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*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

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.

Original languageEnglish
Pages (from-to)355-365
Number of pages11
JournalReaction Kinetics, Mechanisms and Catalysis
Volume107
Issue number2
DOIs
StatePublished - Dec 2012
Externally publishedYes

Keywords

  • Nucleation
  • Oxidation
  • Oxides
  • Precipitation
  • Thermal properties

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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