La(1−)Sr Co1−Fe O3 perovskites prepared by sol–gel method: Characterization and relationships with catalytic properties for total oxidation of toluene

Rousseau, Séverine; Loridant, S.; Delichère, P.; Boréave, A.; Deloume, J.P.; Vernoux, P.

doi:10.1016/j.apcatb.2008.10.022

Cited by 208 publications

(138 citation statements)

References 46 publications

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“…The peaks at 532.6 eV and 530.5 eV correspond to oxygen at different lattice sites. 20,21 Similar results are obtained for other samples. Thus, the XPS results confirm the presence of the elements in their highest valence states in the compounds.…”

Section: Resultssupporting

confidence: 79%

Correlation between structure and oxygen ion dynamics in Y substituted La2Mo2O9 ionic conductors

Paul

Ghosh

2016

AIP Advances

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We have measured the ac conductivity and dielectric spectra for La 2-x Y x Mo 2 O 9 (0.05 ≤ x ≤ 0.20) in wide temperature and frequency ranges. We have obtained the mean square displacement and the spatial extent of nonrandom sub-diffusive regions for oxygen ions by analyzing the ac conductivity and dielectric spectra respectively. The structure of the samples has been studied using X-ray photoelectron spectra, Xray and electron diffraction. It is observed that the composition dependence of these characteristic lengths is correlated with the distance between oxygen ions obtained from structural studies. © 2016 Author(s)

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Section: Resultssupporting

confidence: 79%

Correlation between structure and oxygen ion dynamics in Y substituted La2Mo2O9 ionic conductors

Paul

Ghosh

2016

AIP Advances

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“…O ), respectively. In particular, the additional peak at 533.5 eV over Co 3 O 4 -P was characteristic of the oxygen species in surface adsorbed water [51,52]. As shown in Table 3 …”

Section: Surface Elemental Compositions Metal Oxidation States and Omentioning

confidence: 87%

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

Zhang

Zhong

et al. 2018

Applied Catalysis A: General

174

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A B S T R A C TConsidering the harmful effects of volatile organic compounds (VOCs) on the atmosphere and public health, the search for proper catalytic materials for the effective catalytic elimination of VOCs remains one of the most pressing issues in the environmental field. In this study, a series of mesoporous Co 3 O 4 -n (n = 0.00, 0.0001, 0.01, 0.05, 0.10, 1.00, representing the concentration of HNO 3 aqueous solution) catalysts were fabricated by the acid treatment of Co 3 O 4 that was previously prepared via a hydroxycarbonate precipitation method (Co 3 O 4 -P). The catalytic performances of the prepared catalysts were evaluated for the model reaction of toluene oxidation. An obvious enhancement of catalytic activity in the reaction was achieved over the acid-treated Co 3 O 4 catalysts using lower HNO 3 concentrations, with Co 3 O 4 -0.01 exhibiting the optimum catalytic activity (T 90 = 225°C, 15°C lower than that of Co 3 O 4 -P), excellent catalytic durability under dry conditions and a high regeneration capability under humid conditions. Benefitting from the dilute acid treatment, the Co 3 O 4 -n (n = 0.01, 0.05, 0.10) catalysts presented higher specific surface areas, more weak acidic sites and higher abundances of surface Co 2+ and O ads species, which were regarded as the key factors responsible for their enhanced catalytic activities.

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“…Perovskites in the form of ABO 3 have been considered as promising alternatives for low-cost automotive catalysts with excellent redox properties and high thermal durability [4,5]. The chemical properties of the perovskite materials are also known for their flexible characteristics which are associated with their A and/or B site substitution capabilities and availability of a wide variety of sub-stoichiometric structures [6].…”

Section: Introductionmentioning

confidence: 99%

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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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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La(1−)Sr Co1−Fe O3 perovskites prepared by sol–gel method: Characterization and relationships with catalytic properties for total oxidation of toluene

Cited by 208 publications

References 46 publications

Correlation between structure and oxygen ion dynamics in Y substituted La2Mo2O9 ionic conductors

Correlation between structure and oxygen ion dynamics in Y substituted La2Mo2O9 ionic conductors

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

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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