Surface reduction in low-temperature formation of nickel oxide from different nickel salts. Thermal analysis, surface area, electron microscopy and infrared studies

Article

Pease, Wayne R., Segall, Robert L., Smart, Roger St. C. and Turner, Peter S.. 1986. "Surface reduction in low-temperature formation of nickel oxide from different nickel salts. Thermal analysis, surface area, electron microscopy and infrared studies." Journal of the Chemical Society, Faraday Transactions I: Physical Chemistry in Condensed Phases. 82 (3), pp. 747-758. https://doi.org/10.1039/F19868200747
Article Title

Surface reduction in low-temperature formation of nickel oxide from different nickel salts. Thermal analysis, surface area, electron microscopy and infrared studies

ERA Journal ID1219
Article CategoryArticle
AuthorsPease, Wayne R. (Author), Segall, Robert L. (Author), Smart, Roger St. C. (Author) and Turner, Peter S. (Author)
Journal TitleJournal of the Chemical Society, Faraday Transactions I: Physical Chemistry in Condensed Phases
Physical Chemistry Chemical Physics
Journal Citation82 (3), pp. 747-758
Number of Pages12
Year1986
PublisherThe Royal Society of Chemistry
Place of PublicationCambridge, United Kingdom
ISSN1463-9076
1463-9084
Digital Object Identifier (DOI)https://doi.org/10.1039/F19868200747
Web Address (URL)http://www.rsc.org/publishing/journals/article.asp?doi=F19868200747
Abstract

The influence of source material, decomposition and annealing temperatures on the reactivity of nickel oxide surfaces has been studied. The process of thermal decomposition in air of four nickel salts (acetate, oxalate, carbonate and hydroxide) was followed using thermogravimetric and differential thermal analysis, differential scanning calorimetry, B.E.T. surface area determination and infrared spectroscopy. Nickel acetate and oxalate gave products consisting of nickel metal and nickel oxide. The reduction mechanisms are described. The carbonate and hydroxide gave only nickel oxide, but the martensitic decomposition of the carbonate (Ht= 28.8 kJ mol–1) is considerably more energetic than that of the hydroxide (Ht= 2.8 kJ mol–1). The loss of surface area in the decomposition is correspondingly larger for the carbonate. Infrared studies of the degassing process from 25–500 °C in vacuo produced evidence for reduction on the ex-carbonate NiO surface which correlated with reactivity in dissolution kinetics studies. An absorption at 2193 cm–1 was observed, with maximum intensity after 300 °C decomposition, assigned to an Ni(O—C—O)– species resulting from CO interaction with surface O–ions. Other carbonate and hydroxyl surface groups were characterised for each oxide at different decomposition temperatures.

Keywordssurface reduction; infra red; dissolution studies; kinetics; thermal analysis
ANZSRC Field of Research 2020340603. Colloid and surface chemistry
340399. Macromolecular and materials chemistry not elsewhere classified
340601. Catalysis and mechanisms of reactions
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Byline AffiliationsGriffith University
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