올 추출물에서 각각 92.2㎎ㆍℓ⁻¹ 와 62.5㎎ㆍℓ⁻¹로 높게 나타났다. 전자공여능은 추출물의 농도가 500㎎ㆍℓ⁻¹ 일 때 열수추출물은 꽃 21.6%, 잎은 6.8%로 낮았으나 에탄올 추출물은 꽃 94.1%, 잎은 83.5%로 높게 나타났다. 총 플라보노이드 함량은 잎과 꽃의 에탄올 추출물에서 각각 90.2㎎ㆍℓ⁻¹와 46.2㎎ㆍℓ⁻¹로 높게 나타났다. 아질산염 소거는 추출물의 농도가 500㎎ㆍℓ⁻¹일 때 꽃과 잎의 에탄올 추출물에서 각각 80.7%와 49.7%로 높게 나타났다. Tyrosinase활성 저해 효과는 부위와 용매에 관계없이 거의 나타나지 않았다. 추출물은 농도가 500㎎ㆍℓ⁻¹일 때 추출 부위 및 용매에 관계없이 그람양성균 6종과 그람음성균 3종에 대해 항균활성 효과를 나타내었다. This study was conducted to determine physiological activities of flower and leaf extracts of red lotus (Nelumbo nucifera). Flowers and leaves of red lotus grown at a field in Donggang-Myun, Naju-City, Jeonnam, was harvested on August 14, 2007. The flower and leaf samples were extracted with either hot water or ethanol, and were examined for their physiological activities. Content of total phenolics was the greatest (92.2 ㎎ㆍℓ⁻¹) in the ethanol extract of red lotus leaves. The α, α-diphenyl-β-picryl-hydrazyl (DPPH) radical scavenging activity of ethanol extracts of flowers and leaves at 500 ㎎ㆍℓ⁻¹ was 94.1% and 83.5%, respectively. However, the activity of hot-water extracts of flowers and leaves was 30.2% and 18.5%, respectively, showing higher activity in the ethanol than hot-water extracts. Contents of total flavonoid in the ethanol extracts of leaves and flowers were 90.2 ㎎ㆍℓ⁻¹ and 46.2 ㎎ㆍℓ⁻¹, respectively. Nitrite scavenging activity (% of the control) of the ethanol extracts at 500 ㎎ㆍℓ⁻¹ from flowers and leaves was 80.7% and 49.7%, respectively. Difference in mushroom tyrosinase inhibition activity (% of the control) of flower and leaf extracts between two extraction methods was not significantly different. Leaf and flower extracts of red lotus at 500 ㎎ㆍℓ⁻¹ showed highly significant anti-microbial activity against six gram positive and three gram negative microbial strains, regardless of plant parts and extraction methods used.
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