• Title/Summary/Keyword: n-Dodecane cracking

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A Study on the Optimization of Ni-ZSM-5 Endothermic Catalyst Preparation for Decomposition of n-Dodecane (n-dodecane 분해를 위한 Ni-ZSM-5 흡열촉매 제조 최적화 연구)

  • Hyeonsu Jeong;Younghee Jang;Ye Hwan Lee;Sung Chul Kim;Byung Hun Jeong;Sung Su Kim
    • Applied Chemistry for Engineering
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    • v.34 no.6
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    • pp.619-625
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    • 2023
  • In order to solve problems caused by the heat load of hypersonic aircraft, this study examined the optimization of the Si/Al ratio of the catalyst and nickel ion exchange to improve the performance of the hydrocarbon decomposition reaction (endothermic reaction). It was confirmed that the catalysts prepared through Si/Al ratio optimization and nickel ion exchange showed about 10% improvement in heat absorption performance compared to thermal cracking at 4 MPa and 550 ℃. FT-IR and NH3-TPD analyses were found to identify factors affecting activity changes, and it was observed that the Si/Al ratio of the HZSM-5 catalyst was closely correlated with acid site development and catalytic activity. In addition, TGA and O2-TPO analyses were conducted to observe the carbon deposition inhibition properties of the nickel-added catalyst.

Thermal Decomposition of High Speed Aircraft Fuel in Supercritical Phase (고속비행체 연료의 초임계조건에서 열분해반응 연구)

  • Kim, Joong-Yeon;Park, Sun-Hee;Chun, Byung-Hee;Kim, Sung-Hyun;Jeong, Byung-Hun;Han, Jeong-Sik
    • Journal of the Korean Society of Propulsion Engineers
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    • v.15 no.5
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    • pp.1-9
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    • 2011
  • Researches on hypersonic aircraft technologies have been carried out to increase flight speeds. However, increase in flight speeds causes heat loads that could lead structural change of aircraft's component. Researches on cooling technologies using endothermic fuels are progressing in the USA, France and Russia to treat the heat loads. Endothermic fuels are liquid hydrocarbon aircraft fuels which are able to absorb the heat loads by undergoing endothermic reactions, such as thermal and catalytic cracking. In this study, methylcyclohexane, n-octane, and n-dodecane were selected as model endothermic fuels and experiments in endothermic properties were implemented. Experimental conditions were supercritical condition of each model fuels in which actual endothermic fuels were exposed. The object of this study is to identify endothermic properties of the model endothermic fuels and to predict endothermic properties of actual fuels such as kerosene fuels.

Thermal Decomposition of High Speed Aircraft Fuel in Supercritical Phase (고속비행체 연료의 초임계조건에서 열분해반응 연구)

  • Kim, Joong-Yeon;Park, Sun-Hee;Chun, Byung-Hee;Kim, Sung-Hyun;Jeong, Byung-Hun;Han, Jeong-Sik
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.279-286
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    • 2010
  • Hypersonic aircraft technologies have been developed with increase in flight speeds. As hypersonic flight speeds increase, heat loads on an aircraft and it's engine increase. Researches on cooling technologies using endothermic fuels are progressing in the USA, France, and Russia to treat the heat loads. Endothermic fuels are liquid hydrocarbon aircraft fuels which are able to absorb the heat loads by undergoing endothermic reactions, such as thermal and catalytic cracking. In this study, methylcyclohexane, n-octane, and n-dodecane were selected as model endothermic fuels and experiments in endothermic properties were implemented. Experimental conditions were supercritical phase of each model fuels in which actual endothermic fuels were exposed. The object of this study is to identify endothermic properties of the model endothermic fuels and to predict endothermic properties of actual fuels such as kerosene fuels.

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