• Title, Summary, Keyword: reforming

Search Result 893, Processing Time 0.042 seconds

Life Cycle Assessment for Hydrogen Production Method using Stream Reforming of Naphtha (Naphtha의 stream reforming에 의한 수소제조방법에 대한 전과정평가)

  • Park, Hee-Il;Kim, Ik;Lee, Byung-Kwon;Hur, Tak
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.13 no.1
    • /
    • pp.3-12
    • /
    • 2002
  • In this study, it achieved life cycle assessment to estimate environmental performance for naphtha steam reforming that account for the production over 50% of total hydrogen output. Although hydrogen dosen't emit air emissions, especially, $CO_2$, a large of $CO_2$ is emitted in hydrogen production process. In the result of this study, it ascertained the truth that $CO_2$ is emitted at the rate of $6.3kg/kgH_2$ and that result from steam reforming reaction and use of fossil fuel in hydrogen manufacturing process. Above all, 57% of total $CO_2$ emissions is emitted in process of steam reforming of naphtha and so it knew that the principle of steam reforming is key issue in aspect to environment. Also, it compared hydrogen by fuel of fuel cell vehicle with gasoline fuel of general gasoline vehicle to analyze relative environment of hydrogen for fossil fuel during the life cycle. As the result, it might be difficult in improvement of environment because $CO_2$ emissions during the hydrogen manufacturing process is nearly the same with that during the use of gasoline.

Modeling, Simulation and Optimization of Hydrogen Production Process from Glycerol using Steam Reforming (글리세롤로부터 수증기 개질에 의한 수소 생산공정의 모델링, 시뮬레이션 및 최적화)

  • Park, Jeongpil;Cho, Sunghyun;Lee, Seunghwan;Moon, Dong Ju;Kim, Tae-Ok;Shin, Dongil
    • Korean Chemical Engineering Research
    • /
    • v.52 no.6
    • /
    • pp.727-735
    • /
    • 2014
  • For improved sustainability of the biorefinery industry, biorefinery-byproduct glycerol is being investigated as an alternate source for hydrogen production. This research designs and optimizes a hydrogen-production process for small hydrogen stations using steam reforming of purified glycerol as the main reaction, replacing existing processes relying on steam methane reforming. Modeling, simulation and optimization using a commercial process simulator are performed for the proposed hydrogen production process from glycerol. The mixture of glycerol and steam are used for making syngas in the reforming process. Then hydrogen are produced from carbon monoxide and steam through the water-gas shift reaction. Finally, hydrogen is separated from carbon dioxide using PSA. This study shows higher yield than former U.S. DOE and Linde studies. Economic evaluations are performed for optimal planning of constructing domestic hydrogen energy infrastructure based on the proposed glycerol-based hydrogen station.

Accumulation of the Carbonaceous Species on the Ni/Al2O3 Catalyst during CO2 Reforming of Methane

  • Lee, Jae-Hee;Joo, Oh-Shim;Baek, Young-Soon;Yu, Yong-Ho;Jung, Kwang-Deog
    • Bulletin of the Korean Chemical Society
    • /
    • v.24 no.11
    • /
    • pp.1623-1626
    • /
    • 2003
  • The dependency of the rate of $CO_2$ reforming of methane on the catalyst loading and the reactor size was examined at a fixed temperature of $750\;^{\circ}C$ and a fixed GHSV of 18000 mL(STP)/$g_{cat}.h$. The conversion of methane in $CO_2$reforming decreased with increase in the reactor size. The catalyst was severely deactivated with increase in the catalyst amount. The amount of carbonaceous species combustible below $550\;^{\circ}C$, determined by TPO experiments with the used catalyst samples increased with increase in the catalyst amount, which was again confirmed by XRD and TEM experiments. The increase of the carbonaceous species combustible below $550\;^{\circ}C$ may be due to the suppression of the reverse Boudouard reaction, since the $CO_2$ reforming of methane, a highly endothermic reaction, resulted in lowering the reaction temperature.

CH4 Dry Reforming on Alumina-Supported Nickel Catalyst

  • Joo, Oh-Shim;Jung, Kwang-Deog
    • Bulletin of the Korean Chemical Society
    • /
    • v.23 no.8
    • /
    • pp.1149-1153
    • /
    • 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.

Characteristics of ZrO2 Felt Supported Cu/Zn Catalyst for Methanol Steam Reforming (메탄올 수증기개질을 위한 ZrO2 펠트 기반 Cu/Zn 촉매 특성 연구)

  • CHOI, EUNYEONG
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.28 no.2
    • /
    • pp.129-136
    • /
    • 2017
  • Characteristics of $ZrO_2$ felt supported Cu/Zn catalysts have been investigated for the production of hydrogen via methanol steam reforming. Cu and Zn in different weight percent were loaded using wet impregnation over $ZrO_2$ felt support. The catalysts were characterized with BET and FE-SEM. The performance of these synthesized catalysts were investigated at SCR=1.5, $GHSV=2000h^{-1}$, temperature=$300{\sim}400^{\circ}C$, and pressure=2.5~19.5 barA. The results showed that the $Cu^{32.5}Zn^{7.5}ZrO_2$ catalyst was most active in terms of methanol conversion and hydrogen production. The methanol conversion in steam reforming of methanol was 84.6% at 19.5 barA and furnace $400^{\circ}C$ over $Cu^{32.5}Zn^{7.5}ZrO_2$ catalyst. The catalysts prepared using $ZrO_2$ felt show higher reactor temperature than the pellet type catalyst at same furnace temperature.

Performance Comparison of Integrated Reactor with Steam Reforming and Catalytic Combustion using Anode Off-Gas for High Temperature Fuel Cells (고온용 연료전지 미반응 가스를 이용한 촉매연소-개질 통합 반응기의 성능 비교)

  • Ghang, Tae-Gyu;Sung, Hae-Jung;Lee, Sang-Min;Ahn, Kook-Young;Kim, Yong-Mo
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.22 no.6
    • /
    • pp.800-809
    • /
    • 2011
  • The reaction characteristics of an integrated reactor with steam reformer and catalytic combustor using anode offgas for high temperature fuel cells such as MCFC and SOFC have been experimentally investigated in the present study. The coupled reactor had a coaxial cylindrical shape, and the inner and the outer tube was packed with combustion catalysts and reforming catalysts, respectively. Thus, the endothermic steam reforming could proceed by absorbing heat from catalytic combustion of anode offgas. Results show that increasing inlet temperature and decreasing excess air ratio increased the reformer temperature, which led to the increase in $H_2$ yield. The reforming performance for SOFC conditions was better than that for MCFC conditions since the composition of flammable components became smaller for MCFC cases. Measured reformate composition under various test conditions correlated well with thermal equilibrium composition.

Pt-Ru, Pt-Ni bi-metallic catalysts for heavy hydrocarbon reforming (고 탄화수소 개질을 위한 Pt-Ru, Pt-Ni 이원금속촉매에 관한 연구)

  • Lee, Sanghp;Bae, Joongmyeon
    • 한국신재생에너지학회:학술대회논문집
    • /
    • /
    • pp.97.2-97.2
    • /
    • 2011
  • Pt-Ru and Pt-Ni bimetallic catalysts were prepared and tested for heavy hydrocarbon reforming. Metals were supported on CGO($Ce_{0.8}Gd_{0.2}O_{2.0-x}$) by incipient wetness method. The prepared catalysts were characterized by Temperature programmed reduction(TPR). Oxidative steam reforming of n-dodecane was conducted to compare the activity of the catalysts. The reforming temperature was varied from $500^{\circ}C$ to $800^{\circ}C$ at fixed $O_2$/C of 0.3, $H_2O$/C of 3.0 and GHSV of 5,000/h.Reduction peaks of metal oxide, surface CGO and bulk CGO were detected. Reduction temperature of metal oxide decreased over the bi-metallic catalysts. It is considered that interaction between metals leads to decrease interaction between metal and oxygen. On the other hands, reduction temperatures of surface CGO were dectected in the order of Pt-Ru > Pt-Ni > Pt. low reduction temperatures of surface CGO indicates the low activation energy for oxygen ion conduction to metal. Oxygen ion conduction is known as de-coking mechanism of ionic conducting supports such as CGO. In activity test, fuel conversion was in the same order of Pt-Ru > Pt-Ni > Pt. Especially, 100% of fuel conversion was obtained over Pt-Ru catalysts at $500^{\circ}C$.

  • PDF

Removal of Tar and Soot in The Syngas Produced from Gasification of Wood Chip by Using Catalytic Reformer (촉매 개질기를 이용한 우드칩 가스화 합성가스 내 타르 및 수트 제거)

  • Yoon, Sang-Jun;Son, Young-Il;Kim, Yong-Ku;Lee, Jae-Goo
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.20 no.6
    • /
    • pp.519-525
    • /
    • 2009
  • The catalytic steam reforming of woody biomass tar and soot to convert a synthetic gas containing hydrogen was investigated by using a bench-scale biomass gasification system. One commercial nickel-based catalyst, Katalco 46-6Q, and two different kinds of natural minerals, dolomite and olivine, were tested as a reforming catalyst at various reforming temperatures. The reaction characteristics of woody biomass tar were also investigated by TGA at a variety of heating rates. With all three catalysts conversion efficiency of tar and soot increased at increasing temperature. The reforming of tar and soot in the synthetic gas induce the increase of combustible gases such as $H_2$, CO and $CH_4$ in the product gas. The nickel-based catalyst showed a higher tar and soot conversion efficiency than mineral catalysts under the same temperature conditions.

Methodology for removing unreacted low-hydrocarbons in diesel reformate for stable operation of solid oxide fuel cells (안정적인 SOFC 운전을 위한 디젤 개질기 내 미반응 저탄화수소 제거법)

  • Yoon, Sang-Ho;Bae, Joong-Myeon;Lee, Sang-Ho
    • 한국신재생에너지학회:학술대회논문집
    • /
    • /
    • pp.773-776
    • /
    • 2009
  • In this paper, new concept of the diesel fuel processing is introduced for the stable operation of solid oxide fuel cells (SOFCs). Heavier hydrocarbons than $CH_4$, such as ethylene, ethane, propane, and etc., induce the carbon deposition on anode of SOFCs. In the reformate of heavy hydrocarbons (diesel, gasoline, kerosene, and JP-8), concentration of ethylene is usually higher than low hydrocarbons such as ethane, propane, and butane. So, removal of low hydrocarbons (over C1-hydrocarbons), especially ethylene, at the reformate gases is important for stable operation of SOFCs. New methodology as named "post-reformer" is introduced for removing the low hydrocarbons at the reformate gas stream. Catalyst of the NECS-PR4 is selected for post-reforming catalyst because the catalyst of NECS-PR4 shows the high selectivity for removing low hydrocarbons and achieving the high reforming efficiency. The diesel reformer and post-reformer are continuously operated for about 200 hours as integrated mode. The reforming performance is not degraded and low hydrocarbons in the diesel reformate are completely removed.

  • PDF