Preferential oxidation of CO on copper-containing manganese oxides

Hasegawa, Y.; Maki, Ryo-Uta; Sano, Makoto; Miyake, Takanori

doi:10.1016/j.apcata.2009.09.028

Cited by 49 publications

(16 citation statements)

References 33 publications

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“…A correlation between the increasing of Mn concentration and the steady state CuMnOx catalyst activity is increased at certain levels is revealed [18]. From the characterization work, we can get that the phase composition and reduction properties of CuMnOx catalyst are highly depended on the (Cu:Mn) molar ratio [12].…”

Section: Identification and Quantification Of Elementsmentioning

confidence: 82%

“…The increase oxidation rates are correlated with the appearance of a "reactive" CO species which existed in significant amounts only during intermittent operation [27]. The homogeneous nature of CuMnOx catalyst is an important factors effect on the high catalytic activity [12]. The CO oxidation rate enhancement is possible only if the surface is exposed to oxygen for a minimum period without any CO being present in the gas phase [32].…”

Section: Effects Of Different Co Flow Ratementioning

confidence: 99%

“…This result shows that drying the precipitate under these conditions for 12 h gives the highest CO conversion. During the drying period, the solution may be retained by the porous support, and it may be migrated by capillary flow and diffusion, therefore; the solute redistributed by desorption and re-adsorption [12]. When the solvent evaporates, precipitation of solute happens as the solution becomes supersaturated and brings crystallization of the precursors in the pores and an outer surface of the carrier.…”

Section: Effects Of Drying Timementioning

confidence: 99%

“…The hopcalite catalyst in the form of CuMnOx is a well-known catalyst for low-temperature CO oxidation process and its application in many different fields like air purification devices, fuel cells, gas masks and automobile emissions control purposes [10]. A literature survey reveals that CuMnOx catalyst is highly active in the amorphous state even at room temperature, but it has observed that the CuMnOx catalyst lose their activity after exposition at temperatures above 500 o C, where crystallization of the spinel CuMn2O4 was occurred [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation

Dey

Dhal

Прасад

2017

Bull. Chem. React. Eng. Catal.

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The hopcalite (CuMnOx) catalyst is a well-known catalyst for oxidation of CO at ambient temperature. It has prepared by co-precipitation method and the preparation parameters were like Copper/Manganese (Cu:Mn) molar ratios, drying temperature, drying time, calcination temperature and calcination time has an influence on activity of the resultant catalyst. The activity of the catalyst was measured in flowing air calcinations (FAC) conditions. The reaction temperature was increased from ambient to a higher value at which complete oxidation of CO was achieved. The particle size, weight of catalyst and CO flow rate in the air were also influenced by the activity of the catalyst for CO oxidation. The characterizations of the catalysts were done by several techniques like XRD, FTIR, BET, SEM-EDX and XPS. These results were interpreted in terms of the structure of the active catalyst. The main aim of this paper was to identify the optimum preparation conditions of CuMnOx catalyst with respect to the performance of catalyst for CO oxidation.

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Section: Identification and Quantification Of Elementsmentioning

confidence: 82%

Section: Effects Of Different Co Flow Ratementioning

confidence: 99%

Section: Effects Of Drying Timementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation

Dey

Dhal

Прасад

2017

Bull. Chem. React. Eng. Catal.

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“…In the previous study, we have observed that the CuMnOx catalyst is also active for CO oxidation at a long time. In the previous study Hasegawa et [28][29]19].…”

Section: Introductionmentioning

confidence: 99%

Study of Hopcalite (CuMnOx) Catalysts Prepared Through A Novel Route for the Oxidation of Carbon Monoxide at Low Temperature

Dey

Dhal

Прасад

2017

Bull. Chem. React. Eng. Catal.

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Carbon monoxide (CO) is a poisonous gas, recognized as a silent killer. The gas is produced by incomplete combustion of carbonaceous fuel. Recent studies have shown that hopcalite group is one of the promising catalysts for CO oxidation at low temperature. In this study, hopcalite (CuMnOx) catalysts were prepared by KMnO4 co-precipitation method followed by washing, drying the precipitate at different temperatures (22, 50, 90, 110, and 120 o C) for 12 h in an oven and subsequent calcination at 300 o C in stagnant air, flowing air and in a reactive gas mixture of (4.5% CO in air) to do the reactive calcination (RC). The prepared catalysts were characterized by XRD, FTIR, SEM-EDX, XPS, and BET techniques. The activity of the catalysts was evaluated in a tubular reactor under the following conditions: 100 mg catalyst, 2.5% CO in air, total flow rate 60 mL/min and temperature varying from ambient to a higher value, at which complete oxidation of CO was achieved. The order of calcination strategies based on activity for hopcalite catalysts was observed to be as: RC > flowing air > stagnant air. In the kinetics study of CuMnOx catalyst prepared in RC conditions the frequency factor and activation energy were found to be 5.856×10 5 (g.mol)/(gcat.h) and 36.98 kJ/gmol, respectively.

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Efficient CO Oxidation using Co₃O₄−CeO₂ Nanoparticles Supported on Resin–Based Spherical Activated Carbon with Controllable Oxygen Species

Chen,

Liu,

Wang

et al. 2024

ChemistrySelect

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The oxygen vacancies and surface oxygen species play pivotal roles in CO catalytic oxidation. In this study, Co3O4−CeO2 supported on resin based spherical activated carbon was fabricated and the effect of CeO2 on surface oxygen species was demonstrated through controlling various Ce contents. When Ce content was optimal (nCo : nCe=9), the maximum surface adsorbed oxygen content (60.3 %) is displayed and the catalyst achieved good CO conversion (T100=110 °C), water resistance and robust stability. DFT simulation calculation confirmed that the energy barriers of two transition states significantly decreased to 0.60 eV and 0.37 eV, respectively, with the addition of CeO2. The results indicate that the presence of CeO2 is conducive to the increasement of surface adsorbed oxygen content and optimal Co/Ce ratio is the most favorable for the CO oxidation. It is attributed to the visible decline of the energy barrier between oxygen vacancies and gas–phase oxygen at the Co3O4−CeO2 interface, and the process of oxygen vacancies replenishment could be more prone to occur at the interface. This study may provide a protocol for further improving surface species on supporting catalysts.

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Preferential oxidation of CO on copper-containing manganese oxides

Cited by 49 publications

References 33 publications

Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation

Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation

Study of Hopcalite (CuMnOx) Catalysts Prepared Through A Novel Route for the Oxidation of Carbon Monoxide at Low Temperature

Efficient CO Oxidation using Co₃O₄−CeO₂ Nanoparticles Supported on Resin–Based Spherical Activated Carbon with Controllable Oxygen Species

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Preferential oxidation of CO on copper-containing manganese oxides

Cited by 49 publications

References 33 publications

Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation

Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation

Study of Hopcalite (CuMnOx) Catalysts Prepared Through A Novel Route for the Oxidation of Carbon Monoxide at Low Temperature

Efficient CO Oxidation using Co3O4−CeO2 Nanoparticles Supported on Resin–Based Spherical Activated Carbon with Controllable Oxygen Species

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Efficient CO Oxidation using Co₃O₄−CeO₂ Nanoparticles Supported on Resin–Based Spherical Activated Carbon with Controllable Oxygen Species