• Title/Summary/Keyword: methane adsorption

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Experimental Study on the Adsorption Characteristics of Methane Gas Considering Coalbed Depth in Coalbed Methane Reservoirs (석탄층 메탄가스 저류층에서 탄층 심도를 고려한 메탄가스의 흡착 특성에 관한 실험 연구)

  • Chayoung Song;Dongjin Lee;Jeonghwan Lee
    • Journal of the Korean Institute of Gas
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    • v.27 no.2
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    • pp.39-48
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    • 2023
  • This study presents the experimental results to measure the adsorption amount of methane gas by coal according to the conditions of a coalbed methane (CBM) reservoir. Adsorbed gas to coal seam particles was measured under reservoir conditions (normal pressure ~ 1,200 psi pressure range, temperature range15 ~ 45℃) using coal samples obtained from random mines in Kalimantan Island, North Indonesia. The obtained amount of absolute adsorbed gas was applied to triangular with linear interpolation to calculate the maximum amount of adsorbed gas according to temperature and pressure change, at which no experiment was performed. As a result, it was revealed that the amount of adsorbed gas to coal particles increased as the pressure increased and temperature decreased, but the increase of the amount of adsorbed gas decreased at more than an appropriate depth(1,000 ft). In the cleat permeability and cleat porosity for each depth of the coal bed considering the effective stress, the cleat permeability was 28.86 ~ 46.81 md, and the cleat porosity was 0.83 ~ 0.98%. This means that the gas productivity varies significantly with the depth because the reduction of the permeability according to the depth in the coal seam is significant. Therefore, a coalbed depth should be considered essential when designing the spacing of production wells in a coalbed methane reservoir in further study.

A Study on Physical Properties and Catalytic Combustion of Methane of Sr Hexaaluminate Prepared using 1-butanol and Ethylene Glycol (1-butanol과 ethylene glycol을 이용하여 합성한 Sr hexaaluminate의 물리적 특성 및 메탄 연소 반응에 관한 연구)

  • Shon, Jung Min;Woo, Seong Ihl
    • Korean Chemical Engineering Research
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    • v.45 no.3
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    • pp.209-214
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    • 2007
  • Sr hexaaluminate($Sr_{1-x}La_xMnAl_{11}O_{19-\alpha}$) were prepared by sol-gel method of metal alkoxide with 1-butanol or ethylene glycol as a solvent. The physical properties of prepared hexaaluminates were examined by TG/DTA, XRD and $N_2$ adsorption. When ethylene glycol was used as a solvent, the decomposition reaction and dehydroxylation reaction was observed above $400^{\circ}C$ and the temperature of the formation of a crystal structure of hexaaluminate was also increased resulting in small specific surface area and low catalytic activity of methane compared to Sr-hexaaluminate with 1-butanol.

Hydrogen Purification by the Four-Bed Pressure Swing Adsorption Process from Steam Methane Reforming Off-Gas (4탑 PSA 공정의 의한 SMR off-gas로부터 수소 정제)

  • Yang, Se-Il;Park, Ju-Yong;Jang, Seong-Cheol;Kim, Sung-Hyun;Choi, Dae-Ki
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.10a
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    • pp.383-386
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    • 2008
  • The four-bed PSA process using a layered bed of activated carbon and zeolite 5A was studied to produce a high purity hydrogen product from SMR off-gas. At a desired product purity (99.999%+), the recovery increased with decreasing the linear velocity. However, the difference of the increasing of the recovery became smaller with the decreasing of the linear velocity and then was similar from below the linear velocity 3.9 cm/s. When the adsorbents, the feed gas composition, and the operating conditions are given, the residence time is mainly a function for design of the PSA bed size. The minimum residence time exists to obtain the maximum recovery at desired product purity.

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Pressure Swing Adsorption Based Hydrogen Purification Vessel 3D Modeling and Feasibility Study (Pressure Swing Adsorption 기반 수소정제용기 3차원 모델링 및 타당성 검증 연구)

  • CHA, YOHAN;CHOI, JAEYOO;JU, HYUNCHUL
    • Transactions of the Korean hydrogen and new energy society
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    • v.32 no.4
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    • pp.197-204
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    • 2021
  • Pressure swing adsorption is a purification process which can get pure hydrogen. The purification process is composed of four process: compression, adsorption, desorption and discharge. In this study the adsorption process was simulated by using the Fluent and validated with experimental results. A gas used in experiment is composed of H2, CO2, CH4, and CO. Adsorption process conducted under 313 kelvin and 3 bar and bituminous-coal-based (BPL) activated carbon was used as the adsorbent. Langmuir model was applied to explain the gas adsorption. And diffusion of all the gases was controlled by micro-pore resistances. The result shows that, the most adsorbed gas was carbon dioxide, followed by methane and carbon monoxide. And carbon monoxide took the least amount of time to reach the maximum adsorption amount. The molar fraction of the off-gas became the same as the molar fraction of the gas supplied from the inlet after adsorption reached the equilibrium.

Adsorption Properties of Ca-exchanged Clinoptilolite under Low-temperature (Ca 이온교환 Clinoptilolite의 저온 흡착 특성)

  • Song Taek-Yong;Lee Young-Chul;Baek Young-Soon;Kim Jong-Nam
    • Journal of the Korean Institute of Gas
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    • v.8 no.4 s.25
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    • pp.36-41
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    • 2004
  • The breakthrough curve was obtained to evaluate separation efficiency of clinoptilolite as an methane/nitrogen separation adsorbent. The Ca-exchanged clinoptilolite showed improved separation efficiency. The nitrogen adsorption capacity of Ca-clinoptilolite was increased with decreasing temperature. The temperature was decreased from 293K to 253K(feed gas flow rate : 670ml/min, pressure : 333kPa). The adsorption capacity is increased with increasing pressure. The pressure was increased from 333kPa to 700kPa(feed gas flow rate : 670ml/min, temperature : 253K, 293K).

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Separation of $CH_4/CO_2/N_2$ Mixture by Pressure Swing Adsorption (PSA법을 이용하여 $CH_4/CO_2/N_2$ 혼합가스 중에서 메탄의 분리)

  • Cho, Woo-Ram;Jeong, Gu-Hyun;Shin, Young-Hwan;Yoo, Hee-Chan;Na, Byung-Ki
    • Clean Technology
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    • v.17 no.4
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    • pp.389-394
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    • 2011
  • A compact adsorption-based process for removal of carbon dioxide and nitrogen from natural gas has been discussed. Among the adsorption-based processes, especially, the pressure swing adsorption (PSA) process has been a suitable unit operation for the purification and separation of gas because of low operation energy and cost. A step cycle is made up of pressurization, feed, equalization, blowdown and rinse. In this work, the PSA process is composed of zeolite 13X and carbon molecular sieve (CMS) for removal of carbon dioxide and nitrogen from mixed gas containing $CH_4/CO_2/N_2$ (75:21:4 vol%). A CMS selectively removes carbon dioxide and a zeolite 13X separates nitrogen from methane. CMS is investigated experimentally due to the high throughput of the faster diffusing component ($CO_2$). The gas composition of top, bottom and feed tank was measured with the gas chromatography (GC) using TCD detector, helium as carrier gas and packed column for analysis of methane, carbon dioxide, and nitrogen.

Physicochemical properties and methane adsorption performance of activated carbon nanofibers with different types of metal oxides

  • Othman, Faten Ermala Che;Yusof, Norhaniza;Hasbullah, Hasrinah;Jaafar, Juhana;Ismail, Ahmad Fauzi;Nasri, Noor Shawal
    • Carbon letters
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    • v.24
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    • pp.82-89
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    • 2017
  • In this study, composite PAN-based ACNFs embedded with MgO and $MnO_2$ were prepared by the electrospinning method. The resultant pristine ACNFs, ACNF/MgO and $ACNF/MnO_2$ were characterized in terms of their morphological changes, SSA, crystallinity and functional group with FESEM-EDX, the BET method, XRD and FTIR analysis, respectively. Results from this study showed that the SSA of the ACNF/MgO composite ($1893m^2g^{-1}$) is significantly higher than that of the pristine ACNFs and $ACNF/MnO_2$ which is 478 and $430m^2g^{-1}$, respectively. FTIR analysis showed peaks of 476 and $547cm^{-1}$, indicating the presence of MgO and $MnO_2$, respectively. The FESEM micrographs analysis showed a smooth but coarser structure in all the ACNFs. Meanwhile, the ACNF/MgO has the smallest fiber diameter ($314.38{\pm}62.42nm$) compared to other ACNFs. The presence of MgO and $MnO_2$ inside the ACNFs was also confirmed with EDX analysis as well as XRD. The adsorption capacities of each ACNF toward $CH_4$ were tested with the volumetric adsorption method in which the ACNF/MgO exhibited the highest $CH_4$ adsorption up to $2.39mmol\;g^{-1}$. Meanwhile, all the ACNF samples followed the pseudo-second order kinetic model with a $R^2$ up to 0.9996.

Pure and Binary Mixture Gases Adsorption Equilibria of Hydrogen/Methane/Ethylene on Activated Carbon (활성탄에서의 H2/CH4/C2H4 순수 기체와 이성분 혼합기체의 흡착평형)

  • Jeong, Byung-Man;Kang, Seok-Hyun;Choi, Hyun-Woo;Lee, Chang-Ha;Lee, Byung-Kwon;Choi, Dae-Ki
    • Korean Chemical Engineering Research
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    • v.43 no.3
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    • pp.371-379
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    • 2005
  • Adsorption equilibria of the gases $H_2$, $CH_4$, and $C_2H_4$ and their binary mixtures on activated carbon (Calgon co.) have been measured by static volumetric method in the pressure range of 0 to 18 atm at temperatures of 293.15, 303.15, and 313.15 K. From the parameters obtained from single component adsorption isotherm, multi-component adsorption equilibria could be predicted and compared with experimental data. The binary experimental data were applied to four models : extended Langmuir, extended Langmuir-Freundlich, Ideal Adsorbed Solution theory (IAST), and Vacancy Solution Model (VSM). The models were found to describe the experimental data with a reasonable accuracy. Extended L-F model predicts equilibria of mixture better than any other model.

Catalytic Combustion of Methane over Pd-ZSM-5 Catalysts (Pd-ZSM-5 촉매 상에서 메탄의 연소)

  • Eom, Gi Tai;Park, Jin Woo;Ha, Jai-Mok;Hahm, Hyun Sik
    • Applied Chemistry for Engineering
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    • v.9 no.6
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    • pp.878-883
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    • 1998
  • The methane combustion reaction was conducted over Pb-ZSM-5 catalysts. ZSM-5 synthesized at low temperature and atomospheric pressure was used as a support. The change of methane conversion with $SiO_2/Al_2O_3$ molar ratio was tested. The methane conversions of the synthesized Pb-ZSM-5 catalyst was compared with those of a commercial Pd-ZSM-5(PQ Co.) and $PdO/{\gamma}-Al_2O_3$. The methane conversion increased with the decrease in $SiO_2/Al_2O_3$ molar ratio. The combustion rate of methane also increased with the decrease in $SiO_2/Al_2O_3$ molar ratio. The synthesized Pb-ZSM-5 showed better methane conversion than that of the commercial one. It is found that a crucial factor in methane combustion reaction is oxygen adsorption strength on the catalysts.

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Stabilization of Zeolites Y For Separation by Gas Chromatography (GC분리에 의한 Zeolite Y 안정화)

  • Yim, Going;Heenan, Willian A.
    • The Journal of Natural Sciences
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    • v.8 no.1
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    • pp.41-45
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    • 1995
  • A. partially decationized Y zeolite was pretreated under specific conditions. It was found this calcinated zeolite retains its separation properties for mixtures of the gases hydrogen, nitrogen, oxygen, carbon monoxide, and methane but has much lower affinity for water molecules than untreated, e.g., zeolites A type or X type. The observed effect is discussed on the basis of the results of adsorption measurements on the adsorption capacities, isotherms, and heats of adsorption.

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