• Title, Summary, Keyword: 일산화탄소

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Kinetics of the Oxidation of Carbon Monoxide on NiO at Low Temperature (저온 일산화탄소의 산화반응속도론적 연구)

  • Choi, Jae-Shi;Kim, Keu-Hong
    • Journal of the Korean Chemical Society
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    • v.18 no.2
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    • pp.117-125
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    • 1974
  • The catalytic reaction between carbon monoxide and oxygen was investigated in the presence of catalysts which were specially treated by applying an annealing method at different monoxide and oxygen and at reaction temperatures in the region of partial pressures of carbon $40^{\circ}C$ to $95^{\circ}C$. The oxidation rate is highest on NiO annealed at low temperature in vacuum. The data has been correlated with the first order kinetics, and the activation energies from the Arrhenius equation are found to be 4Kcal/mole in the region of the experimental temperatures. The excess oxygen in NiO obtained from the decomposition of $NiCO_3$does not cause activation at $95^{\circ}C$. But NiO catalysts annealed again in vacuum display activation even at $40^{\circ}C$. The quantity of the excess oxygen in NiO surfaces seems to be the controlling factor in determining the rates of oxidation of carbon monoxide.

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Glycerol Carbonate Synthesis by Glycerol Oxidative Carbonylation over Copper Catalysts (구리 촉매상에서 글리세롤의 산화 카르보닐화 반응에 의한 글리세롤 카보네이트 합성)

  • Choi, Jae Hyung;Lee, Sang Deuk;Woo, Hee Chul
    • Clean Technology
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    • v.19 no.4
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    • pp.416-422
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    • 2013
  • In environmental friendly aspects, the synthesis of glycerol carbonate from glycerol using carbon monoxide and oxygen gases which were produced in petrochemical plants was studied. The oxidative carbonylation of glycerol under batch reaction system was performed on parameter conditions such as effect of various metals (Cu, Pd, Fe, Sn, Zn, Cr), oxidizing agents, mole ratio of carbon monoxide to oxygen, catalyst amount, solvent types, reaction temperature and time and dehydrating agents. In particular copper chloride catalysts showed the excellent activities, and the glycerol carbonate yields over CuCl and $CuCl_2$ catalysts were the maximum of 44% and 64%, respectively at the following reaction conditions: solvent as nitrobenzene, mole ratio of 1:3:0.15 (glycerol:carbon monoxide:catalyst), mole ratio of 2:1 (carbon monoxide:oxygen), the total pressure of 30 bar at 413 K for 4 hr. It was found that reactivity were significantly different depending on the oxidation number of Cu catalysts, and oxygen plays an important role as oxidizing agents in producing H2O during oxidation reaction after carbonylation of glycerol.

Effect of Water Addition on Activity of Gold Catalysts Supported on Metal Oxide at Low Temperature CO Oxidation (일산화탄소 저온 산화에서 금속산화물에 담지된 금촉매의 활성에 미치는 수분첨가의 영향)

  • Ahn, Ho-Geun;Kim, Ki-Joong;Chung, Min-Chul
    • Korean Chemical Engineering Research
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    • v.49 no.6
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    • pp.720-725
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    • 2011
  • Gold catalysts supported on metal-oxides were prepared by co-precipitation using the various metal nitrates and chloroauric acid as precursors, and effect of water addition on the catalytic activity in CO oxidation was investigated. Among the various supported gold catalysts, Au/$Co_{3}O_{4}$ and Au/ZnO catalysts showed the excellent activity for CO oxidation. Water in the reactant gas had a negative effect on the oxidation activity over Au/$Co_{3}O_{4}$ catalysts and a positive effect on that over Au/ZnO, which means the activity depends strongly on the nature of support. It was also confirmed that no significant change in the particle size of gold was observed after reaction both in dry and wet conditions. This fact suggested that the deactivated catalyst due to a carbonate species could be regenerated by water addition in the reactant gas.

Design of Water Gas Shift Reactor for Rapid Start-Up in 200 W Portable Fuel Cell System (200 W급 휴대용 연료전지 시스템의 빠른 기동 특성을 위한 수성 가스 반응기 설계)

  • Choi, Jong-Rock;Lee, Sungchul
    • Korean Chemical Engineering Research
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    • v.51 no.4
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    • pp.455-459
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    • 2013
  • The fuel processor for the portable fuel cell includes multi-step processes consisting of hydrogen generator, heat generator and several CO clean-up stages. One of requirements of the fuel processor for portable fuel cell system is a rapid start-up time. Especially, the warm-up time for WGS reactor is crucial factors for total start-up time. In this paper, active heating protocol, which is the heating protocol of WGS reactor supplied by the oxidation of CO rich reformate in the initial stage, is used for a rapid start-up. The air stream fed to the inlet of WGS reactor rapidly oxidize the CO rich reformate in the WGS reactor. Therefore, CO concentration in reformate quickly stabilized at the desired concentration without CO surges.

Numerical Study on the CO and NO of Rocket Plume as the Type of Water Injection in the Flame Guiding Duct (화염유도로 냉각수 분사방식에 따른 로켓 플룸의 CO와 NO 반응의 수치해석)

  • Kim, Seong-Lyong;Kim, Seung-Han;Han, Yeoungmin
    • Journal of the Korean Society of Propulsion Engineers
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    • v.19 no.3
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    • pp.39-46
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    • 2015
  • A numerical study has been conducted on CO after burning and NO generation of the rocket plume as the cooling water injected to the rocket plume. The present study shows that the cooling water has a role of increasing the degree of CO after burning and reducing NO generation. However the effect varies as the injection configuration of the cooling water. When the cooling water is injected at the side of the plume, NO generation is dramatically reduced while the degree of CO after burning is relatively low. When the cooling water is injected at the side and the center of the plume, CO after burning is highly increased and NO generation is also dramatically reduced.