Correlation between the reduction behavior of ferrospinels synthesized by a ‘soft’ chemical method and their carbon monoxide oxidation activity

C. U. Aniz; P. P. Robinson; K. K. Abdul Rashid; T. D. Radhakrishnan Nair

doi:10.1007/s11144-012-0472-y

Reaction Kinetics, Mechanisms and Catalysis

Volume/Issue:: Volume 107: Issue 2

Correlation between the reduction behavior of ferrospinels synthesized by a ‘soft’ chemical method and their carbon monoxide oxidation activity

Authors:

C. U. Aniz

C. U. Aniz School of Chemical Sciences, Kannur University, Payyanur Campus, Edat. P.O, Kannur 670327, Kerala, India
R & D Division, Sud—Chemie India Pvt Ltd., Binanipuram, Kerala, 683 502, India

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P. P. Robinson

P. P. Robinson Department of Chemistry, Christ College, Irinjalakuda, Kerala, 680 125, India

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K. K. Abdul Rashid

K. K. Abdul Rashid R & D Division, Sud—Chemie India Pvt Ltd., Binanipuram, Kerala, 683 502, India

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, and

T. D. Radhakrishnan Nair

T. D. Radhakrishnan Nair School of Chemical Sciences, Kannur University, Payyanur Campus, Edat. P.O, Kannur 670327, Kerala, India

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Pages:: 355–365

Online Publication Date:: 04 Jul 2012

Publication Date:: 01 Dec 2012

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s11144-012-0472-y

Keywords:: Oxides; Precipitation; Oxidation; Thermal properties; Nucleation

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Abstract

The kinetics of the reduction of nickel, cobalt and copper ferrites was studied by the temperature programmed reduction method at different heating rates in hydrogen atmosphere. The activation energy values of the reduction processes were calculated using the non-isothermal isoconversional method according to the Kissinger-Akahira-Sunose equation and the dependence of apparent activation energy on the degree of conversion was determined. The carbon monoxide oxidation activities of all the three samples were determined at various temperatures up to 140 °C. An interesting correlation between the apparent activation energies for the reduction process was observed. The decreasing trend of activation energy on the ‘extent of conversion’ in all cases showed that the reduction is a multi-step process involving a reversible process followed by an irreversible step.

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Reaction Kinetics, Mechanisms and Catalysis

Print ISSN:: 1878-5190

Online ISSN:: 1878-5204

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Reaction Kinetics, Mechanisms and Catalysis
Language	English
Size	B5
Year of Foundation	1974
Volumes per Year	1
Issues per Year	6
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
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Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
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ISSN	1878-5190 (Print)
ISSN	1878-5204 (Online)