Characterization and catalytic activity for the NO decomposition and reduction by CO of nanosized Co3O4

Zhang, Zhaoliang; Geng, Haoran; Zheng, Lisheng; Du, Bin

doi:10.1016/j.jallcom.2004.09.013

Cited by 52 publications

(31 citation statements)

References 13 publications

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“…[1][2][3][4][5] Co 3 O 4 and its doped or supported systems are well known to be active for the oxidation of carbon monoxide at low temperatures. [6][7][8][9][10][11][12][13] Recently, Xie et al reported that Co 3 O 4 nanorods not only catalyze CO oxidation at temperatures as low as À77 8C, but also remain stable in a moist stream of normal feed gas. [14] They also found that the Co 3 O 4 nanorods predominantly expose their (110) planes, favoring the presence of active Co 3 + species at the surface.…”

Section: Introductionmentioning

confidence: 99%

A DFT Study of CO Catalytic Oxidation by N₂O or O₂ on the Co₃O₄(110) Surface

Yang

et al. 2009

ChemCatChem

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The reaction mechanisms for CO catalytic oxidation by N2O or O2 on the Co3O4(110) surface were studied by DFT slab calculations. CO chemisorbs preferably at a surface Co3+ site. After the Co3+ site is completely covered, CO adsorbs at the neighboring twofold coordinated surface oxygen atom bonded to Co2+ and Co3+ cations, resulting in the formation of CO2 and an oxygen vacancy with a low energy barrier of 0.033 eV, which rationalizes the experimental observation that Co3O4‐based systems are active for CO oxidation at low temperatures. N2O or O2 interacts with the oxygen vacancy site to regenerate the surface, leaving N2 or the activated O2− species to be attacked by the second CO to yield CO2 to proceed with the catalytic cycle. The CO oxidation reaction follows the Mars– van Krevelen mechanism.

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Section: Introductionmentioning

confidence: 99%

A DFT Study of CO Catalytic Oxidation by N₂O or O₂ on the Co₃O₄(110) Surface

Yang

et al. 2009

ChemCatChem

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“…As a promising candidate of precious metal catalysts, cobalt oxide catalysts have attracted considerable attentions because of not only its high activity for CO and hydrocarbon oxidation [18,19], but also its use in the Fischer-Tropsch synthesis [20], NO decomposition [21], and ammonia oxidation [22]. The low-temperature CO oxidation over single component, composite and supported cobalt oxide catalysts have been studied [12][13][14][15][16][17][18], and these cobalt oxides show significant catalytic activity for CO oxidation.…”

Section: Introductionmentioning

confidence: 99%

Effect of CeO2 Doping on Structure and Catalytic Performance of Co3O4 Catalyst for Low-Temperature CO Oxidation

2008

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The effect of CeO 2 doping on structure and catalytic performance of Co 3 O 4 catalyst was studied for lowtemperature CO oxidation. The Co 3 O 4 catalyst was prepared by a precipitation method and the CeO 2 /Co 3 O 4 catalyst was prepared by an impregnation method. Their catalytic performance had been studied with a continuous flowing microreactor. The results reveal that the CeO 2 /Co 3 O 4 catalyst exhibits much better resistance to water vapor poisoning than the Co 3 O 4 catalyst for CO oxidation. The CeO 2 /Co 3 O 4 catalyst can maintain CO complete conversion at least 8,400 min at 110°C with 0.6% water vapor in the feed gas, while the Co 3 O 4 catalyst can maintain at 100% for only 100 min. Characterizations with XRD, TEM and TPR suggest that the CeO 2 /Co 3 O 4 catalyst possesses higher dispersion degree, smaller particles and larger S BET , due to the doping of Ceria, and exists the interaction between CeO 2 and Co 3 O 4 , which may contribute to the excellent water resistance for low-temperature CO oxidation. Furthermore, the H 2 detected in the reactor outlet gas seems to indicate that the water-gas shift reaction is the more direct reason.

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“…As a promising candidate of precious metal catalysts, cobalt oxide catalysts have attracted considerable attention because of not only its high activity for CO and hydrocarbon oxidation [26,38], but also its use in the Fischer-Tropsch synthesis [39], NO decomposition [40], and ammonia oxidation [41]. Particularly, the lowtemperature CO oxidation over Co 3 O 4 has been studied by several groups.…”

Section: Introductionmentioning

confidence: 99%

Preparation and catalytic performance of Co3O4 catalysts for low-temperature CO oxidation

et al. 2007

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Without use of any surfactant or oxidant, a series of Co 3 O 4 catalysts have been prepared from cobalt nitrate aqueous solution via a very simple liquid-precipitation method with ammonium acid carbonate followed by calcination at various temperatures. The catalytic performance of the Co 3 O 4 for CO oxidation has been studied with a continuous flowing laboratory microreactor system. The results show that the CO conversion of all the samples can reach 100% at ambient temperature. The catalyst calcined at 300°C is able to maintain its activity for CO complete oxidation more than 500 min at 25°C and about 240 min even at )78°C. High reaction temperature results in a high catalytic stability, while the catalytic stability decreases with further increasing the reaction temperature. Characterizations with X-ray powder diffraction and transmission electron microscopy suggest that all the samples exist as a pure Co 3 O 4 phase with the spinel structure, the samples are apt to aggregate and the specific surface area gradually decreases with increasing the calcination temperature, which directly leads to the decrease of catalytic stability. Furthermore, the amount of active oxygen species measured by CO titration experiments appears to be critical for catalytic performance.

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Characterization and catalytic activity for the NO decomposition and reduction by CO of nanosized Co3O4

Cited by 52 publications

References 13 publications

A DFT Study of CO Catalytic Oxidation by N₂O or O₂ on the Co₃O₄(110) Surface

A DFT Study of CO Catalytic Oxidation by N₂O or O₂ on the Co₃O₄(110) Surface

Effect of CeO2 Doping on Structure and Catalytic Performance of Co3O4 Catalyst for Low-Temperature CO Oxidation

Preparation and catalytic performance of Co3O4 catalysts for low-temperature CO oxidation

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Characterization and catalytic activity for the NO decomposition and reduction by CO of nanosized Co3O4

Cited by 52 publications

References 13 publications

A DFT Study of CO Catalytic Oxidation by N2O or O2 on the Co3O4(110) Surface

A DFT Study of CO Catalytic Oxidation by N2O or O2 on the Co3O4(110) Surface

Effect of CeO2 Doping on Structure and Catalytic Performance of Co3O4 Catalyst for Low-Temperature CO Oxidation

Preparation and catalytic performance of Co3O4 catalysts for low-temperature CO oxidation

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A DFT Study of CO Catalytic Oxidation by N₂O or O₂ on the Co₃O₄(110) Surface

A DFT Study of CO Catalytic Oxidation by N₂O or O₂ on the Co₃O₄(110) Surface