Influence of Al doping in LaCoO3 on structural, electrical and magnetic properties

Aswin, V; Kumar, Pramod; Singh, Pooja; Gupta, Anurag; Rayaprol, Sudhindra; Dogra, Anjana

doi:10.1007/s10853-014-8595-3

Cited by 14 publications

(7 citation statements)

References 44 publications

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“…1), which manifests in the more significant high-energy shoulder in the L 3edge (781.7 eV, Supplementary Fig. 3a, b) as well, as reported previously 20 . In UHV conditions, Zn 2+ and Ni 3+ substitution hardly affects the fraction of Co 3+ HS to LS states.…”

Section: Resultssupporting

confidence: 88%

Electronic parameters in cobalt-based perovskite-type oxides as descriptors for chemocatalytic reactions

et al. 2020

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Perovskite-type transition metal (TM) oxides are effective catalysts in oxidation and decomposition reactions. Yet, the effect of compositional variation on catalytic efficacy is not well understood. The present analysis of electronic characteristics of B-site substituted LaCoO 3 derivatives via in situ X-ray absorption spectroscopy (XAS) establishes correlations of electronic parameters with reaction rates: TM t 2g and e g orbital occupancy yield volcanotype or non-linear correlations with NO oxidation, CO oxidation and N 2 O decomposition rates. Covalent O 2p-TM 3d interaction, in ultra-high vacuum, is a linear descriptor for reaction rates in NO oxidation and CO oxidation, and for N 2 O decomposition rates in O 2 presence. Covalency crucially determines the ability of the catalytically active sites to interact with surface species during the kinetically relevant step of the reaction. The nature of the kinetically relevant step and of surface species involved lead to the vast effect of XAS measurement conditions on the validity of correlations.

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Section: Resultssupporting

confidence: 88%

Electronic parameters in cobalt-based perovskite-type oxides as descriptors for chemocatalytic reactions

et al. 2020

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“…synthesized LCO samples can be estimated to be in the range of ≈ 10 5 Ωcm. This is about 3 orders of magnitude higher than the resistivity reported by Aswin et al at the same temperature [10], but in a quite similar range as the values reported by English et al [61] and Jirak et al [63]. Despite the relatively large magnetic Curie-tail shown above (section 3.3.…”

Section: Resistivity Vs Temperature Curvessupporting

confidence: 75%

“…On the one hand, doped and undoped LCO compounds are interesting for applications in hydro-carbon oxidation exhaust catalysis [1][2][3], and in solid oxide fuel cells [4,5]. On the other hand, LCO is regarded a model compound for many cobaltites in terms of the thermally induced magnetic spin state transition, which has triggered a great deal of fundamental research into this compound [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The role of defects in microwave and conventionally synthesized LaCoO3 perovskite

Prado‐Gonjal

Gutiérrez-Seijas

Ansorregui

et al. 2016

Journal of the European Ceramic Society

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Citation for published item:rdoEqonjlD tF nd quti¡ errezEeijsD tF nd rerrero ensorreguiD sF nd wor¡ nD iF nd erryD sF nd hmidtD F @PHITA 9he role of defets in mirowve nd onventionlly synthesized vgoyQ perovskiteF9D tournl of the iuropen germi oietyFD QT @SAF ppF IIWUEIPHTF Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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“…Substituted LaAl perovskites remain rhombohedral also at very high temperature and, in the case of LaCoO3, the rhombohedral structure is also stable above 970 °C [48,49]. In the case of solid solutions intermediate between LaAlO3 and LaCoO3, Aswin et al observed that the rhombohedral phase was accompanied by a secondary monoclinic perovskite phase [50]. No monoclinic phase was observed in our samples.…”

Section: Activity Testsmentioning

confidence: 41%

Co-doped LaAlO3 perovskite oxide for NOx-assisted soot oxidation

Tran

Martinović

Ceretti

et al. 2020

Applied Catalysis A: General

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In the framework of nowadays challenges in the automotive catalysis, directed to the mitigation of pollution caused by the emissions of internal combustion engines, a series of LaAl1-xCoxO3 perovskites were investigated with the purpose of enhancing the oxidation of soot in the presence of NOx. Perovskite oxides LaAl1-xCoxO3 (x=0; 0.25; 0.5; 0.75 and 1) were synthesized by a solgel route and characterized by different methods: X-Ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR), N2-sorption, O2/NOx-temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). The perovskite oxides were tested as catalysts for NO oxidation in isothermal mode and for NOx-assisted soot oxidation in temperature programmed reaction. Structural results reveal that Co is well incorporated in the perovskite structure expanding the unit cell, and doping Co may result in the distortion of the BO6 octahedra of the general ABO3 perovskite structure. An increase in Co substitution with x up to 0.75 remarkably promotes the oxidation activity, whereas total replacement of Al by Co degrades the catalytic performance. Among the prepared solids, LaAl0.25Co0.75O3 is the most active for NO oxidation, with a conversion of 78% at 320 °C, and it also exhibits the highest activity for NOxassisted soot oxidation, with a T10% of 377 °C while maintaining high NO2 production (71%). The outstanding performance of LaAl0.25Co0.75O3 is associated with the high mobility of lattice oxygen species and the role of surface adsorbed oxygen seems not to be prominent. The strong correlation of catalytic activity with NOx-TPD profiles suggests that NOx adsorption on catalyst surface is an essential step in soot oxidation. It is also shown that higher calcination temperature promotes the crystallinity of perovskite phase and leads to the improvement in the catalytic activity. The present work indicates that the prepared perovskite catalysts are competitive with noble-metal rivals for NOx-assisted soot oxidation and outperform them in NO2 production for further NOx abatement.

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Influence of Al doping in LaCoO3 on structural, electrical and magnetic properties

Cited by 14 publications

References 44 publications

Electronic parameters in cobalt-based perovskite-type oxides as descriptors for chemocatalytic reactions

Electronic parameters in cobalt-based perovskite-type oxides as descriptors for chemocatalytic reactions

The role of defects in microwave and conventionally synthesized LaCoO3 perovskite

Co-doped LaAlO3 perovskite oxide for NOx-assisted soot oxidation

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