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단신 : 분무 열분해법을 이용해 제조된 VO(x)/Mesoporous Titania 상에서 1,2-dichlorobenzene의 분해반응에 대한 in situ FT-IR 연구
전종기 ( Jong Ki Jeon ),정경열 ( Kyeong Youl Jung ),박영권 ( Young Kwon Park ) 한국공업화학회 2011 공업화학 Vol.22 No.5
본 연구에서는 분무 열분해 방법으로 제조된 메조기공 V2O5/TiO2 촉매 상에서 1,2-dichlorobenzene (1,2-DCB)의 표면 활성종을 파악하고자 하였다. 이를 위하여 in situ FT-IR cell을 이용하여 1,2-DCB의 흡착/탈착을 수행하였다. 또한 기존의 TiO2와 incipient wetness로 제조된 V2O5/TiO2 상의 흡착종들과의 비교도 함께 수행되었다. In this study, surface-adsorbed species of 1,2-dichlorobenzene (1,2-DCB) on mesoporous V2O5/TiO2 catalysts synthesized by spray pyrolysis were investigated through the adsorption/desorption performed using in situ FT-IR cell. Also, the comparison of adsorbed species with TiO2 and V2O5/TiO2 synthesized by the incipient wetness was carried out.
전종기,정경열,박영권,Jeon, Jong-Ki,Jung, Kyeong Youl,Park, Young-Kwon The Korean Society of Industrial and Engineering C 2011 공업화학 Vol.22 No.5
본 연구에서는 분무 열분해 방법으로 제조된 메조기공 $V_2O_5/TiO_2$ 촉매 상에서 1,2-dichlorobenzene (1,2-DCB)의 표면 활성종을 파악하고자 하였다. 이를 위하여 in situ FT-IR cell을 이용하여 1,2-DCB의 흡착/탈착을 수행하였다. 또한 기존의 $TiO_2$와 incipient wetness로 제조된 $V_2O_5/TiO_2$ 상의 흡착종들과의 비교도 함께 수행되었다. In this study, surface-adsorbed species of 1,2-dichlorobenzene (1,2-DCB) on mesoporous $V_2O_5/TiO_2$ catalysts synthesized by spray pyrolysis were investigated through the adsorption/desorption performed using in situ FT-IR cell. Also, the comparison of adsorbed species with $TiO_2$ and $V_2O_5/TiO_2$ synthesized by the incipient wetness was carried out.
백금/헥사알루미네이트 펠렛 촉매를 이용한 친환경 액체 추진제 분해
조현민,유달산,김문정,우재규,정경열,조영민,전종기 한국청정기술학회 2018 청정기술 Vol.24 No.4
The objective of this study is to develop a platinum/hexaaluminate pellet catalyst for the decomposition of eco-friendly liquid propellant. Pellet catalysts using hexaaluminate prepared by ultrasonic spray pyrolysis as a support and platinum as an active metal were prepared by two methods. In the case of the pellet catalyst formed by loading the platinum precursor onto the hexaaluminate powder and then adding the binder (M1 method catalyst), the mesopores were well developed in the catalyst after calcination at 550 ℃. However, when this catalyst was calcined at 1,200 ℃, the mesopores almost collapsed and only a few macropores existed. On the other hand, in the case of a catalyst in which platinum was supported on pellets after the pellet was produced by extrusion of hexaaluminate (M2 method catalyst), the surface area and the mesopores were well maintained even after calcination at 1,200 ℃. Also, the catalyst prepared by the M2 method showed better heat resistance in terms of platinum dispersion. The effects of preparation method and calcination temperature of Pt/hexaaluminate pellet catalysts on the decomposition of liquid propellant composed mainly of ammonium dinitramide (ADN) or hydroxyl ammonium nitrate (HAN) were investigated. It was confirmed that the decomposition onset temperature during the decomposition of ADN- or HAN- based liquid propellant could be reduced significantly by using Pt/hexaaluminate pellet catalysts. Especially, in the case of the catalyst prepared by the M2 method, the decomposition onset temperature did not show a large change even when the calcination temperature was raised at 1,200 ℃. Therefore, it was confirmed that Pt/ hexaaluminate pellet catalyst prepared by M2 method has heat resistance and potential as a catalyst for the decomposition of the eco-friendly liquid propellants. 본 연구의 목적은 친환경 액체 추진제 분해반응에 적용하기 위하여 백금이 담지된 헥사알루미네이트 펠렛 촉매를 개발하는것이다. 초음파 분무 열분해법으로 제조한 hexaaluminate를 지지체로 사용하고 백금을 활성금속으로 사용한 펠렛 촉매를 두가지 방법으로 제조하였다. 백금 전구체를 헥사알루미네이트 분말에 담지한 후에 바인더를 첨가하여 성형한 펠렛 촉매의경우(M1 method 촉매), 550 ℃에서 소성한 촉매는 메조기공이 잘 발달하였다. 그러나 이 촉매를 1,200 ℃에서 소성하면 메조기공이 거의 무너지고 약간의 거대기공만 존재하였다. 반면에, 헥사알루미네이트를 성형하여 펠렛을 제조한 후, 펠렛 위에백금을 담지한 촉매의 경우(M2 method 촉매), 1,200 ℃에서 소성한 후에도 표면적과 메조기공이 잘 유지되는 것으로 나타났다. 또한, 백금 분산도 측면에서도 M2 method로 제조한 촉매의 내열성이 더 우수하였다. 펠렛 촉매 제조 방법과 소성온도가ammonium dinitramide (ADN) 또는 hydroxyl ammonium nitrate (HAN)을 주성분으로 하는 액상 추진제의 분해반응에 미치는 영향을 분석하였다. ADN 기반 액체 추진제 및 HAN 기반 액체추진제의 분해반응에서 Pt/hexaaluminate 펠렛 촉매를 사용하면 분해 개시 온도를 큰 폭으로 내릴 수 있음을 확인하였다. 특히, M2 method로 제조한 촉매의 경우, 소성온도를 1,200 ℃로 올린 경우에도 분해 개시 온도가 큰 변화를 보이지 않았다. 따라서 M2 method로 제조한 Pt/hexaaluminate 펠렛 촉매가내열성을 보유하고 있으며, 친환경 액상 추진제의 분해 반응용 촉매로서 잠재력이 있다는 것을 확인하였다.
자전거와 비교한 개인용 이동장치 사고의 손상 심각성 및 사고 유발 요인
전종복,장재호,임용수,최재연,조진성,우재혁,최우성,양혁준,현성열 대한응급의학회 2020 대한응급의학회지 Vol.31 No.2
Objective: Personal mobility vehicles (PMV) have been used widely as a means of replacing bicycles in recent years because of their convenience and high economic efficiency. On the other hand, accidents related to PMV are also increasing, but there have been few studies in this area. This study examined the factors that increase the severity of damage and determine the characteristics of the PMV compared to the accidents on a bicycle. Methods: Retrospective observational studies were performed. The variables related to the accident were collected and analyzed for patients who visited the emergency room due to a PMV and bicycle accident. Multivariate logistic regression analysis was used to determine the factors affecting the severity of the patients. The odds ratios were calculated and compared between injuries related to PMV and bicycles. Results: A total of 1,124 patients (bicycles 1,017, PMV 107) were enrolled in this study. In multivariate regression analysis, the severity of PMV was higher (odds ratio [OR], 1.73; 95% confidence interval [CI], 1.06-2.83) than that of a bicycle. The factors affecting the severity of the patients were age (OR, 1.02, 95% CI, 1.01-1.03), alcohol use (OR, 1,70; 95% CI, 1.04-2.70), ambulance transport (OR, 2.46; 95% CI, 1.78-3.40), and wearing a helmet (OR, 2.06; 95% CI, 1.36-3.13). Conclusion: PMV showed higher severity of damage than a bicycle. The PMV, which is a new transportation means, is insufficient for the prevention of safety compared to bicycles where driving regulations and wearing protective equipment are common. Additional studies on the precise mechanisms of injury and damage are expected to prevent accidents and reduce their severity.
박용기,전종열,한상윤,김정리,이철위 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.5
세계적으로 에틸렌 생산공장에서 배출되는 이산화탄소의 양은 매년 141백만 톤에 이르며, 석유화학산업에서 소비되는 전체 에너지 중 약 40%는 나프타 스팀크래킹에 사용된다. 이로인한 지구 온난화를 막기 위하여 에너지 효율 증대를 통하여 이산화탄소 배출양을 최소화할 수 있는 나프타 크래킹 기술개발이 시급하다. 또한 천연가스로부터 얻어지는 에틸렌의 양이 점점 증가하기 때문에 프로필렌/에틸렌 비를 증대하기 위한 연구가 필요한 실정이다. 그러므로 에틸렌과 프로필렌 수요를 맞추기 위한 thermal cracking의 대안으로 촉매를 이용한 크래킹기술이 시도되고 있다. 본 논문에서는 나프타로부터 에틸렌, 프로필렌 등과 같은 경질 올레핀 제조에 관하여 지난 수 년간 공개된 특허와 실용화 가능한 공정 기술을 소개하고자 한다. In the whole world, the amount of CO₂ emission from the ethylene plant is about 141 million tons per year, and currently about 40% of the energy in petrochemical industry is used for steam cracking of naphtha. So, global warming issues have stimulated the development of new cracking process of naphtha which can minimize CO₂ emission through the increase of energy efficiency. Also there is an effort to increase the ratio of propylene/ethylene in naphtha cracking since the natural gas cracker which can produce ethylene preferentially increases more and more. Therefore, catalytic cracking of naphtha has been studied as an alternative of thermal cracking to balance ethylene and propylene demand and to reduce CO₂ emission. This paper will review the various routes which have been investigated and applied over the past years, hut will focus particularly on the recently patented and commercially demonstrated processes for the production of lower olefins from naphtha.