• Title/Summary/Keyword: hydrogen separation membrane

Search Result 150, Processing Time 0.02 seconds

Evaluating the Efficacy of Commercial Polysulfone Hollow Fiber Membranes for Separating H2 from H2/CO Gas Mixtures (상용 폴리설폰 중공사막의 수소/일산화탄소 혼합가스 분리 성능 평가)

  • Do Hyoung Kang;Kwanho Jeong;Yudam Jeong;Seung Hyun Song;Seunghee Lee;Sang Yong Nam;Jae-Kyung Jang;Euntae Yang
    • Membrane Journal
    • /
    • v.33 no.6
    • /
    • pp.352-361
    • /
    • 2023
  • Steam methane reforming is currently the most widely used technology for producing hydrogen, a clean fuel. Hydrogen produced by steam methane reforming contains impurities such as carbon monoxide, and it is essential to undergo an appropriate post-purification step for commercial usage, such as fuel cells. Recently, membrane separation technology has been gaining great attention as an effective purification method; in this study, we evaluated the feasibility of using commercial polysulfone membranes for biogas upgrading to separate and recover hydrogen from a hydrogen/carbon monoxide gas mixture. Initially, we examined the physicochemical properties of the commercial membrane used. We then conducted performance evaluations of the commercial membrane module under various conditions using mixed gas, considering factors such as stage-cut and operating pressure. Finally, based on the evaluation results, we carried out simulations for process design. The maximum H2 permeability and H2/CO separation factor for the commercial membrane process were recorded at 361 GPU and 20.6, respectively. Additionally, the CO removal efficiency reached up to 94%, and the produced hydrogen concentration achieved a maximum of 99.1%.

Hydrogen separation of $V_{99.8}B_{0.2}$ Alloy Membrane in Water-gas shift Reaction (수성 가스 전이반응에서 $V_{99.8}B_{0.2}$ 합금 분리막의 수소분리)

  • Jeon, Sung-Il;Jung, Yeong-Min;Park, Jung-Hoon;Lee, Yong-Taek
    • Membrane Journal
    • /
    • v.22 no.1
    • /
    • pp.16-22
    • /
    • 2012
  • The influence of co-existing gases on the hydrogen permeation without sweep gas was studied through a Pd-coated $V_{99.8}B_{0.2}$ alloy membrane. Membranes have been investigated in the pressure range 1.5-8.0 bar under pure hydrogen, hydrogen-carbon dioxide and hydrogen-carbon monoxide gas mixture without sweep gas at $400^{\circ}C$. Preliminary hydrogen permeation experiments without sweep gas have been confirmed that hydrogen flux was $40.7mL/min/cm^2$ for a Pd-coated $V_{99.8}B_{0.2}$ alloy membrane (thick : 0.5 mm) using pure hydrogen as the feed gas. In addition, hydrogen flux was $21.4mL/min/cm^2$ for $V_{99.8}B_{0.2}$ alloy membrane using $H_2/CO_2$ as the feed gas. The hydrogen permeation flux decreased with decrease of hydrogen partial pressure irrespective of pressure when $H_2/CO_2$and $H_2/CO$mixture applied as feed gas respectively and permeation fluxes were satisfied with Sievert's law in different feed conditions. It was found from XRD, SEM/EDX results after permeation test that the Pd-coated $V_{99.8}B_{0.2}$ alloy membrane had good stability and durability for various mixtures feeding condition.

A Study of the Formation of Binary Intermediate Layer on Pd-based Hydrogen Separation Membrane Using Various Types of Metal Oxides (다양한 형태의 금속 산화물을 이용한 Pd계 복합 수소분리막의 2원계 중간층 형성에 관한 연구)

  • Hwang, In-Hyuck;Kim, Sung Su
    • Applied Chemistry for Engineering
    • /
    • v.29 no.2
    • /
    • pp.196-200
    • /
    • 2018
  • In this study, the intermediate layer in Pd-based hydrogen separation membrane was synthesized to minimize the surface roughness and defects using powder-type and sol-type metal oxides. The surface properties and gas permeation characteristics were analysed by SEM and $N_2$ gas permeation test. The coating layer composed of sol type metal oxides has smooth surface, especially the layer coated by $TiO_2$ sol has little pin holes, cracks and defects. The binary layer composed of powder type and sol type metal oxides has similar flux characteristics to a single sol type layer. The Pd-based composite membrane improved by the binary intermediate layer exhibited $0.32mol/m^2s$ of the hydrogen permeation flux with a selectivity ($H_2/N_2$) of ~10,890 at 672 K and a pressure difference of 1 bar.

Water Gas Shift Reaction in Palladium/Ceramic Membrane Reactor (팔라듐/세라믹 막반응기를 이용한 수성가스전환반응)

  • Choi, Tae-Ho;So, Won-Wook;Kim, Kwang-Je;Moon, Sang-Jin;Hyung, Gi-Woo;Chough, Sung Hyo
    • Applied Chemistry for Engineering
    • /
    • v.16 no.2
    • /
    • pp.282-287
    • /
    • 2005
  • Palladium membranes, which are permselective to hydrogen separation, were used for the hydrogen purification and in membrane reactors for improving conversions by shifting the reaction equilibrium. Palladium/ceramic composite membranes were prepared by electroless plating technique and then etched in titanium chloride ($TiCl_4$) as a post treatment to enhance the membrane's durability. These membranes were used for membrane reactors in water gas shift (WGS) reaction. CO conversions for the membrane reactor were obtained according to experimental parameters and compared to the traditional reactor without a palladium/ceramic membrane. As a result, CO conversion using palladium membrane reactor at an appropriate condition was over 20~25% greater than that without the membrane reactor. The stability in the long-term test of up to 120 h for WGS reaction with the membrane reactor was good without the degredation of CO conversion.

Determination of Trace Anions in Concentrated Hydrogen Peroxide by Direct Injection Ion Chromatography with Conductivity Detection after Pt-Catalyzed On-Line Decomposition

  • 김도희;이보경;이동수
    • Bulletin of the Korean Chemical Society
    • /
    • v.20 no.6
    • /
    • pp.696-700
    • /
    • 1999
  • A method has been developed for the determination of trace anion impurities in concentrated hydrogen peroxide. The method involves on-line decomposition of hydrogen peroxide, ion chromatographic separation and subsequent suppressed-type conductivity detection. H2O2 is decomposed in Pt-catalyst filled Gore-Tex membrane tubing and the resulting aqueous solution containing analytes is introduced to the injection valve of an ion chromatograph for periodic determinations. The oxygen gas evolving within the membrane tubing escapes freely through the membrane wall causing no problem in ion chromatographic analysis. Decomposition efficiency is above 99.99% at a flow rate of 0.4mL/min for a 30% hydrogen peroxide concentration. Analytes are quantitatively retained. The analysis results for several brands of commercial hydrogen peroxides are reported.

Resourcing of Methane in the Biogas Using Membrane Process (분리막을 이용한 바이오가스의 메탄 자원화)

  • Park, Young G.;Yang, Youngsun
    • Clean Technology
    • /
    • v.20 no.4
    • /
    • pp.406-414
    • /
    • 2014
  • Biogas is a gaseous mixture produced from microbial digestion of organic materials in the absence of oxygen. Raw biogas, depending upon organic materials, digestion time and process conditions, contains about 45-75% methane, 30-50% carbon dioxide, 0.3% of hydrogen sulfide gas and fraction of water vapor. To achieve the standard composition of the biogas the treatment techniques like absorption or membrane separation was performed for the resourcing of biogas. In this paper the experimental results of the methane purification in simulated biogas mixture consisted of methane, carbon dioxide and hydrogen sulfide were presented. The composite membrane is manufactured within polysulfone in order to increase the separation performances for the gaseous mixtures of $CO_2$ and $CH_4$ which are main components of the biogas. The effects of feed pressures and mixed gas on the separation of $CO_2-CH_4$ by membrane are investigated. Chelate chemical was utilized to treat the purification of methane from the $H_2S$ concentration of 0.3%.

Preparation of Pd/Al2O3, Pd/Ag/Al2O3 Membranes and Evaluation of Hydrogen Permeation Performance (Pd/Al2O3, Pd/Ag/Al2O3 분리막의 제조와 수소 투과 성능 평가)

  • Lee, Jeong In;Shin, Min Chang;Zhuang, Xuelong;Hwang, Jae Yeon;Kim, Eok yong;Jeong, Chang-Hun;Park, Jung Hoon
    • Membrane Journal
    • /
    • v.32 no.2
    • /
    • pp.116-125
    • /
    • 2022
  • In this experiment, an α-Al2O3 ceramic hollow fiber was used as a support, and a hydrogen membrane plated with Pd and Pd-Ag was manufactured through electroless plating. The Pd-Ag membrane was annealed at 500℃ for 10 h to form an alloy of Pd and Ag. It was confirmed that it became a Pd-Ag alloy through EDS (Energy Dispersive X-ray Spectroscopy) analysis. Also, the thickness of the Pd, Pd-Ag plating layer was measured to be about 8.98 and 9.29 ㎛ through SEM (Scanning Electron Microscope) analysis respectively. Hydrogen permeation experiment was performed using the H2 gas and mixed gas (H2 and N2) in the range of 350~450℃ and 1-4 bar using the prepared hydrogen membrane. Under the H2 gas condition, the Pd and Pd-Ag membrane has a flux of up to 21.85 and 13.76 mL/cm2·min and also separation factors of 1216 and 361 were obtained in the mixed gas at 450℃ and 4 bar conditions respectively.

Electrochemical Characteristics of Electrolyte Membrane for Hydrogen Production in High Temperature Electrolysis (고온 수증기 전해 수소제조를 위한 전해질 막의 전기화학적 특성 고찰)

  • Choi Ho-Sang;Son Hyo-Seok;Sim Kyu-Sung;Hwang Gab-Jin
    • Membrane Journal
    • /
    • v.15 no.4
    • /
    • pp.349-354
    • /
    • 2005
  • YSZ (yttria-stabilized zirconia) determined with an electrolyte that analyzed thermal stability along sintering condition and an electric characteristic. As sintering temperature increases by SEM, grain grows and it showed that pore decreases relatively. and confirmed effect by grain size. It evaluated that particle internal resistance and electric performance by resistance in an electrolyte and electricity conductivity measurement through ac impedance measurement in temperature of $800\~1000^{\circ}C$ in 2-probe method In order to recognize an electric characteristic. In dry process and wet process, density was each 6.13, 6.25 $g/cm^3$ and the relative density was each 98, 99$\%$ when sintering condition is $1400^{\circ}C$.

Analysis of a Hydrogen Generation Membrane Reactor (수소 생산용 막반응기의 해석)

  • Kim Hyung Gyu;Suh Jung Chul;Baek Young Soon
    • Journal of the Korean Institute of Gas
    • /
    • v.8 no.3 s.24
    • /
    • pp.16-23
    • /
    • 2004
  • A membrane reactor concept, which combines the typical characteristics of chemical reaction with separation process, has been analyzed and simulated in this study. The advantages of the use of a membrane reactor include chemical equilibrium shift towards higher reactant conversion and purer product than the traditional reactors. A membrane reactor model which incorporates a catalytic reaction zone and a separation membrane is proposed. The water-gas shift reaction to produce hydrogen was chosen as a model reaction to be investigated. The membrane reactor is divided into smaller parts by number of n and each part (named cell), which contains both reaction and product separation function is modeled. One of the membrane outlet streams is connected to the next cell, which is repeated up to the last cell. The simulation results can be used for various purposes including decision of optimum operating condition and membrane reactor design.

  • PDF

Application of Membrane Technology in Thermochemical Hydrogen Production IS (iodine-sulfur) Process Using the Nuclear Heat (원자력 고온 핵 열을 이용한 열화학적 수소제조 IS(요오드-황) 프로세스에서의 분리막 기술의 이용)

  • Hwang Gab-Jin;Park Chu-Sik;Lee Sang-Ho;Kim Tae-Hwan;Choi Ho-Sang
    • Membrane Journal
    • /
    • v.14 no.3
    • /
    • pp.185-191
    • /
    • 2004
  • It summarized about the properties of thermochemical water-splitting iodine-sulfur process that was hydrogen production using the waste heat from the High Temperature Gas-Cooled Reactor (HTGR) recycling the heat of nuclear power. It was mainly explained about the application of membrane separation technique in IS process. Thermochemical water-splitting hydrogen production method using the high temperature nuclear thermal energy could be realized and remained to be solved the investigation subject. And, it is possible for mass-production of hydrogen such as one of the clean energy in future.