Surface reconstruction of supported Pd on LaCoO3: Consequences on the catalytic properties in the decomposition of N2O

Dacquin, Jean‐Philippe; Dujardin, Christophe; Granger, Pascal

doi:10.1016/j.jcat.2007.10.023

Cited by 92 publications

(84 citation statements)

References 19 publications

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“…It is known that treatment of Co and Mn-based perovskites with an aggressive reducing agent such as H 2 (g) at high enough temperatures may cause reversible or irreversible structural changes [6,43]. This was found to be particularly valid for LaCoO 3 , where Dacquin and Dujardin showed that destruction of the perovskite structure due to the two-step reduction of the B-site cation (via Co 3+ → Co +2 → Co 0 ) led to the formation of metallic Co and La 2 O 3 [44][45][46].…”

Section: No 2 Adsorption/desorption Behavior Of Perovskite Surfacesmentioning

confidence: 95%

Palladium doped perovskite-based NO oxidation catalysts: The role of Pd and B-sites for NOx adsorption behavior via in-situ spectroscopy

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Vovk

et al. 2014

Applied Catalysis B: Environmental

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a b s t r a c tPerovskite-based materials (LaMnO 3 , Pd/LaMnO 3 , LaCoO 3 and Pd/LaCoO 3 ) were synthesized, characterized (via BET, XRD, Raman spectroscopy, XPS and TEM) and their NO x (x = 1,2) adsorption characteristics were investigated (via in-situ FTIR and TPD) as a function of the nature of the B-site cation (i.e. Mn vs Co), Pd/PdO incorporation and H 2 -pretreatment. NO x adsorption on of LaMnO 3 was found to be significantly higher than LaCoO 3 , in line with the higher SSA of LaMnO 3 . Incorporation of PdO nanoparticles with an average diameter of ca. 4 nm did not have a significant effect on the amount of NO 2 adsorbed on fresh LaMnO 3 and LaCoO 3 . TPD experiments suggested that saturation of fresh LaMnO 3 , Pd/LaMnO 3 , LaCoO 3 and Pd/LaCoO 3 with NO 2 at 323 K resulted in the desorption of NO 2 , NO, N 2 O and N 2 (without O 2 ) below 700 K, while above 700 K, NO x desorption was predominantly in the form of NO + O 2 . Perovskite materials were found to be capable of activating N-O linkages typically at ca. 550 K (even in the absence of an external reducing agent) forming N 2 and N 2 O as direct NO x decomposition products. H 2 -pretreatment yielded a drastic boost in the NO oxidation and NO x adsorption of all samples, particularly for the Cobased systems. Presence of Pd further boosted the NO x uptake upon H 2 -pretreatment. Increase in the NO x adsorption of H 2 -pretreated LaCoO 3 and Pd/LaCoO 3 surfaces could be associated with the electronic changes (i.e. reduction of B-site cation), structural changes (surface reconstruction and SSA increase), reduction of the precious metal oxide (PdO) into metallic species (Pd), and the generation of oxygen defects on the perovskite. Mn-based systems were more resilient toward B-site reduction. Pd-addition suppressed the B-site reduction and preserved the ABO 3 perovskite structure.

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Section: No 2 Adsorption/desorption Behavior Of Perovskite Surfacesmentioning

confidence: 95%

Palladium doped perovskite-based NO oxidation catalysts: The role of Pd and B-sites for NOx adsorption behavior via in-situ spectroscopy

Say

Doğaç

Vovk

et al. 2014

Applied Catalysis B: Environmental

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“…Up to now, many catalytic systems such as noble metals [5,6,7], metal oxides [8,9,10], ion-exchanged zeolites, calcined hydrotalcites [ [11,12,13], mesoporous silicas [14,15] were investigated for the low temperature deN 2 O reaction. One of the simple promising generic systems exhibiting high catalytic activity in this reaction is cobalt spinel [16,17,18,19,20], which can be additionally modified by structural [21,22,23,24] and surface donation [24,25,26,27,28] …”

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

106

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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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“…To this end, various kinds of catalysts, such as metal oxides [3][4][5], supported noble metals [6] and transition metal-exchanging zeolites (Co-zeolite, Fe-zeolite, etc.) [7][8][9][10][11][12][13], have been intensively investigated for N 2 O direct decomposition.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive investigation of influences of NO and O2 on N2O-SCR by CH4 over Fe-USY zeolite

Shen

et al. 2009

Applied Catalysis B: Environmental

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Surface reconstruction of supported Pd on LaCoO3: Consequences on the catalytic properties in the decomposition of N2O

Cited by 92 publications

References 19 publications

Palladium doped perovskite-based NO oxidation catalysts: The role of Pd and B-sites for NOx adsorption behavior via in-situ spectroscopy

Palladium doped perovskite-based NO oxidation catalysts: The role of Pd and B-sites for NOx adsorption behavior via in-situ spectroscopy

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

A comprehensive investigation of influences of NO and O2 on N2O-SCR by CH4 over Fe-USY zeolite

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