• Title, Summary, Keyword: dry reforming

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Study on dry reforming and partial oxidation of methane. (대기압 플라즈마를 이용한 메탄의 건식개질과 부분산화반응의 비교)

  • Hwang, Na-Kyung;Cha, Min-Suk;Lee, Dae-Hoon;Song, Young-Hoon
    • Proceedings of the KSME Conference
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    • pp.2892-2897
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    • 2008
  • Plasma techniques have been proposed to generate a hydrogen enrich gas to investigate a feasibility of plasma techniques on a fuel reforming, we considered a dry reforming and a partial oxidation with methane in the atmospheric pressure. For these experiments, we employed an arc jet plasma reactor. The effects of input power and oxidizer in each process were investigated by product analysis, including carbon monoxide, hydrogen, ethylene, propane, and acetylene as well as methane and carbon dioxide. In both processes, input electrical power activated the reactions significantly. The increased ratio of the carbon dioxide to methane in the dry reforming doesn't affect to a methane conversion, whereas increased ratio of oxidizer to methane in the partial oxidation was very effective for the reaction. Moreover, for a simultaneous treatment of methane and carbon dioxide, a feasibility of a dry reforming combined with partial oxidation also has been investigated.

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The Study on Methane Reforming by CO2 and Steam for Manufacture of Synthesis Gas (합성가스 제조를 위한 CO2/수증기에 의한 메탄 개질반응 연구)

  • Cho, Wonihl;Lee, Seung-Ho;Mo, Yong-Gi;Sin, Donggeun;Baek, Youngsoon
    • Transactions of the Korean hydrogen and new energy society
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    • v.15 no.4
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    • pp.301-308
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    • 2004
  • The methane reforming with $CO_2$ and steam for manufacture of synthesis gas over $Ni/ZrO_2$ catalyst was investigated. Mixed reforming carried out $CO_2$ dry reforming with $O_2$ and steam for development of DME process in pilot plant. To improve a catalyst deactivation by coke formation, the mixed reforming added carbon dioxide and steam as a oxidizer of the methane reforming was suggested. The result of experiments over commercial catalyst in $CO_2$ dry reforming has shown that the catalyst activity decrease rapidly after 20 hours. In case of $NiO-MgO/Al_2O_3$ catalyst, the deactivation of 20 percent after 30 hours was occurred. The activity of Ni/C catalyst still was not decreased dramatically after 100 hours. The effect of $H_2$ reforming with steam over $Ni/CO_2$ catalyst obtained the optimal conversion of methane and carbon dioxide, and could be produced synthesis gas at ratio of $H_2/CO$ under 1.5.

CH4 Dry Reforming on Alumina-Supported Nickel Catalyst

  • Joo, Oh-Shim;Jung, Kwang-Deog
    • Bulletin of the Korean Chemical Society
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    • v.23 no.8
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    • pp.1149-1153
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    • 2002
  • CH4/CO2 dry reforming was carried out to make syn gas on the Ni/Al2O3 catalysts calcined at different temperatures. The Ni/Al2O3 (850 $^{\circ}C)$ catalyst gave good activity and stability w hereas the Ni/Al2O3 $(450^{\circ}C)$ catalyst showed lower activity and stability. The NiO/Al2O3 catalyst calcined at $850^{\circ}C$ for 16 h (Ni/Al2O3 $(850^{\circ}C))$ formed the spinel structure of nickel aluminate, which was confirmed by TPR. The carbon formation rate on the Ni/Al2O3 $(850^{\circ}C)$ catalyst was very low till 20 h, and then steeply increased with reaction time without decreasing the activity for CH4 reforming. The Ni/Al2O3 $(450^{\circ}C)$ catalyst showed high carbon formation rate at the initial reaction time and then, the rate nearly stopped with continuous decreasing the activity for CH4 reforming. Even though the amount of carbon deposition on the Ni/Al2O3 $(850^{\circ}C)$ catalyst was higher than that on the Ni/Al2O3 $(450^{\circ}C)$ catalyst, the activity for CH4ing was also high, which could be attributed to the different type of the carbon formed on the catalyst surface.

Effects of $CO_2$ and $O_2$ Addition on Methane Dry Reforming Using Arc-Jet Plasma Reactor (아크제트 플라즈마를 이용한 메탄건식개질 반응에서 $CO_2$$O_2$ 첨가의 영향)

  • Hwang, N.K.;Cha, M.S.;Song, Y.H.
    • Journal of the Korean Society of Combustion
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    • v.13 no.4
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    • pp.47-53
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    • 2008
  • The reaction mechanism of methane dry reforming has been investigated using an arc-jet reactor. The effects of input power, $CO_2/CH_4$ and added $O_2$ were investigated by product analysis, including CO, $H_2$, $C_{2}H_{Y}$ and $C_{3}H_{Y}$ as well as $CH_4$ and $CO_2$. In the process, input electrical power activated the reactions between $CH_4$ and $CO_2$ significantly. The increased feed ratio of the $CO_2$ to $CH_4$ in the dry reforming does not affect to the $CH_4$ conversion. but we could observe increase in CO selectivity together with decreasing $H_2$ generation. Added oxygen can also increase not only CO selectivity but also $CH_4$ conversion. However, hydrogen selectivity was decreased significantly due to a increased $H_{2}O$ formation.

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Methane Dry Reforming over Ru/CeO2 catalysts (Ru/CeO2 촉매를 이용한 메탄 건식 개질)

  • HIEN, NGUYEN THI BICH;JEON, MINA;RIDWAN, MUHAMMAD;TAMARANY, RIZCKY;YOON, CHANG WON
    • Transactions of the Korean hydrogen and new energy society
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    • v.26 no.3
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    • pp.221-226
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    • 2015
  • Ru catalysts supported on $CeO_2$ were synthesized by an impregnation method and characterized by numerous analytical techniques including X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), transmission electron microscopy (TEM), and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS). Upon utilization of these catalysts for methane dry reforming with a $CH_4/CO_2$ ratio of 1:1 at different temperatures ranging from 550 to $750^{\circ}C$, the $Ru/CeO_2$ catalysts have shown to be active. In particular, Ru(0.55wt%) supported on $CeO_2$ (1) prepared by a hydrothermal method exhibited excellent activity with the conversion of > 75% at $750^{\circ}C$. In addition, the catalyst also proved to be highly stable for at least 47 h without catalyst deactivation under the dry reforming conditions.

Optimal Design of Carbon Dioxide Dry Reformer for Suppressing Coke Formation (코크 생성 억제를 위한 이산화탄소 건식 개질 반응기의 최적 설계)

  • Lee, Jongwon;Han, Myungwan;Kim, Beomsik
    • Korean Chemical Engineering Research
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    • v.56 no.2
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    • pp.176-185
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    • 2018
  • As global warming accelerates, greenhouse gas reduction becomes more important. Carbon dioxide dry reforming is a promising green-house gas reduction technology that can obtain CO and $H_2$ which are high value-added materials by utilizing $CO_2$ and $CH_4$ which are greenhouse gases. However, there is a significant coking problem during operation of the dry reforming reactor. Because the carbon dioxide dry reforming is a strong endothermic reaction, the temperature of the reactor drops near the reactor inlet and causes coke formation. To solve this problem, it is important to ensure that the reaction takes place in a temperature range where coke production is minimized. In this study, we proposed a design method that can maintain reaction temperature in the region where the coke is rarely generated by using the new catalyst configuration method. The design method also optimizes the reactor by solving the optimization problem which minimizes the reactor length for a given reaction conversion by using the fuel flow rate, catalyst density, and output temperature by section as optimization variables.

Recent Progress for Hydrogen Production from Biogas and Its Effective Applications (바이오가스 유래 수소 제조 기술 동향 및 효과적인 적용)

  • Song, Hyoungwoon;Jung, Hee Suk;Uhm, Sunghyun
    • Applied Chemistry for Engineering
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    • v.31 no.1
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    • pp.1-6
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    • 2020
  • Hydrogen production from biogas has received consistent attention due to the great potential to solve simultaneously the issues of energy demands and environmental problems. Practically, biomethane produced by purification/upgrading of biogas can be a good alternative to the natural gas which is a main reactant for a steam methane reforming process. Judging from the economic and environmental impacts, however, the steam biogas and dry reforming are considered to be more effective routes for hydrogen production because both processes do not require the carbon dioxide elimination step. Herein, we highlight recent studies of hydrogen production via reforming processes using biogas and effective applications for earlier commercialization.

Methane Reforming Using Atmospheric Plasma Source (대기압 플라즈마를 이용한 메탄 개질 반응)

  • Lee, Dae-Hoon;Kim, Kwan-Tae;Cha, Min-Suk;Song, Young-Hoon;Kim, Dong-Hyeon
    • 한국연소학회:학술대회논문집
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    • pp.64-68
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    • 2005
  • Methane reforming processes to obtain hydrogen were investigated experimentally by using atmospheric plasma source. Among possible reforming processes, such as a $CO_2$ reforming(dry reforming), a partial oxidation (POx), a steam reforming(SR), and a steam reforming with oxygen(SRO or auto-thermal reforming), partial oxidation and the steam reforming with oxygen were considered. We choose a rotating arc plasma as an atmospheric plasma source, since it shows the best performances in our preliminary tests in terms of a methane conversion, a hydrogen production, and a power consumption. Then, the effects of a feeding flow-rate, an electrical power input to a plasma reaction, an $O_2/C$ ratio and a steam to carbon ratio in the case of SRO on the reforming characteristics were observed systematically. As results, at a certain condition almost 100% of methane conversion was obtained and we could achieve the same hydrogen production rate by consuming a half of electrical power which was used by the best results for other researchers.

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Polymeric Material Application for The Production of Ceramic Foam Catalyst

  • Sangsuriyan, Anucha;Yeetsorn, Rungsima;Tungkamani, Sabaithip;Sornchamni, Thana
    • International Journal of Advanced Culture Technology
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    • v.3 no.1
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    • pp.21-30
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    • 2015
  • Ceramic foams are prepared as positive images corresponding to a plastic foam structure which exhibits high porosities (85-90%). This structure makes the ceramic foams attractive as a catalyst in a dry reforming process, because it could reduce a high pressure drop problem. This problem causes low mass and heat transfers in the process. Furthermore, the reactants would shortly contact to catalyst surface, thus low conversion could occur. Therefore, this research addressed the preparation of dry reforming catalysts using a sol-gel catalyst preparation via a polymeric sponge method. The specific objectives of this work are to investigate the effects of polymer foam structure (such as porosity, pore sizes, and cell characteristics) on a catalyst performance and to observe the influences of catalyst preparation parameters to yield a replica of the original structure of polymeric foam. To accomplish these objectives industrial waste foams, polyurethane (PU) and polyvinyl alcohol (PVA) foams, were used as a polymeric template. Results indicated that the porosity of the polyurethane and polyvinyl alcohol foams were about 99% and 97%. Their average cell sizes were approximate 200 and 50 micrometres, respectively. The cell characteristics of polymer foams exhibited the character of a high permeability material that can be able to dip with ceramic slurry, which was synthesized with various viscosities, during a catalyst preparation step. Next, morphology of ceramic foams was explored using scanning electron microscopy (SEM), and catalyst properties, such as; temperature profile of catalyst reduction, metal dispersion, and surface area, were also characterized by $H_2-TPR$ and $H_2-TPD$ techniques, and BET, respectively. From the results, it was found that metal-particle dispersion was relatively high about 5.89%, whereas the surface area of ceramic foam catalysts was $64.52m^2/g$. Finally, the catalytic behaviour toward hydrogen production through the dry reforming of methane using a fixed-bed reactor was evaluated under certain operating conditions. The approaches from this research provide a direction for further improvement of marketable environmental friendly catalyst production.

A Study on the Effects of pH and Ni/Mo Mole Ratio during Wet Impregnation on the Characteristics and Methane Dry Reforming Reactivity of Activated Charcoal Supported Ni-Mo Carbide Catalyst (습식담지시 pH와 Ni/Mo 몰비가 Ni-Mo/AC 카바이드 촉매의 특성과 메탄건식개질 반응성에 미치는 영향)

  • Lee, Dongmin;Hwang, Unyeon;Park, Hyungsang;Park, Sungyoul;Kim, Seongsoo
    • Transactions of the Korean hydrogen and new energy society
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    • v.25 no.4
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    • pp.344-354
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    • 2014
  • Activated charcoal supported nickel molybdenum carbide (carburized Ni-Mo/AC) catalysts were prepared by wet-impregnation followed by temperature-programmed carburization using 20% $CH_4/H_2$ gas. The effects of pH and initial Ni/Mo mole ratio during wet-impregnation step on the characteristics of the carburized Ni-Mo/AC catalysts were investigated using ICP, XRD, XPS, BET and $CO_2$-TPD techniques, and correlated with the catalytic activity of the carburized Ni-Mo/AC in methane dry reforming reaction. Comparison of the results of methane dry reforming reaction kinetics with the results of characterization of the carburized Ni-Mo/AC catalyst showed that the catalytic activity in methane dry reforming reaction was higher at higher initial Ni/Mo mole ratio or at lower pH(3~natural value). This phenomenon was related to the crystal size of metallic Ni in the carburized Ni-Mo/AC catalyst.