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Title: Synthesis, characterization and catalytic activity of quadruple perovskite: CaCu3-xMnxTi4-xMnxO12 (x=0, 0.5 and 1.0)
Authors: Pal K.
Dey A.
Ray P.P.
Mordvinova N.E.
Lebedev O.I.
Mandal, Tapas Kumar
Seikh M.M.
Gayen A.
Published in: ChemistrySelect
Abstract: We report the low temperature synthesis of nanosized CaCu3-xMnxTi4-xMnxO12 (x= 0, 0.5 and 1.0) quadruple perovskites and their magnetic, dielectric and catalytic performance towards CO oxidation and methanol steam reforming (MSR). Our investigations reveal the pronounced effects of particle size and chemical substitution on all the physical properties reported here. The manganese doped samples exhibit remarkable change in magnetic properties, where antiferromagnetic pristine phase converted to ferrimagnetic phase for x=1. The dielectric constant values of the cold-pressed nanosized perovskites are ~103 and follows Maxwell-Wagner type relaxation. This value is about 100 fold lower than that of the bulk samples that has been ascribed to the effect of particle size and the absence of nano-twinning in the material as revealed from HRTEM studies. The doping of manganese further reduces the magnitude of dielectric value, which is the chemical effect. Mndoped samples show greater catalytic activity compared to the pristine sample towards CO oxidation due to a synergistic Cu-Mn interaction. The catalytic performance of these oxides for MSR reaction is intriguing. Although the catalyst undergoes decomposition in the MSR atmosphere causing a decrease in methanol conversion during time-on-stream (TOS) tests, the activity can be regenerated by in-situ or ex-situ annealing in air. The notable catalytic activity and reversibility between pristine and decomposed form are very interesting. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Citation: ChemistrySelect (2018), 3(4): 1076-1087
Issue Date: 2018
Publisher: Wiley-Blackwell
Keywords: Catalytic activity
CO oxidation and methanol steam reforming (MSR)
Dielectric constant
Ferrimagnetic and antiferromagnetic
Quadruple perovskites
ISSN: 23656549
Author Scopus IDs: 57200801520
Author Affiliations: Pal, K., Department of Chemistry, Jadavpur University, Kolkata, 700032, India
Dey, A., Department of Physics, Jadavpur University, Kolkata, 700032, India
Ray, P.P., Department of Physics, Jadavpur University, Kolkata, 700032, India
Mordvinova, N.E., Laboratoire CRISMAT, UMR 6508, CNRS-ENSICAEN, Caen, 14050, France
Lebedev, O.I., Laboratoire CRISMAT, UMR 6508, CNRS-ENSICAEN, Caen, 14050, France
Mandal, T.K., Department of Chemistry Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Seikh, M.M., Department of Chemistry, Visva-Bharati University, Santiniketan, West Bengal 731235, India
Gayen, A., Department of Chemistry, Jadavpur University, Kolkata, 700032, India
Funding Details: Financial supports from the Science and Engineer Research Board (SERB), Government of India, by a grant (EMR/2016/001811) to A. Gayen and a grant (EMR/2016/000083) to Md. M. Seikh are gratefully acknowledged. UGC research fellowship to KP and DST Special Grant to the Department of Chemistry, Jadavpur University in the International Year of Chemistry 2011 are also highly acknowledged.
Corresponding Author: Gayen, A.; Department of Chemistry, Jadavpur UniversityIndia; email:
Appears in Collections:Journal Publications [CY]

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