• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.156.2-156.2
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• 2011

본 연구에서는 일단 수성가스전이반응 (Single stage water gas shift reaction)을 위해 높은 활성을 가진 백금 담지 촉매를 함침법 (Incipient wetness impregnation method)으로 제조하여 높은 공간 속도 (Gas hourly space velocity) $45,515h^{-1}$에서 담체에 따른 촉매 활성을 평가하였다. 담체는 $CeO_2$, $ZrO_2$, MgO, MgO-$Al_2O_3$ (MgO = 30 wt%) 그리고 $Al_2O_3$를 사용하였으며 백금의 담지량은 1 wt%로 고정하였다. BET, XRD, TPR, CO-chemisorption 분석을 통하여 담체의 구조적 특성이 촉매 활성에 미치는 영향에 대하여 조사하였다.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.229.2-229.2
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• 2010

한 단계 수성가스전이반응(Single stage water gas shift reaction)을 위해 높은 산소저장능(OSC: Oxygen Storage Capacity)을 가진 $CeO_2$를 담체로 사용하여 $Pt/CeO_2$ 촉매를 설계하였다. 촉매의 제조 조건은 촉매 활성과 매우 밀접한 관계가 있다. 따라서 $Pt/CeO_2$ 촉매에 제조변수를 다양하게 변화하여 성능을 평가하였다. 촉매 반응 실험은 공간속도(GHSV: Gas Hourly Space Velocity) $45,515h^{-1}$에서 수행하였다. 본 연구에서는 $Pt/CeO_2$ 촉매를 최적화하기 위해 촉매 제조 조건 중 소성온도, 배치 당 제조질량, 전구체 그리고 pH 와 같은 다양한 제조 조건으로 촉매의 성능을 평가하였다.

• Transactions of the Korean hydrogen and new energy society
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• v.23 no.2
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• pp.111-116
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• 2012

Na promoted Pt/$CeO_2$ catalysts with various Na amounts (1, 2, and 3wt%) have been applied to water gas shift reaction (WGS) at a gas hourly space velocity (GHSV) of 45515 $h^{-1}$. 1wt%Pt-2wt%Na/$CeO_2$ catalyst exhibited the highest WGS activity at $240^{\circ}C$ among the catalysts prepared in this study. In addition, 1wt%Pt-2wt%Na/$CeO_2$ catalyst showed relatively stable activity with time on stream. The high activity/stability of 1wt%Pt-2wt%Na/$CeO_2$ catalyst was correlated to its easier reducibility and higher oxygen storage capacity (OSC). As a result, 2wt% Na promoted Pt/$CeO_2$ can be a promising candidate catalyst for the single stage WGS, which requires high intrinsic activity at very high GHSV.

• Transactions of the Korean hydrogen and new energy society
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• v.28 no.4
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• pp.345-351
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• 2017

Single stage water-gas shift reaction has been carried out at a gas hourly space velocity of $150,494h^{-1}$ over $Cu-Ce_{0.8}Zr_{0.2}O_2$ catalysts prepared by a co-precipitation method. Cu loading was optimized to obtain highly active co-precipitated $Cu-Ce_{0.8}Zr_{0.2}O_2$ catalysts for single stage water-gas shift reaction. 80 wt.% $Cu-Ce_{0.8}Zr_{0.2}O_2$ exhibited the excellent catalytic performance as well as 100% $CO_2$ selectivity (CO conversion = 27% at $240^{\circ}C$ for 50 h). The high activity and stability of 80 wt.% $Cu-Ce_{0.8}Zr_{0.2}O_2$ are correlated to low activation energy and large amount of surface Cu atoms.

• Environmental Engineering Research
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• v.23 no.3
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• pp.339-344
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• 2018

The Cu loading of a cubic $Ce_{0.8}Zr_{0.2}O_2$-supported Cu catalyst was optimized for a single-stage water gas shift (WGS) reaction. The catalyst was prepared by a co-precipitation method, and the WGS reaction was performed at a gas hourly space velocity of $150,494h^{-1}$. The results revealed that an 80 wt% $Cu-Ce_{0.8}Zr_{0.2}O_2$ catalyst exhibits excellent catalytic performance and 100% $CO_2$ selectivity ($X_{CO}=27%$ at $240^{\circ}C$ for 100 h). The high activity of 80 wt% $Cu-Ce_{0.8}Zr_{0.2}O_2$ catalyst is attributed to the presence of abundant surface Cu atoms and the low activation energy of the resultant process.

• Transactions of the Korean hydrogen and new energy society
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• v.32 no.6
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• pp.455-463
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• 2021

In this study, CeO₂ support is synthesized from cerium hydroxy carbonate prepared using precipitation/digestion method using KOH and K₂CO₃ as the precipitants. The Cu was impregnated to CeO₂ support with the different loading (Cu loading=10-40 wt. %). The prepared Cu/CeO₂ catalysts were applied to a single stage water gas shift (WGS) reaction. Among the prepared catalysts, the 20Cu/CeO₂ catalyst contained 20 wt.% of Cu showed the highest CO conversion (Xco=68% at 400℃). This result was mainly due to a large amount of active sites. In addition, the activity of the 20 Cu/CeO₂ catalyst was maintained without being deactivated for 100 hours because of the strong interaction between Cu and CeO₂. Therefore, it was confirmed that 20 Cu/CeO₂ is a suitable catalyst for a single WGS reaction.