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Issue 17, 2002
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Acid–base properties of Cu1−xCoxFe2O4 ferrospinels: FTIR investigations

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Abstract

Systematic IR spectroscopic studies were undertaken to investigate the acid–base properties of Cu–Co ferrospinels Cu1−xCoxFe2O4 (x = 0 to 1) employed in phenol methylation to produce 2,6-xylenol. The IR spectra of the ferrospinels reveal that Fe3+ and Co2+ ions are mainly responsible for the various hydroxy groups on the surface. Temperature dependent IR studies of pyridine adsorbed on spinels and on the spinel phase with deliberately added metal oxide exemplify the contribution of the metal ions and their coordination state towards Lewis acidity. IR studies of the spinel surface with adsorbed CO2 and adsorption studies of electron acceptors such as 7,7,8,8-tetracyanoquinodimethane, 2,3,5,6-tetrachloro-1-4-benzoquinone and p-dinitrobenzene were carried out to evaluate the nature of the basic sites and the strength and distribution of the electron donor sites present on the spinel surface. It was found that the acidity (basicity) of the Cu1−xCoxFe2O4 spinel system increases (decreases) from x = 0 to 1. A correlation between acidity, basicity and catalytic performance reveals that an intermediate acid–base character enhances the phenol methylation activity.

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Publication details

The article was received on 02 May 2002, accepted on 24 Jun 2002 and first published on 19 Aug 2002


Article type: Paper
DOI: 10.1039/B204226F
Citation: Phys. Chem. Chem. Phys., 2002,4, 4260-4267

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    Acid–base properties of Cu1−xCoxFe2O4 ferrospinels: FTIR investigations

    T. Mathew, B. B. Tope, N. R. Shiju, S. G. Hegde, B. S. Rao and C. S. Gopinath, Phys. Chem. Chem. Phys., 2002, 4, 4260
    DOI: 10.1039/B204226F

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