• Title/Summary/Keyword: $CH_4$ and $CO_2$ conversion

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Conversion Characteristics of CH4 and CO2 in an Atmospheric Pressure Plasma Reactor (대기압 플라즈마 반응기에서의 CH4와 CO2의 전환처리 특성)

  • Kim, Tae Kyung;Lee, Won Gyu
    • Applied Chemistry for Engineering
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    • v.22 no.6
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    • pp.653-657
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    • 2011
  • Conversion characteristics of $CH_4$ and $CO_2$ was studied using an atmospheric pressure plasma for the preparation of synthesis gas composed of $H_2$ and CO. The effects of delivered power, total gas flow rate, and gas residence time in the reactor on the conversion of $CH_4$ and $CO_2$ were evaluated in a plasma reactor with the type of dielectric barrier discharge. The increase of reactor temperature did not affect on the increase of conversion if the temperature does not reach to the appropriate level. The conversion of $CH_4$ and $CO_2$ largely increased with increasing the delivered power. As the $CH_4/CO_2$ ratio increased, the $CH_4$ conversion decreased, whereas the $CO_2$ conversion increased. Generally, the $CH_4$ convesion was higher than the $CO_2$ conversion through the variation of the process parameters.

Conversion of $CO_2$ and $CH_4$ to Syngas by Making Use of Microwave Plasma Torch (전자파 플라즈마 토치를 이용한 이산화탄소와 메탄의 Syngas 합성)

  • Dong Hun, Shin;Yong Cheol, Hong;Han Sup, Uhm
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 2004.11a
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    • pp.195-200
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    • 2004
  • Carbon dioxide ($CO_2$) and methane (CH$_4$) are two major greenhouse Bases. $CO_2$is a stack gas of many industrial processes and the main product of the hydrocarbon combustion. There is recent research interest on the synthesis gas (syngas) formation from $CO_2$ and CH$_4$, via the following reaction: CH$_4$+$CO_2$longrightarrow 2H$_2$+$CO_2$, in order to reduce the greenhouse effects and to synthesize various chemicals, Preliminary experiments were conducted on the conversion of $CO_2$ and CH$_4$ to syngas by making use of a microwave plasma torch at atmospheric pressure. Conversion rates of $CO_2$and CH$_4$ to hydrogen (H$_2$), carbon monoxide (CO) and higher hydrocarbons were investigated using Gas Chromatography (GC) and Fourier Transform Infrared (FTIR). The experimental data indicate that the main products were H$_2$, CO and small amount of higher hydrocarbons, such as ethylene (C$_2$H$_4$).

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A Study on the Synthesis of CH4 from CO2 of Biogas Using 40 wt% Ni-Mg Catalyst: Characteristic Comparison of Commercial Catalyst and 40 wt% Ni Catalyt (40 wt% Ni 촉매에서 바이오가스 중 CO2로부터 메탄제조에 관한 연구: Commercial Catalyst와의 특성 비교분석)

  • HAN, DANBEE;BAEK, YOUNGSOON
    • Transactions of the Korean hydrogen and new energy society
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    • v.32 no.5
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    • pp.388-400
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    • 2021
  • Power to gas (P2G) is one of the energy storage technologies that can increase the storage period and storage capacity compared to the existing battery type. One of P2G technology produces hydrogen by decomposing water from renewable energy (electricity) and the other produces CH4 by reacting hydrogen with CO2. This study is an experimental study to produce CH4 by reacting CO2 of biogas with hydrogen using a 40 wt% Ni-Mg-Al catalyst and a commercial catalyst. Catalyst characteristics were analyzed through H2-TPR, XRD, and XPS instruments of 40% Ni catalyst and commercial catalyst. The effect on the CO2 conversion rate and CH4 selectivity was analyzed, and the activities of a 40% Ni catalyst and a commercial catalyst were compared. As a result of experiment, In the case of a 40 wt% catalyst, the maximum CO2 conversion rate showed 77% at the reaction temperature of 400℃. Meanwhile, the commercial catalyst showed a maximum CO2 conversion rate of 60% at 450℃. When 50% of CO was added to the CO2 methanation reaction, the CO2 conversion rate was increased by about 5%. This is considered to be due to the atmosphere in which the CO reaction can occur without the process of converting to CH4 after forming carbon and CO as intermediates in terms of the CO2 mechanism on the catalyst surface.

A Study on the Reaction Optimization for the Utilization of CO2 and CH4 from Bio-gas (바이오가스에서 CO2/CH4 활용에 관한 반응최적화 연구)

  • KHO, DONGHYUN;CHO, WOOKSANG;BAEK, YOUNGSOON
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.5
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    • pp.554-561
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    • 2016
  • Depending on the Bio-gas sources, main component gases of $CH_4$ and $CO_2$ are shown to be variously present in amounts. For the anaerobic digester, The concentration of $CH_4$ and $CO_2$ in the gases are 60~70 and 30~35 vol%. For the landfill gas, $CH_4$ and $CO_2$ are 40~60 and 40~60 vol%. For the food wastes, $CH_4$ and $CO_2$ are 60~80 and 20~40 vol%, respectively. In this study, maximum conversion rates of $CO_2$ were obtained from the variety of concentrations of $CH_4$ and $CO_2$ by the catalysts of reforming reactions. Moreover, in order to get maximum producing amount of synthetic gas, experimental studies were performed to optimize the reaction variables. On the basis of $CH_4$, 243 ml, R [$CH_4/(O2+CO_2)$] value were varied from 0.8 to 1.35, in the study of $CH_4$ and $CO_2$ reforming reactions. It was shown that the optimal results were obtained for 1.35 of R value. And also, at $850^{\circ}C$ and 1 atm, the production rate of synthetic gas was 90% and the conversion rates of $CH_4$ and $CO_2$ were higher than 99% and 90%, respectively.

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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Reaction Characteristics of Combined Steam and Carbon Dioxide Reforming of Methane Reaction Using Pd-Ni-YSZ Catalyst (Pd-Ni-YSZ 촉매를 이용한 수증기-이산화탄소 복합개질 반응 특성)

  • Kim, Sung Su
    • Applied Chemistry for Engineering
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    • v.29 no.4
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    • pp.382-387
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    • 2018
  • In this study, the reaction characteristics of combined steam and carbon dioxide reforming of methane (CSCRM) reaction using Pd-Ni-YSZ catalyst were investigated according to types of catalysts and gas compositions. Catalysts were prepared in the form of powder and porous disk. The injected gases were supplied at different ratios of $CH_4/CO_2/H_2O$. As a result, the conversion of $CH_4$ and $CO_2$ was improved as a result of using the porous disc type catalyst as compared with that of the powder type catalyst. When the $CH_4/CO_2/H_2O$ ratio of the feed gas was 1 : 0.5 : 0.5, the $H_2/CO$ ratio was adjusted close to 2. However, after 6 hours of the reaction, $CH_4$ conversion was partially reduced by the carbon deposition and the pressure drop increased from 0.1 to 0.8. This issue was then solved by optimizing the water content. As a result, it was confirmed that the durability was secured by preventing the carbon deposition when the gas was supplied at a $CH_4/CO_2/H_2O$ ratio of 1 : 0.5 : 1, and the conversion rate was maintained at a relatively high level.

A Simulation Study on SCR(Steam Carbon Dioxide Reforming) Process Optimization for Fischer-Tropsch Synthesis (Fischer-Tropsch 합성용 SCR(Steam Carbon Dioxide Reforming) 공정 최적화 연구)

  • Kim, Yong Heon;Koo, Kee Young;Song, In Kyu
    • Korean Chemical Engineering Research
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    • v.47 no.6
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    • pp.700-704
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    • 2009
  • A simulation study on SCR(steam carbon dioxide reforming) in gas-to-liquid(natural gas to Fischer-Tropsch synthetic fuel) process was carried out in order to find optimum reaction conditions for SCR experiment. Optimum operating conditions for SCR process were determined by changing reaction variables such as temperature and $CH_4/steam/CO_2$ feed ratio. Simulation was carried out by Aspen Plus. During the simulation, overall process was assumed to proceed under steady-state conditions. It was also assumed that physical properties of reaction medium were governed by RKS(Redlich-Kwong-Soave) equation. Optimum simulation variables such as temperature and feed ratio were determined by considering $H_2/CO$ ratio for FTS(Fischer-Tropsch synthesis), $CH_4$ conversion, and $CO_2$ conversion. Simulation results showed that optimum reaction temperature and $CH_4/steam/CO_2$ feed ratio in SCR process were $850^{\circ}C$ and 1.0/1.6/0.7, respectively. Under optimum temperature of $850^{\circ}C$, $CH_4$ conversion and $CO_2$ conversion were found to be 99% and 49%, respectively.

Production of Solar Fuel by Plasma Oxidation Destruction-Carbon Material Gasification Conversion (플라즈마 산화분해-탄화물 가스화 전환에 의한 태양연료 생산)

  • Song, Hee Gaen;Chun, Young Nam
    • Clean Technology
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    • v.26 no.1
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    • pp.72-78
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    • 2020
  • The use of fossil fuel and biogas production causes air pollution and climate change problems. Research endeavors continue to focus on converting methane and carbon dioxide, which are the major causes of climate change, into quality energy sources. In this study, a novel plasma-carbon converter was proposed to convert biogas into high quality gas, which is linked to photovoltaic and wind power and which poses a problem on generating electric power continuously. The characteristics of conversion and gas production were investigated to find a possibility for biogas conversion, involving parametric tests according to the change in the main influence variables, such as O2/C ratio, total gas feed rate, and CO2/CH4 ratio. A higher O2/C ratio gave higher conversions of methane and carbon dioxide. Total gas feed rate showed maximum conversion at a certain specified value. When CO2/CH4 feed ratio was decreased, both conversions increased. As a result, the production of solar fuel by plasma oxidation destruction-carbon material gasification conversion, which was newly suggested in this study, could be known as a possibly useful technology. When O2/C ratio was 0.8 and CO2/CH4 was 0.67 while the total gas supply was at 40 L min-1 (VHSV = 1.37), the maximum conversions of carbon dioxide and methane were achieved. The results gave the highest production for hydrogen and carbon dioxide which were high-quality fuel.

A Study on the CO2 Methanation in Power to Gas (P2G) over Ni-Catalysts (Ni 촉매 상에서 Power to Gas (P2G) 기술의 CO2 메탄화 반응에 관한 연구)

  • YEOM, GYUIN;SEO, MYUNGWON;BAEK, YOUNGSOON
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.1
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    • pp.14-20
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    • 2019
  • The power to gas (P2G) is one of the energy storage technologies that can increase the storage period and storage capacity compared to the existing battery type. One of P2G technologies produces hydrogen by decomposing water from renewable energy (electricity) and the other produces $CH_4$ by reacting hydrogen with $CO_2$. The objective of this study is the reaction of $CO_2$ methanation which synthesized methane by reacting carbon dioxide and hydrogen. The effect of $CO_2$ conversion and $CH_4$ selectivity on reaction temperature, pressure, and methane contents over 40% Ni catalyst was mainly investigated throughout this study. As a result, the activity of this catalyst appeared to be the highest in $CH_4$ yield at around $400^{\circ}C$ and the selectivity of $CH_4$ increased with increasing reaction pressure. The methane content was not significantly influenced below 3% of all componets. As the space velocity increases from 10,000 to 30,000/hr, the $CO_2$ conversion rate tends to decrease.

Production of Hydrogen-Rich Gas from Methane by a Thermal Plasma Reforming (고온 플라즈마 개질에 의한 메탄으로부터 고농도 수소생산)

  • Kim, Seong-Cheon;Lim, Mun-Sup;Chun, Young-Nam
    • Transactions of the Korean hydrogen and new energy society
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    • v.17 no.4
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    • pp.362-370
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    • 2006
  • The purpose of this paper was to investigate the reforming characteristics and optimum operating condition of the plasmatron assisted $CH_4$ reforming reaction for the hydrogen-rich gas production. Also, in order to increase the hydrogen production and the methane conversion rate, parametric screening studies were conducted, in which there were the variations of the $CH_4$ flow ratio, $CO_2$ flow ratio, vapor flow ratio, mixing flow ratio and catalyst addition in reactor. High temperature plasma flame was generated by air and arc discharge. The air flow rate and input electric power were fixed 5.1 l/min and 6.4 kW, respectively. When the $CH_4$ flow ratio was 38.5%, the production of hydrogen was maximized and optimal methane conversion rate was 99.2%. Under these optimal conditions, the following synthesis gas concentrations were determined: $H_2$, 45.4%; CO, 6.9%; $CO_2$, 1.5%; and $C_2H_2$, 1.1%. The $H_2/CO$ ratio was 6.6, hydrogen yield was 78.8% and energy conversion rate was 63.6%.