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윤조희,김건중 ( Cho Hee Yoon,Geon Joong Kim ) 한국공업화학회 1997 공업화학 Vol.8 No.3
니켈(Ni)이 담지된 촉매상에서 이산화탄소와 부탄의 직접반응에 의한 합성가스와 탄화수소화합물의 생성을 검토하였다. CO₂와 C₄H_(10)의 반응에서 니켈 담지촉매는 백금 담지촉매와 유사한 활성을 나타내었으며, 부탄의 탈수소에 따른 코크의 누적이 현저하게 나타났다. 담체로 알루미나나 Y형 제올라이트를 사용하면 일산화탄소와 수소가 주생성물이었다. 반면에 니켈을 ZSM-5 형 제올라이트에 담지한 경우에는 생성물 중에 다량의 방향족화합물이 얻어졌다. Ni/ZSM-5, Ni/NaY 및 Ni/알루미나 촉매상에서 반응물 중의 이산화탄소/부탄 몰비의 증가와 함께 이산화탄소의 전환율도 증가하다가 2이상에서 다시 감소하였다. 담체로 ZSM-5를 사용하고 이에 담지되는 니켈의 양을 다르게 하였을 때, 반응물의 전환율은 니켈금속의 담지량이 5wt% 부근에서 가장 높았다. 코크가 누적된 촉매상에 CO₂ 가스나 수증기를 흘리면 코크의 양은 감소하였다. 촉매상에 누적된 코크는 활성이 높은 상태로 결합되어 있으며, 표면의 활성탄소는 반응의 중요한 중간체로 작용하는 것으로 해석된다. The direct reaction of carbon dioxide(CO₂) with butane(C₄H_(10)) to obtain synthesis gas and hydrocarbon compounds have been studied on nickel loaded catalysts. In the reaction of CO₂ with C₄H_(10), Ni loaded catalysts showed similar activity with Pt catalyst and Coke deposition on the catalyst was severe by dehydrogenation of butane. The main products were carbon monoxide and hydrogen, when alumina and Y type zeolite were used as a support. Instead, a great deal of aromatic hydrocarbons were obtained on the Ni loaded ZSM-5 catalyst. The conversion of CO₂ increased with the increasing molar ratio of CO₂ / C₄H_(10) on Ni / ZSM-5, Ni / NaY and Ni / alumina catalyst, but the conversion decreased again from the ratio of 2. The value of CO₂ conversion was the highest at the 5 wt% of Ni loading on ZSM-5 catalyst. A part of cokes deposited on the catalysts diminished when only CO₂ gas or water steam flowed into the reactor. The coke deposited on the catalysts was very reactive and it may be an important intermediate for the carbon dioxide reforming reaction.
혐기 / 무산소 / 호기공법을 이용한 양돈폐수처리에 있어 폭기조의 흐름특성이 유기물 및 질소제거에 미치는 영향
윤조희,김용석 ( Cho Hee Yoon,Yong Suk Kim ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.4
This study was performed to investigate and evaluate the treatabilities and the behavior characteristics of organics and nitrogen in two-type swine wastewater treatment systems using anaerobic-anoxic-oxic (A₂/O) process. Two-type systems were distinguished by flow pattern in oxic process. One was named plug flow reactor(PFR) and another was named completely mixed flow reactor(CMFR). These systems were applied to a laboratory scale reactor in the range 0.2∼1.0 ㎏TOC/㎥/d with a temperature of 22±1℃. And a total of 32 hours hydraulic retention time(HRT) including 8/8/16 hours of anaerobic/anoxic/oxic zones was used to simulate the swine wastewater treatment plants with an average 4,000㎎/L MISS with the external/internal recycle of 100/300 percentage ratios for all experiment. The two systems behaved almost identically for TOC removal efficiency, but a few difference in the TN removal efficiency was observed. Average removal efficiencies for TOC in their two systems were 83.5% and 82.2%, and for TN 78.1% and 75.7%, respectively. High nitrogen loading rates and high ratios of nitrogen and organics were appeared not to be oxided to nitrate nitrogen(NO₃-N) and to cause nitrite nitrogen(NO₂-N) accumulation despite of operating l6 hours HRT for nitrification under oxic process.
물질수지를 이용한 A<sub>2</sub>O 고정생물막법에서의 호기탈질평가
윤조희,박승환,이상훈,김승현,Yoon, Cho-Hee,Park, Seung-Hwan,Lee, Sang-Hoon,Kim, Seung-Hyun 대한환경공학회 2000 대한환경공학회지 Vol.22 No.2
본 연구는 $A_2O$ 공정을 적용한 고정생물막법을 이용하여 고농도의 총무기성질소(TIN) 유입으로 인해 C/N비가 낮은 폐수를 처리하기 위하여 최적의 운전조건 탐색과 생물학적 호기탈질을 평가하였다. 혐기조와 무산소조에 세라믹 여재를 그리고 호기조에 PVC 여재를 충전한 실험장치는 C/N(TOC/TIN)비를 0.5로 일정하게 유지하고 알칼리도를 변화시켜 실험을 실시하였으며 그 결과는 다음과 같다. 유기물제거는 운전조건에 관계없이 96.0% 이상의 높은 제거효율을 얻었다. 유입수의 알칼리도를 약 1210mg/L(Run 5)로 운전하였을 때, $NH_4{^+}-N$와 총 질소 평균 제거효율은 각각 93.5%, 81.8%이었으며, 제거된 총 질소 중 64.9%가 호기조에서 생물학적 탈질에 의해서 제거되었다. 호기조에서 물질수지를 이용하여 질소와 알칼리도를 분석한 결과, 1mg의 $NO_2{^-}-N$가 탈질에 의해 제거될 때 2.49~3.46mg의 알칼리도가 생성되었다. 호기조에서의 생물학적 탈질은 ${\Delta}TOC/{\Delta}DEN$의 이론적인 비 1.22보다 낮은 0.84(Run 5)에서 일어났다. This study was investigated to estimate optimal conditions and biological oxic denitrification to treat wastewater with low C/N ratio and high strength total inorganic nitrogen (TIN) concentration by using $A_2O$ fixed biofilm system. The lab-scale experimental system packed with media, which were composed of polyvinylidene chloride fiber (oxic basin) and ceramic ball (anaerobic and anoxic basin), was used. This system was operated with various influent alkalinities at the C/N(TOC/TIN) ratio of 0.5. The study results showed that TOC were removed over 96.0% at all operation conditions. The removal efficiencies over 93.5% for $NH_4{^+}-N$ and 81.8% for TIN were obtained at the alkalinity of about 1210mg/L(Run 5). Among the removal of TIN, 64.9% was occurred by biological denitrification at an oxic basin. It was confirmed through mass balance of alkalinity and nitrogen that the amount of alkalinity produced during biological denitrification at oxic basin was 2.49~3.46 mg Alkalinity/mg $NO_2{^-}-N$, ${\Delta}TOC/{\Delta}DEN$ of 0.34 (Run 5) was obtained at an oxic basin, which was less than the theoretical value of 1.22.
전기화학 증착법에 의해 합성된 폴리옥소메탈레이트/폴리피롤/탄소천 전극의 전기화학적 특성
윤조희 ( Jo Hee Yoon ),최봉길 ( Bong Gill Choi ) 한국공업화학회 2016 공업화학 Vol.27 No.4
본 연구에서는 폴리옥소메탈레이트(polyoxometalate, POM)가 도핑된 폴리피롤(polypyrrole, Ppy)을 3차원 구조의 탄소천(carbon cloth, CC) 표면 위에 전기화학적 증착법을 이용하여 합성하고 이의 의사커패시터 특성을 순환전압전류법과 정전류 충전-방전법을 사용하여 분석하였다. POM-Ppy의 코팅은 전기화학적 증착 시간에 따라서 얇은 conformal형태의 코팅으로 조절되었다. 제조된 POM-Ppy/CC의 재료 특성은 전자주사현미경과 X-선 분광분석을 사용하여 분석하였다. POM-Ppy/CC의 3차원 나노복합체 구조는 높은 비정전용량(561 mF/cm2), 고속 충방전(85% 용량 유지율) 및 장수명특성(97% 용량 유지율)을 나타내었다. In this report, polyoxometalte (POM)-doped polypyrrole (Ppy) was deposited on surface of three-dimensional carbon cloth (CC) using an electrodeposition method and its pseudocapacitive behavior was investigated using cyclic voltammetry and galvanostatic charge-discharge. The POM-Ppy coating was thin and conformal which can be controlled by electrodeposition time. As-prepared POM-Ppy/CC was characterized using scanning electron microscope and energy-dispersive X-ray spectroscopy. The unique 3D nanocomposite structure of POM-Ppy/CC was capable of delivering excellent charge storage performances: a high areal capacitance (561 mF/cm2), a high rate capability (85%), and a good cycling performance (97% retention).