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Issue 14, 2002
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Cu1−xCoxFe2O4 ferrospinels in alkylation: Structural changes upon reaction

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Abstract

A series of Cu1−xCoxFe2O4 (x = 0, 0.25, 0.5, 0.75, 1.0) ferrospinels has been studied in the gas phase alkylation of phenol. The reaction conditions were optimized to give a maximum yield of 2,6-xylenol over o-cresol. Fresh and spent catalysts were characterized by XRD, Mössbauer spectroscopy, TPR and TPD, TG and DTA methods. Various structural changes were observed due to exposure of the fresh catalysts to the reaction mixture. Namely, phase separation to CuO and magnetite in the x = 0 and 0.25 samples, various extents of reduction (changing monotonically with the copper content, and resulting in partial reduction and redistribution of iron in tetrahedral (A) and octahedral [B] sites) and extended formation of carbonaceous deposits are detected. In spite of these profound changes the catalytic activity is maintained with only a slight decrease during extended time-on stream (40 h).

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Publication details

The article was received on 06 Feb 2002, accepted on 17 May 2002 and first published on 11 Jun 2002


Article type: Paper
DOI: 10.1039/B201299E
Citation: Phys. Chem. Chem. Phys., 2002,4, 3530-3536
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    Cu1−xCoxFe2O4 ferrospinels in alkylation: Structural changes upon reaction

    K. Lázár, T. Mathew, Z. Koppány, J. Megyeri, V. Samuel, S. P. Mirajkar, B. S. Rao and L. Guczi, Phys. Chem. Chem. Phys., 2002, 4, 3530
    DOI: 10.1039/B201299E

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