http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
제올라이트 Y 촉매를 이용한 Cyclopentadiene계 화합물의 이성화 반응 특성 연구
서동욱(Donguk Seo),성민준(Minjun Seong),주형욱(Hyeonguk Ju),권태수(Taesoo Kwon),정병훈(Byeonghun Jeong),한정식(Jeongsik Han) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.5
Multi-cyclic hydrocarbon은 치밀한 구조가 밀도를 높게 하고 추가적인 변형에너지를 야기하기 때문에 이상적인 고밀도 고에너지 연료의 후보이다. 본 연구에서는 다양한 Multi-cyclic Hydrocarbon을 포함한 Cyclopentadiene계 화합물을 Y Zeolite 촉매를 이용하여 회분식 반응기에서 이성화 반응을 수행하고, 전환율과 물질 특성의 상관관계에 대해 알아보았다. 연구결과 이성화 전환율이 증가 할수록 Major로 존재하는 endo형 이성질체가 exo형으로 변환되면서 점도 특성은 향상되고, 밀도, 발열량, 인화점, 색도 특성은 감소하는 것을 확인 할 수 있었다. Multi-cyclic hydrocarbon is a candidate for a high-density-energy fuel because a high density and compact structure results in additional strain energy. The purpose of in this study is evaluating a correlation between conversion rates and material properties of cyclopentadiene compounds containing multi-cyclic hydrocarbon through carrying out isomerization reaction using a Y zeolite catalyst in a batch reactor. The results represent that as the isomerization conversion rate increase, major isomer(endo type) is converted into exo isomer form whose viscosity properties are improved whereas density, total heat of combustion, flash point and saybolt color are decreased.
불균일계 촉매 상에서 Cyclopentadiene계 화합물의 이성화 반응 연구
성민준(Minjun Seong),서동욱(Donguk Seo),주형욱(Hyeong Uk Joo),권태수(Teasoo Kwon),정병훈(Byeonghun Jeong),한정식(Jeongsik Han) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.5
본 연구는 불균일계 촉매 상에서 단위부피당 에너지 함량이 높은 액체 연료인 Cyclopentadiene (CPD)계 화합물의 이성화 반응을 통하여 적용 촉매에 따른 이성화 거동 및 물성(밀도, 발열량, 점도 및 인화점) 변화 연구를 수행하였다. 동일한 반응조건(온도, 압력, 교반속도 등)에서 CPD계 화합물의 이성화 반응을 수행한 결과, Y zeolite 촉매를 사용했을 때 CPD계 화합물의 각 구간에 대하여 높은 전환율을 보였으며 가장 향상된 점도(저온 및 상온) 특성을 나타내었고 Beta zeolite 및 MCM-41 촉매를 사용할 경우에는 반응이 거의 일어나지 않음을 확인할 수 있었다. 또한 이성화 반응에 의해 점도와 밀도/발열량/인화점이 서로 반비례 관계를 보인다는 것을 알 수 있었고, 각 구간의 전환율이 CPD계 화합물의 물성 변화에 미치는 영향을 유추할 수 있었다. Isomerization reaction of cyclopentadiene(CPD) compound liquid fuel with high energy content per unit volume was investigated over heterogenous catalysts to confirm the effect for isomer motion according to the applied catalyst and physical properties(density, heating value, viscosity, flash point) change. Isomerization reaction of CPD compound at the same conditions(temperature, pressure, stirring rate etc.) was showed the high conversion and the most improved viscosity(low and high temperature) property over the Y zeolite. Otherwise, the isomerization reaction of CPD compound was almost not occur when using the Beta zeolite and MCM-41 catalyst. The study confirmed the inverse relationship of viscosity and density/caloric value/flash point through the isomerization reaction of CPD compound. Also, the isomer conversion of CPD compound was able to infer that affects the physical properties change.
Thermal Formation of Polycyclic Aromatic Hydrocarbons from Cyclopentadiene (CPD)
Do Hyong Kim,Jeong Kwon Kim,Seong Ho Jang,James A. Mulholland,Jae Yong Ryu 대한환경공학회 2007 Environmental Engineering Research Vol.12 No.5
Polycyclic aromatic hydrocarbon growth from cyclopentadiene (CPD) pyrolysis was investigated using a laminar flow reactor operating in a temperature range of 600 to 950℃. Major products from CPD pyrolysis are benzene, indene and naphthalene. Formation of observed products from CPD is explained as follows. Addition of the cyclopentadienyl radical to a CPD π-bond produces a resonance-stabilized radical, which further reacts by one of three unimolecular channels: intramolecular addition, C-H bond β-scission, or C-C bond β-scission. The intramolecular addition pathway produces a 7-norbornenyl radical, which then decomposes to indene. Decomposition by C-H bond β-scission produces a biaryl intermediate, which then undergoes a ring fusion sequence that has been proposed for dihydrofulvalene-to-naphthalene conversion. In this study, we propose C-C bond β-scission pathway as an alternative reaction channel to naphthalene from CPD. As preliminary computational analysis, Parametric Method 3 (PM3) molecular calculation suggests that intramolecular addition to form indene is favored at low temperatures and C-C bond β-scission leading to naphthalene is predominant at high temperatures.
Shon, Jeong-Kuk,Sim, Jae-Yi,Thakur, Santosh Singh,Ko, Eun-Mi,Kong, Soo-Sung,Choi, Ji-Yun,Kang, Min,Senapati, Bidyut Kumar,Choi, Doo-Seoung,Ryu, Do-Hyun,Kim, Ji-Man Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.10
In the present work, Diels-Alder reaction of cyclopentadiene with ethylacrylate has been carried out by using two types of mesoporous solid acid catalysts (Al-MCM-41, Al-MCM-48) with different pore structures. The specific topology of Al-MCM-48 (cubic Ia3d structure composed of two independent 3-D channel systems) exhibit higher activity and stereo-control than those of Al-MCM-41 (hexagonal packing of 1-D channels). The physical properties of Al-MCM-48 catalyst, such as high accessibility of reactants to the acid sites, spatial confinement in the nanoscopic reactors, and 3-D channel network structure that are effective adsorption and diffusion of reactants, play a crucial role in the present study.
손정국,심재의,다커산토쉬,고은미,공수성,최지윤,강민,Bidyut Kumar Senapati,최두성,류도현,김지만 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.10
In the present work, Diels-Alder reaction of cyclopentadiene with ethylacrylate has been carried out by using two types of mesoporous solid acid catalysts (Al-MCM-41, Al-MCM-48) with different pore structures. The specific topology of Al-MCM-48 (cubic Ia3d structure composed of two independent 3-D channel systems) exhibit higher activity and stereo-control than those of Al-MCM-41 (hexagonal packing of 1-D channels). The physical properties of Al-MCM-48 catalyst, such as high accessibility of reactants to the acid sites, spatial confinement in the nanoscopic reactors, and 3-D channel network structure that are effective adsorption and diffusion of reactants, play a crucial role in the present study.
Norbornene Dialkyl Ester의 Poly(vinyl chlordie)와 Isoprene Rubber에 친환경 가소제로의 적용 연구
윤대희,박용성,우제완 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
무용자원의 C5 유분 중 CPD를 출발물질로 하여 생산 가능한 화합물 중 norbornene은 육각형의 탄소 구조의 1,4 위치에 메틸기가 다리 형태로 연결되어 있고, 이중결합을 가진 구조로 반응성이 좋아 다양한 유도체를 합성할 수 있다. 본 연구에서는 norboronene dialkyl ester를 합성하여 PVC와 isoprene rubber에 적용한 후 phthalate계 가소제인 DOP와 비교하여 대체 가소제로서의 적용 가능성을 확인하였다. 가소제로의 특성은 PVC와 isoprene rubber에 norbornene dialkyl ester를 일정 비율로 배합 후 인장특성, 경도, 신율, 투과도 및 투명도 등을 측정하여 기계적 물성을 분석하고, 용출성 시험, 유리전이온도, 무니점도 측정을 통해 가소제로의 성능을 DOP를 적용한 경우와 비교하여 확인하였다.
A Study of the Diastereoselectivity of Diels-Alder Reactions on the Ce-SiO2 as Support
Ghodsi Mohammadi Ziarani*,Alireza Badiei,Azam Miralami 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.1
The diastereoselectivity of Diels-Alder reactions were studied on the silica surface supported with different concentrations of cerium ion as efficient Lewis acid catalysts under solvent-free conditions. The results showed that the diastereoselectivity of reaction was highly improved in these conditions. The cerium ion was grafted on silica surface by using ion exchange method.