• 제목, 요약, 키워드: metal catalyst

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열병합발전소 적용을 위한 Metal foam SCR촉매의 공간속도와 바인더 함량에 따른 NOx 저감에 관한 연구 (A Study on the NOx Reduction According to the Space Velocity Variation and Binder Content of Metal foam SCR Catalyst for Cogeneration Power Plant Application)

  • 나우진;박해경
    • 한국응용과학기술학회지
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    • v.36 no.1
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    • pp.153-164
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    • 2019
  • 본 연구에서는 기존 상용 SCR 촉매보다 비표면적, 경량성 및 온도 응답성이 우수한 SCR 촉매의 개발을 목적으로 바나듐과 텅스텐의 함량과 바인더의 첨가량을 달리하여 Metal foam 형태의 지지체에 코팅하여 SCR 촉매를 제조한 후, 실험실 규모의 마이크로 상압반응기상에서 공간속도별로 NOx 저감 성능을 측정하였다. 촉매의 특성은 Porosimeter, SEM(scanning electron microscope), EDX(energy dispersive x-ray spectrometer) 및 ICP(inductively coupled plasma), 실체현미경(Stereomicroscope) 기기를 이용하여 분석하였다. 연구 결과 NOx 저감 성능은 공간속도가 증가할수록 감소하였고, 바나듐과 텅스텐의 함량이 3.5 wt.% 일 때 가장 우수한 것으로 확인하였다. 또한, 바인더 첨가량이 많을수록 NOx 저감 성능이 감소하는 것으로 나타났는데, 이는 촉매 표면상의 활성점 수가 바인더에 의해 점유되어 감소된 것에 따른 것으로 판단된다. 또한 표면 코팅 상태 분석을 통하여 바인더의 첨가량이 적절히 조절 되어야 함을 알 수 있었다.

Ni와 Co 촉매금속의 표면 거칠기에 따른 그래핀 성장 특성 (Characteristic of Ni and Co metal-catalyst surface roughness in graphene)

  • 김은호;안효섭;장현철;조원주;이완규;정종완
    • 한국전기전자재료학회:학술대회논문집
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    • pp.263-263
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    • 2010
  • High temperature annealing is required to synthesize graphene using CVD. When thin metal catalyst is used for the synthesis, the high temperature pre-annealing makes the thin catalyst highly agglomerated. We investigated the agglomeration effect on the shape of the synthesized graphene. It is found that high temperature annealing makes randomly distributed many hole or blister on metal catalyst, and the synthesized graphene features floral pattern around the hole. The floral patterns of graphene turned out to be multi-layers and higher D peaks in raman spectrum.

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자동차용 폐 삼원촉매로부터의 희귀금속 회수공정 기술 동향 (Recovery of Rare Earth Metal from Used Automotive Three-Way Catalyst)

  • 홍연기
    • 융복합기술연구소 논문집
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    • v.1 no.1
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    • pp.13-17
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    • 2011
  • The car industry is one of the technological applications which more rare earth metals employes as three-way catalysts. Therefore, the recovery of rare earth metals from the used automotive three-way catalysts could be important source to obtain these metals. This work presents the analysis of market and demand for rare earth metal in automotive three-way catalyst and introduces the dry and the wet processes for the recovery of rare earth metals from used three-way catalyst. Finally, the alternative methods to conventional wet processes was simply suggested based on the economic and ecological point of view.

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귀금속 함량에 따른 디젤산화촉매의 이산화질소 배출 특성 (Emission Characteristics of NO2 in Diesel Oxidation Catalyst according to the Content of Precious Metal)

  • 김훈명;박용성;이광구
    • 한국연소학회:학술대회논문집
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    • pp.37-38
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    • 2012
  • Two catalyst systems with different content of precious metal coated on DOC are carefully tested in a diesel engine to investigate the emission characteristics of $NO_2$. Three types of experiment methods ($NO_2$ conversion test, ETC mode test, and BPT test) are applied to compare the performance of the two catalyst systems. All the experimental results consistently indicate that it is possible to satisfy $NO_x$ regulation by properly lowering the content of precious metal without the loss of PM removal performance.

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Transition Metal-Mediated Living Radical Polymerization toward Precision Functional Polymers via Catalyst Design

  • Sawamoto, Mitsuo;Ouchi, Makoto
    • 한국고분자학회:학술대회논문집
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    • pp.93-94
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    • 2006
  • This lecture will present an overview of recent advances in our transition metal-mediated living radical polymerization, particularly focused on catalyst design and precision synthesis of functional polymers. Selected topics will include: (A) Design of Transition Metal Complexes: Evolution of Catalysts (B) New Ruthenium and Iron Catalysts: Active and Versatile (C) Functional Methacrylates for Advanced Functional Polymers (D) Functional Star Polymers: Microgel Cores for Metal Catalysts.

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Effect of Catalyst Preparation on the Selective Hydrogenation of Biphenol over Pd/C Catalysts

  • Cho, Hong-Baek;Park, Jai-Hyun;Hong, Bum-Eui;Park, Yeung-Ho
    • Bulletin of the Korean Chemical Society
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    • v.29 no.2
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    • pp.328-334
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    • 2008
  • The effects of catalyst preparation on the reaction route and the mechanism of biphenol (BP) hydrogenation, which consists of a long series-reaction, were studied. Pd/C catalysts were prepared by incipient wetness method and precipitation and deposition method. The reaction behaviors of the prepared catalysts and a commercial catalyst along with the final product distributions were very different. The choice of the catalyst preparation conditions during precipitation and deposition including the temperature, pH, precursor addition rate, and reducing agent also had significant effects. The reaction behaviors of the catalysts were interpreted in terms of catalyst particle size, metal distribution, and support acidities.

Oxidation of Ethylbenzene Using Nickel Oxide Supported Metal Organic Framework Catalyst

  • Peng, Mei Mei;Jeon, Ung Jin;Ganesh, Mani;Aziz, Abidov;Vinodh, Rajangam;Palanichamy, Muthiahpillai;Jang, Hyun Tae
    • Bulletin of the Korean Chemical Society
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    • v.35 no.11
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    • pp.3213-3218
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    • 2014
  • A metal organic framework-supported Nickel nanoparticle (Ni-MOF-5) was successfully synthesized using a simple impregnation method. The obtained solid acid catalyst was characterized by Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption-desorption and thermogravimetric analysis (TGA). The catalyst was highly crystalline with good thermodynamic stability (up to $400^{\circ}C$) and high surface area ($699m^2g^{-1}$). The catalyst was studied for the oxidation of ethyl benzene, and the results were monitored via gas chromatography (GC) and found that the Ni-MOF-5 catalyst was highly effective for ethyl benzene oxidation. The conversion of ethyl benzene and the selectivity for acetophenone were 55.3% and 90.2%, respectively.

Modification of Thermal Degradation of Oligo(methylsilene) Catalyzed by Group 4 and 6 Transition Metal Complexes

  • 우희권;양수연;황택성;김동표
    • Bulletin of the Korean Chemical Society
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    • v.19 no.12
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    • pp.1310-1314
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    • 1998
  • The oligo(methylsilene) (1) was treated with the group 4 metallocene Cp2MCl2/Red-Al (M = Ti, Zr, Hf) combination catalysts and with the group 6 metal carbonyl M(CO)6 (M = Cr, W) catalysts, producing the modified, cross-linked polymers. The average molecular weights and percent ceramic residue yields of modified polymers increase as the catalyst goes down from Ti to Hf and similarly as the catalyst goes down from Cr to W. An interrelationship between average molecular weights and percent ceramic residue yield is found within the respective group of catalysts, but is not observed as the catalyst goes down from Ti to W. The polymers modified with the group 4 metallocene combination catalysts have higher molecular weights and similar percent ceramic residue yields as compared to the polymers modified with the group 6 metal carbonyl catalysts. The catalytic activities of group 4 metallocene combinations appear to be higher -100 ℃, but to be lower at very high temperature than those of group 6 metal carbonyls.

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금속 산화물 반도체 나노구조의 합성과 가스 감응 특성 (Synthesis of Metal Oxide Semiconductor Nanostructures and Their Gas Sensing Properties)

  • 최권일;이종흔
    • 한국전기전자재료학회논문지
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    • v.25 no.8
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    • pp.632-638
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    • 2012
  • The prepartion of various metal oxide nanostructures via hydrothermal method, hydrolysis, thermal evaporation and electrospinning and their applications to chemoresistive sensors have been investigated. Hierarchical and hollow nanostructures prepared by hydrothermal method and hydrolysis showed the high response and fast responding kinetics on account of their high gas accessibility. Thermal evaporation and electrospinning provide the facile routes to prepare catalyst-loaded oxide nanowires and nanofibers, respectively. The loading of noble metal and metal oxide catalyst were effective to achieve rapid response/recovery and selective gas detection.

Ni계 촉매상에서 가솔린의 자열 개질반응에 (Autothermal Reforming)의한 수소제조 및 응용 (Hydrogen Production by Autothermal Reforming Reaction of Gasoline over Ni-based Catalysts and it Applications)

  • 문동주;류종우;유계상;이병권
    • 한국수소및신에너지학회논문집
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    • v.15 no.4
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    • pp.274-282
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    • 2004
  • This study focused on the development of high performance catalyst for autothermal reforming (ATR) of gasoline to produce hydrogen. The ATR was carried out over MgO/Al2O3 supported metal catalysts prepared under various experimental conditions. The catalysts before and after reaction were characterized by N2-physisorption, CO-chemisorption, SEM and XRD. The performance of supported multi-metal catalysts were better than that of supported mono-metal catalysts. Especially, it was observed that the conversion of iso-octane over prepared Ni/Fe/MgO/Al2O3 catalyst was 99.9 % comparable with commercial catalyst (ICI) and the selectivity of hydrogen over the prepared catalyst was 65% higher than ICI catalyst. Furthermore, it was identified that the sulfur tolerance of prepared catalyst was much better than ICI catalyst based on the ATR reaction of iso-octane containing sulfur of 100 ppm. Therefore, Ni/Fe/MgO/Al2O3 catalyst can be applied for a fuel reformer, hydrogen station and on-board reformer in furl cell powered vehicles.