A study on N2O catalytic decomposition over Co/MgO catalysts

Shen, Qun; Li, Landong; Li, Jinjun; Tian, Hua; Hao, Zhengping

doi:10.1016/j.jhazmat.2008.07.104

Cited by 72 publications

(37 citation statements)

References 34 publications

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“…A large number of catalysts, such as pure oxides, noble metals, mixed oxides, and iron zeolites have been evaluated for N 2 O decomposition reaction [6][7][8][9][10]. Among them, noble-metal catalysts exhibit satisfactory activity at intermediate temperatures [11,12].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Decomposition of N2O over Cu–Zn/ZnAl2O4 Catalysts

et al. 2017

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Abstract:The catalytic decomposition of N 2 O was investigated over Cu-Zn/ZnAl 2 O 4 catalysts in the temperature range of 400-650 • C Catalytic samples have been prepared by wet impregnation method. Prepared catalysts were characterized using several techniques like BET surface area, X-ray diffraction (XRD), and Scanning electron microscopy (SEM). The Cu-Zn/ZnAl 2 O 4 showed higher catalytic performance along with long term stability during N 2 O decomposition. The Cu-Zn/ZnAl 2 O 4 catalysts yielded 100% N 2 O conversion at 650 • C. The Cu-Zn/ZnAl 2 O 4 catalysts are promising for decrease this strong greenhouse gas in the chemical industry.

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Section: Introductionmentioning

confidence: 99%

Catalytic Decomposition of N2O over Cu–Zn/ZnAl2O4 Catalysts

et al. 2017

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“…However, despite such promising performance in the N 2 O decomposition reaction, the development of an industrial scale catalyst based on Co 3 O 4 as a bulk active phase was hindered by the unsatisfactory mechanical stability of the catalyst extrudates and by the high price of cobalt as well. These problems can be solved quite readily by the dispersion of cobalt spinel active phase on a shaped support such as alumina, silica, magnesia or ceria [4,[18][19][20][21][22]. However, since the alkali promoter loading is crucial for the deN 2 O performance of the catalyst, and both the under-and the over-doping lead to pronounced deterioration of the activity, the alkali promotion level must be carefully adjusted for a given catalyst.…”

Section: Introductionmentioning

confidence: 99%

Optimization of cesium and potassium promoter loading in alkali-doped Zn0.4Co2.6O4|Al2O3 catalysts for N2O abatement

Ciura

Grzybek

Wojcik

et al. 2017

Reac Kinet Mech Cat

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A series of potassium or cesium doped Zn 0.4 Co 2.6 O 4 |Al 2 O 3 catalysts with different alkali loadings were prepared, characterized with respect to chemical composition (XRF), structure (XRD, RS) morphology (TEM), and the alkali promoter thermal stability. A strong beneficial effect on the deN 2 O activity of the Zn 0.4 Co 2.6 O 4 |Al 2 O 3 catalyst (decrease in the T 50% by about 80°C) was observed for both promoters at different surface coverages. It was found that in comparison to a rather narrow range of optimal cesium loading (0.5-2 atoms/nm 2 ) a comparable promotional effect of potassium doping was observed for a slightly wider surface concentrations (0.5-3 atoms/nm 2 ). Such difference was attributed to surface dispersion of potassium over the alumina support and the spinel active phase, while cesium was found to be located mainly on the spinel phase. For practical applications, the superiority of potassium over cesium consist in fact that a similar beneficial effect is associated with much higher thermal stability in the temperature range of the catalyst deN 2 O operation and lower price of the promoter precursor.

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“…However, for practical applications this problem can be easily solved by dispersion of cobalt spinel active phase on a high surface area support such as alumina, silica, magnesia or ceria [29,30,31,32,33,34,35]. Among them CeO 2 , owing to its particular properties (redox and oxygen storage capacity), in many cases appeared to be superior for deN 2 O catalytic application [36].…”

Section: Introductionmentioning

confidence: 99%

Strong dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: The role of the interface periphery

Grzybek

Stelmachowski

Gudyka

et al. 2016

Applied Catalysis B: Environmental

109

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dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: the role of the interface periphery, Applied Catalysis B, Environmental http://dx.doi.org/10. 1016/j.apcatb.2015.07.027 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. The catalytic tests in deN 2 O reaction revealed that the 10 wt.% of cobalt spinel in supported system is able to reproduce the activity of bare Co 3 O 4 catalyst. However, it was found that the catalyst with the lowest content of Co 3 O 4 equal to 1 wt.% exhibits the highest apparent reaction rate per mass of the spinel active phase. The observed activity was explained basing on the transmission electron microscopy analysis in terms of the dispersion of spinel phase over ceria support. A simple model that accounts for the observed strong dispersion effect is proposed. It consists in a two-step mechanism, where N 2 O is dissociated on the spinel nanograins and the resultant oxygen species are preferentially recombined at the Co 3 O 4 /CeO 2 interface periphery.

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A study on N2O catalytic decomposition over Co/MgO catalysts

Cited by 72 publications

References 34 publications

Catalytic Decomposition of N2O over Cu–Zn/ZnAl2O4 Catalysts

Catalytic Decomposition of N2O over Cu–Zn/ZnAl2O4 Catalysts

Optimization of cesium and potassium promoter loading in alkali-doped Zn0.4Co2.6O4|Al2O3 catalysts for N2O abatement

Strong dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: The role of the interface periphery

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