• Title/Summary/Keyword: Rh/Al_2O_3

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Catalytic combustion of methane over bi and tri noble metallic alumina catalysts (이원 및 삼원 귀금속 알루미나 촉매를 이용한 메탄의 촉매 산화)

  • Jang, Hyun-Tae;Lee, Ji-Yun;Bhagiyalakshmi, Margandan;Cha, Wang-Seong
    • Proceedings of the KAIS Fall Conference
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    • 2009.05a
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    • pp.894-897
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    • 2009
  • $\gamma-Al_2O_3$, $TiO_2$, ZrO에 Pt, Pd, Rh, Ru의 귀금속촉매를 분산하였으며, 촉매 분산은 과잉용액함침법으로 제조하였다. 저온에서 높은 산화능을 지닌 최소화된 귀금속의 함침량을 도출하기 위하여 연구를 수행하였다. 귀금속 촉매의 조성에 대한 영향을 도출하기 위하여 Rh, Pt, Pd, Ru에 대하여 조성과 함침량에 대하여 연구를 수행하였다. 충전층 반응기 및 모노리스 반응기를 이용한 촉매산화반응 실험결과 50% 전환온도 및 90% 전환온도를 측정한 결과 최적의 조성은 Pt-Rh /$Al_2O_3$ 촉매로 판명되었다.

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Partial Oxidation of n-Octane over Rh-Containing Alumina-Supported Catalysts (알루미나에 담지된 Rh 함유 촉매의 n-옥탄 부분산화반응)

  • Lee, Shin-Hwa;Suh, Young-Woong;Suh, Dong-Jin;Park, Tae-Jin;Lee, Kwan-Young
    • Journal of Hydrogen and New Energy
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    • v.19 no.1
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    • pp.10-17
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    • 2008
  • This study has been focused on the partial oxidation(POX) of n-octane over Rh-containing catalysts supported on alumina. The catalysts for this reaction were prepared by incipient wetness(IW) and co-gel(CG) methods, followed by the calcination at $900{\circ}C$ or $1,200{\circ}C$. When applied to the POX of n-octane carried out at $600{\circ}C$ with C/O=3 and GHSV=3,450/h, the catalyst prepared by the CG method and calcined at $1,200{\circ}C$ showed the best activity, yielding 42% syngas($H_2$+CO) with the $H_2$/CO ratio of $2{\sim}2.4$. To enhance the activity and stability of catalysts, bimetallic catalysts were synthesized by the CG method. As a result, the performance of Rh-Ni/$Al_2O_3$ catalyst was superior to that of Rh/$Al_2O_3$ catalyst in terms of the catalyst stability, due to the retarding effect on the Rh-to-$Rh_2O_3$ transition by the addition of Ni. This result was confirmed by XRD, TEM, and TPR characterizations.

Hydrogenolysis of CFC-113a$(CF_3CCl_3)$ Catalyzed by Heterogeneous Catalysts in the Liquid Phase (불균일 촉매를 이용한 CFC-113a$(CF_3CCl_3)$의 액상 가수소 분해 반응)

  • Jo, Uk Jae;Lee, Ik Mo;Kim, Hong Gon;Kim, Hun Sik
    • Journal of the Korean Chemical Society
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    • v.38 no.9
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    • pp.695-700
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    • 1994
  • Hydrogenolysis reactions of CFC-113a catalyzed by various heterogeneous catalysts $(Rh/Al_2O_3,\;Pd/C,\;Ni,\;Al_2O_3,\;Active\;carbon)$ were investigated in the liquid and gas phases. In the liquid phase reaction, different catalysts showed different activities, but all catalysts used gave high selectivities toward HCFC-123 over 95%. It was noticeable that the neutral $Al_2O_3$ showed both a high activity and a selectivity in the liquid phase reaction. In the gas phase reaction, transition metals on carbon(Pd/C, Pt/C) were so active for hydrogenolysis of CFC-113a that they even catalyzed the production reaction of overhydrogenated compounds such as $HCFC-133a(CF_3CH_2Cl)\;and\;HFC-143a(CF_3CH_3)$. $Al_2O_3$, which showed the high activity in the liquid phase reaction, did not show a remarkable activity. When $Al_2O_3$ was used in the liquid phase reaction, the hydrogenolysis of CFC-113a proceeded without any side products in THF. However, the same reaction in MeOH produced side products, such as $CH_3OCH_3\;and\;CH_3CH_2OCH_3$ from solvent. Based on this result, including heterogeneous catalysts, it was concluded that the solvent played an important role in the liquid phase reaction.

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Removal of Rhodamine Dye from Water Using Erbium Oxide Nanoparticles

  • Luaibi, Hasan M.;Al-Taweel, Saja S.;Gaaz, Tayser Sumer;Kadhum, Abdul Amir H.;Takriff, Mohd S.;Al-Amiery, Ahmed A.
    • Korean Journal of Materials Research
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    • v.29 no.12
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    • pp.747-752
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    • 2019
  • Environmental pollution remains a considerable health risk source all over the world; however, hazards are usually higher in developing countries. Iraq has long been suffering from the problem of pollution and how to treat pollution. Photocatalytic degradation has turned out to be most productive process for dye degradation. In this investigation, Rhodamine B (RhB), dye has been selected for degradation under visible light illumination. To address this issue, we fabricate erbium trioxide nanoparticles (Er2O3/NPs). Erbium trioxide nanoparticles are prepared and utilized for photo-catalytic degradation. The characterization of Er2O3/NPs is described and confirmed by utilizing of XRD (X-ray diffraction) and SEM (Scanning Electron Microscopy). The average size of Er2O3 nanoparticles is observed to be 16.00 nm. Er2O3/NPs is investigated for its ability of photo-catalytic degradation through certain selected parameters such as concentration and time. The methodological results show that the synthesized Er2O3/NPs is a good photo-catalytic for Rhodamine degradation.

Humidity Sensing Characteristics of TiO2 Thin Films Fabricated by R.F.Sputtering Method (R.F.스퍼터링법에 의해 제작된 TiO2 박막의 습도감지특성)

  • You, Do-Hyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.7
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    • pp.974-979
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    • 2013
  • $TiO_2$ thin films are fabricated using R.F.sputtering method. $TiO_2$ thin films are coated on $Al_2O_3$ substrate printed IDE(interdigitated electrode). Impedance of thin films decreases according to increase relative humidity and it increases according to decrease measuring frequency. When substrate temperature is room temperature, impedance of thin films is from 45.68[MHz] to 37.76[MHz] within the limits from 30[%RH] to 75[%RH] at 1[kHz]. Whereas when substrate temperature is 100[$^{\circ}C$], impedance of thin films is from 692[kHz] to 539[kHz] within the limits from 30[%RH] to 75[%RH] at 1[kHz]. Impedance variation of thin films is bigger in low frequency regions than in high frequency regions. When substrate temperature is 100[$^{\circ}C$], impedance of thin films is lower than that of room temperature.

Characteristics of Formaldehyde and N2O Formation from the Catalytic Reaction of Methane (메탄의 촉매반응에 의한 포름알데히드 및 N2O의 생성특성)

  • Choi, B.C.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.2
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    • pp.95-101
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    • 1995
  • Experiments have been conducted to investigate the characteristics of formaldehyde and nitrous oxide formation from the catalytic reaction of methane. Catalysts used in the experiment were Pd. Pd/Pt/Rh loaded on ${\gamma}-Al_2O_3$ and ${\gamma}-Al_2O_3-La_2O_3$ monolith. In the catalytic reaction of methane. as the concentration of NO, $O_2$ and $CH_4$ increased, the formaldehyde emission was increased. The concentration of $N_2O$ increased as NO and CO increased. It was also found that the formaldehyde emission was produced by the gas reaction of methane in high temperature above 950K.

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Atmospheric chemistry and characteristics of HCHO, $CH_3CHO$ during intensive measurement for Development of Ozone Forecasting System for Seoul (서울시에 맞는 오존 예보 시스템 개발을 위한 집중 측정 시기의 알데하이드 화합물의 특성 및 대기화학)

  • 홍상범;정용국;이종민;이재훈
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • 2000.11a
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    • pp.37-39
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    • 2000
  • 오존에 대한 예보 모델을 연구하는 데는 오존의 생성과 소멸에 관한 광 화학 반응에 대한 이해가 중요한 데 대류권에서 일어나는 알짜 오존 생성(net ozone production)반응은 다음과 같다. (R1) $HO_2$.+NO$\longrightarrow$$NO_2$+OH. (R2) $RO_2$.+NO$\longrightarrow$$NO_2$+RO. (R3) $NO_2$+hu(424< nm) $\longrightarrow$NO+O($^{3}P$) (R4) O($^{3}P$)+$O_2$+M$\longrightarrow$$O_3$+M이때 (R1)과 (R2) 반응에 참여하는 $HO_2$.라디칼 / $RO_2$.라디칼은 주로 대기 중에 존재하는 탄화수소(RH)와 OH.의 반응에 의하여 직접 생성되기도 하고, 이때 생성된 알데하이드(RCHO) 화합물이 OH.과의 반응과 광분해 반응을 통해서 형성된다. 한편, 대도시 지역의 경우 자동차의 배기가스가 알데하이드 화합물의 주요 인위적인 배출원으로 알려져 있다(Viskari et al., 2000, Granby et al., 1997). (중략)

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Studies on Reforming Gas Assisted Regeneration of Multi-channel Catalyzed DPF (합성가스(Reforming gas)를 이용한 멀티채널 CDPF의 재생 특성 연구)

  • Choi, Kwang-Chun;Chung, Jin-Hwa;Song, Soon-Ho;Chun, Kwang-Min
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.3
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    • pp.138-145
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    • 2011
  • Diesel particulate filter (DPF) systems are being used to reduce the particulate matter emission of diesel vehicles. The DPF should be regenerated after certain driving hours or distance to eliminate soot in the filter. The most widely used method is active regeneration with oxygen at $550{\sim}650^{\circ}C$. Syngas (synthetic gas) can be used to lower the regeneration temperature of Catalyzed DPF (CDPF). The syngas is formed by fuel reforming process of CPOx (Catalytic Partial Oxidation) at specific engine condition (1500rpm, 2bar) using 1wt.% $Rh/CeO_2-ZrO_2$ catalyst. The oxidation characteristics of PM with syngas supplied to filter were studied using partial flow system that can control temperature and flow rate independently. The filter is coated with washcoat loading of $25g/ft^3$ $Pt/Al_2O_3-CeO_2$, and multi-channel CDPF (MC-CDPF) was used. The filter regeneration experiments were performed to investigate the effect of syngas exothermic reaction on soot oxidation in the filter. For this purpose, before oxidation experiment, PM was collected about 8g/L to the filter at engine condition of 1500rpm, bmep 8bar and flow temperature of $200^{\circ}C$ Various conditions of temperature and concentration of syngas were used for the tests. Regeneration of filter started at 2% $H_2$ and CO concentration respectively and inlet temperature of $260^{\circ}C$. Filter Regeneration occurs more actively as the syngas concentration becomes higher.

Study of the Optimal Calcination Temperature of an Al/Co/Ni Mixed Metal Oxide as a DeNOx Catalyst for LNT

  • Jang, Kil Nam;Han, Kwang Seon;Hong, Ji Sook;You, Young-Woo;Suh, Jeong Kwon;Hwang, Taek Sung
    • Clean Technology
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    • v.21 no.3
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    • pp.184-190
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    • 2015
  • Most of LNT catalysts use noble metals such as Pt for low temperature NOx oxidation but there is an economic weakness. For the purpose of overcoming this, this study is to develop DeNOx catalyst for LNT excluding PGM (platinum group metal) such as Pt, Pd, Rh, etc. To do so, Al/Co/Ni catalyst selected as a preliminary test is used to study fundamental property and NOx’s conversion according to calcined temperature. Ultimately, that is, Al/Co/Ni mixed metal oxide which does not use PGM is selected and physicochemical characterization is performed by way of XRD, EDS, SEM, BET and ramp test and NOx conversion is also analyzed. This study shows that all samples consist of mixed oxides of spinel structure of Co2AlO4 and NiAl2O4 and have enough pore volume and size for redox. But as a result of NH3-TPD test, it is desired that calcined temperature needs to be maintained at 700 ℃ or lower. Also only samples which are processed under 500 ℃ satisfied NO and NOx conversion simultaneously through ramp test. Based on this study’s results, optimum calcined temperature for Al/Co/Ni=1.0/2.5/0.3 mixed metal oxide catalyst is 500 ℃.

Effect of CeO2 Addition on De-CH4 and NOx Performance (CH4와 NOx 저감 성능에 관한 CeO2 첨가의 영향)

  • Seo, Choong-Kil
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.9
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    • pp.473-479
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    • 2017
  • Due to environmental pollution, hazards of the human body, and global warning, changes in the power train of automobiles are intensifying, and the market forelectronic vehicles is rising. Also, in order to meet the stricter emission regulations forautomobiles with internal combustion engines based on fossil fuel, the proportion of after-treatments for vehicles and vessels is increasing gradually. The objective of this study is to investigate the effectsfrom additive ceric oxide ($CeO_2$) loading amounts to improve the methane ($CH_4$) and nitric oxide (NOx) abatement ability of the natural gas oxidation catalysts(NGOC) reducing toxic gases emitted from compressed natural gas (CNG) buses. Three kinds of NGOC were prepared under the following conditions: fresh and $700^{\circ}C$ for 12hr thermal aging, and the reduction performance of toxic gases was evaluated. Fresh $1Pt-3Pd-1Rh-3MgO-6CeO_2/(Al+Z)$ NGOC containing 6wt% $CeO_2$ had the highest dispersivity of palladium (Pd) with high selectivity to $CH_4$ and improved harmful gas reduction performance. The NGOC with 6wt% $CeO_2$ loaded the least decreased in the dispersivity of the noble metal, and showed the highest reduction of harmful gases due to the thermal durability of $CeO_2$.