Adsorption and catalytic properties of CoxFe3–xO4 spinels. Part 1.—Preparation and characterisation of precursors to ammonia-synthesis catalysts
- 1 January 1985
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 81 (11) , 2577-2591
- https://doi.org/10.1039/f19858102577
Abstract
Precipitation and dehydration has produced a series of cobalt–iron oxides CoxFe3–xO4(0 ⩽x⩽ 3) whose surfaces at intermediate x show only marginal iron enrichment and which are useful precursors to ammonia synthesis catalysts. With increasing x activation energies for electrical conduction increase but surface areas estimated by adsorption of N2, H2O and n-hexane decrease (and are significantly different for three adsorbates, SHC < SN2 < SH2O , reflecting increasing surface–adsorbate specific interactions). Even for n-hexane enthalpies of adsorption are stronger than expected from mere physical adsorption.Keywords
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