A comparative study of catalysts for the preferential CO oxidation in excess hydrogen

Eun Yong Ko; Eun Duck Park; Kyung Won Seo; Hyun Chul Lee; Doohwan Lee; Soonho Kim

doi:10.1016/j.cattod.2006.05.072

A comparative study of catalysts for the preferential CO oxidation in excess hydrogen

Eun Yong Ko, Eun Duck Park, Kyung Won Seo, Hyun Chul Lee, Doohwan Lee, Soonho Kim

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

93 Scopus citations

Abstract

Selective CO oxidation in the presence of excess hydrogen was studied over metal oxides (CoO and CuO-CeO₂), supported gold catalysts (Au/γ-Al₂O₃, Au/CuO, Au/CeO₂/γ-Al₂O₃, Au/CuO-CeO₂ and Au/CeO₂), and supported Pt catalysts (Pt/γ-Al₂O₃, Pt-Ni/γ-Al₂O₃, and Pt-Co/γ-Al₂O₃). The methanation was dominant over CoO in the presence of excess H₂. CuO-CeO₂ was quite selective for CO oxidation at low temperatures. However, the presence of CO₂ and H₂O retarded its catalytic activity. No beneficial effect to CO₂ selectivity was observed when Pt, Ru, Ni, and Co was added to CuO-CeO₂ as a modifier. Supported gold catalysts showed the high CO conversion at low temperatures. However, the CO₂ selectivity decreased noticeably with increasing H₂ concentration in a reactant. Pt-Ni/γ-Al₂O₃ showed the highest CO conversion with a high CO₂ selectivity over a wide reaction temperature among above catalysts examined at the same reaction condition. This catalyst also showed the best performance in the presence of 2 vol.% H₂O and 20 vol.% CO₂.

Original language	English
Pages (from-to)	377-383
Number of pages	7
Journal	Catalysis Today
Volume	116
Issue number	3
DOIs	https://doi.org/10.1016/j.cattod.2006.05.072
State	Published - 15 Aug 2006

Keywords

CO oxidation
Fuel cell
PEMFC
PROX
Pt-Ni/γ-AlO

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title = "A comparative study of catalysts for the preferential CO oxidation in excess hydrogen",

abstract = "Selective CO oxidation in the presence of excess hydrogen was studied over metal oxides (CoO and CuO-CeO2), supported gold catalysts (Au/γ-Al2O3, Au/CuO, Au/CeO2/γ-Al2O3, Au/CuO-CeO2 and Au/CeO2), and supported Pt catalysts (Pt/γ-Al2O3, Pt-Ni/γ-Al2O3, and Pt-Co/γ-Al2O3). The methanation was dominant over CoO in the presence of excess H2. CuO-CeO2 was quite selective for CO oxidation at low temperatures. However, the presence of CO2 and H2O retarded its catalytic activity. No beneficial effect to CO2 selectivity was observed when Pt, Ru, Ni, and Co was added to CuO-CeO2 as a modifier. Supported gold catalysts showed the high CO conversion at low temperatures. However, the CO2 selectivity decreased noticeably with increasing H2 concentration in a reactant. Pt-Ni/γ-Al2O3 showed the highest CO conversion with a high CO2 selectivity over a wide reaction temperature among above catalysts examined at the same reaction condition. This catalyst also showed the best performance in the presence of 2 vol.% H2O and 20 vol.% CO2.",

keywords = "CO oxidation, Fuel cell, PEMFC, PROX, Pt-Ni/γ-AlO",

author = "Ko, {Eun Yong} and Park, {Eun Duck} and Seo, {Kyung Won} and Lee, {Hyun Chul} and Doohwan Lee and Soonho Kim",

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AU - Ko, Eun Yong

AU - Park, Eun Duck

AU - Seo, Kyung Won

AU - Lee, Hyun Chul

AU - Lee, Doohwan

AU - Kim, Soonho

PY - 2006/8/15

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N2 - Selective CO oxidation in the presence of excess hydrogen was studied over metal oxides (CoO and CuO-CeO2), supported gold catalysts (Au/γ-Al2O3, Au/CuO, Au/CeO2/γ-Al2O3, Au/CuO-CeO2 and Au/CeO2), and supported Pt catalysts (Pt/γ-Al2O3, Pt-Ni/γ-Al2O3, and Pt-Co/γ-Al2O3). The methanation was dominant over CoO in the presence of excess H2. CuO-CeO2 was quite selective for CO oxidation at low temperatures. However, the presence of CO2 and H2O retarded its catalytic activity. No beneficial effect to CO2 selectivity was observed when Pt, Ru, Ni, and Co was added to CuO-CeO2 as a modifier. Supported gold catalysts showed the high CO conversion at low temperatures. However, the CO2 selectivity decreased noticeably with increasing H2 concentration in a reactant. Pt-Ni/γ-Al2O3 showed the highest CO conversion with a high CO2 selectivity over a wide reaction temperature among above catalysts examined at the same reaction condition. This catalyst also showed the best performance in the presence of 2 vol.% H2O and 20 vol.% CO2.

AB - Selective CO oxidation in the presence of excess hydrogen was studied over metal oxides (CoO and CuO-CeO2), supported gold catalysts (Au/γ-Al2O3, Au/CuO, Au/CeO2/γ-Al2O3, Au/CuO-CeO2 and Au/CeO2), and supported Pt catalysts (Pt/γ-Al2O3, Pt-Ni/γ-Al2O3, and Pt-Co/γ-Al2O3). The methanation was dominant over CoO in the presence of excess H2. CuO-CeO2 was quite selective for CO oxidation at low temperatures. However, the presence of CO2 and H2O retarded its catalytic activity. No beneficial effect to CO2 selectivity was observed when Pt, Ru, Ni, and Co was added to CuO-CeO2 as a modifier. Supported gold catalysts showed the high CO conversion at low temperatures. However, the CO2 selectivity decreased noticeably with increasing H2 concentration in a reactant. Pt-Ni/γ-Al2O3 showed the highest CO conversion with a high CO2 selectivity over a wide reaction temperature among above catalysts examined at the same reaction condition. This catalyst also showed the best performance in the presence of 2 vol.% H2O and 20 vol.% CO2.

KW - CO oxidation

KW - Fuel cell

KW - PEMFC

KW - PROX

KW - Pt-Ni/γ-AlO

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A comparative study of catalysts for the preferential CO oxidation in excess hydrogen

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Keywords

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