The properties of cobalt oxide catalyst for ammonia oxidation

Schmidt‐Szałowski, K.; Krawczyk, Krzysztof; Petryk, J.

doi:10.1016/s0926-860x(98)00206-3

Cited by 76 publications

(43 citation statements)

References 4 publications

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“…The dominant CuO diffraction peaks appear near 2 ϭ 35.4926°and 38.7593°. This result established that CuO is the most active phase 14 and is consistent with data from Hung et al 17 and Ning et al 24 As reported previously, La 2 O 3 can be converted to lanthanum hydroxide (La(OH) 3 ). However, under the oxidation conditions present over the Cu-La-Ce catalyst, the oxidation state of Ce can vary between Ce 3ϩ and Ce 4ϩ .…”

Section: Resultssupporting

confidence: 92%

Production of Copper-Based Rare Earth Composite Metal Materials by Coprecipitation and Applications for Gaseous Ammonia Removal

Dong

2011

Journal of the Air & Waste Management Association

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This study addresses the oxidation of ammonia (NH 3 ) at temperatures between 423 and 673 K by selective catalytic oxidation (SCO) over a copper-based, rare earth composite metal material that was prepared by coprecipitating copper nitrate, lanthanum nitrate, and cerium nitrate at various molar ratios. The catalysts were characterized using Brunner, Emmett, and Teller spectroscopy, Fourier-transform infrared spectroscopy, Xray diffraction, ultraviolet-visible spectroscopy, cyclic voltammetric spectroscopy, and scanning electron microscopy. At a temperature of 673 K and an oxygen content of 4%, approximately 99.5% of the NH 3 was reduced by catalytic oxidation over the 6:1:3 copperlanthanum-cerium (molar ratio) catalyst. Nitrogen (N 2 ) was the main product of this NH 3 -SCO process. Results from the activity and selectivity tests revealed that the optimal catalyst for catalytic performance had the highest possible cerium content and specific surface area (43 m 2 /g).

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Section: Resultssupporting

confidence: 92%

Production of Copper-Based Rare Earth Composite Metal Materials by Coprecipitation and Applications for Gaseous Ammonia Removal

Dong

2011

Journal of the Air & Waste Management Association

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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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The properties of cobalt oxide catalyst for ammonia oxidation

Cited by 76 publications

References 4 publications

Production of Copper-Based Rare Earth Composite Metal Materials by Coprecipitation and Applications for Gaseous Ammonia Removal

Production of Copper-Based Rare Earth Composite Metal Materials by Coprecipitation and Applications for Gaseous Ammonia Removal

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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