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Christoforou, Sophia C.; Efthimiadis, Evangelos A.; Vasalos, I.A.

doi:10.1023/a:1015360425678

Cited by 49 publications

(19 citation statements)

References 25 publications

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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

107

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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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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

107

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“…Water solutions of the corresponding metal salts were impregnated on c-Al 2 O 3 carrier (Engelhard, 180-355 lm) so as to yield 2.0 wt% metal loading. These particular high loadings were essentially dictated by the related literature [12,13]. Following impregnation, the catalysts were dried at 120°C for 2 h and then they were calcined at 600°C for 4 h under air flow.…”

Section: Methodsmentioning

confidence: 99%

“…Supported metal or metal oxides seem to be more effective compared to other catalytic systems. In most cases alumina was used as carrier, while Pd, Rh, Ru, Cu, Fe, Ni, Co, Cr, etc., as active sites [2,12,13].…”

Section: Introductionmentioning

confidence: 99%

N2O Abatement Over γ-Al2O3 Supported Catalysts: Effect of Reducing Agent and Active Phase Nature

et al. 2009

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A series of metal catalysts (Pd, Rh, Ru, Cu, Fe, In and Ni) supported on c-Al 2 O 3 carrier, were evaluated during N 2 O catalytic conversion to N 2 in the absence and presence of excess oxygen and reducing agents (CH 4 or C 3 H 8 ). Among all catalysts tested, Pd-, Ru-and Rh-based samples exhibited the best catalytic performance, in all reaction conditions examined. The reaction was inhibited by O 2 , in particular at lower temperatures, while its effect was essentially negligible at higher ones. In the presence of reducing agents and under lean reaction conditions, N 2 O conversion was comparably enhanced, with C 3 H 8 being more efficient than CH 4 ; however even in the presence of hydrocarbons N 2 O decomposition is the major pathway for N 2 O abatement, since reducing agents mainly act as oxygen scavengers reducing and concurrently activating the metal sites. The influence of different co-existing gases (CO, H 2 O and SO 2 ) on the performance of Pd supported catalysts was also investigated, whereas thermal stability tests in the presence of SO 2 indicate a gradual irreversible decrease in activity until a new steady state was established.

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“…Literature references have shown that high loadings of cobalt can be active for the oxidation of NO to NO 2 1,2,3,4,5 . Several series of Co-based catalysts were synthesized and tested for the NO to NO 2 oxidation reaction.…”

Section: No Oxidation: No + ½ O 2 ↔ No 2 (δH Rxn = -571 Kj/mol)mentioning

confidence: 99%