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

Pease, Wayne R. and Segall, Robert L. and 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. ISSN 0300-9599

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Awaiting paper from Publisher or author. Permission received from Publisher to deposit Published version 11/2/2008. Awaiting paper (Published or Author version) from author.
Depositing User: Mr Wayne Pease
Faculty / Department / School: Historic - Faculty of Business - Department of Information Systems
Date Deposited: 11 Feb 2008 04:27
Last Modified: 28 Oct 2013 06:49
Uncontrolled Keywords: surface reduction; infra red; dissolution studies; kinetics; thermal analysis
Fields of Research (FOR2008): 03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030603 Colloid and Surface Chemistry
03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030606 Structural Chemistry and Spectroscopy
03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030601 Catalysis and Mechanisms of Reactions
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Identification Number or DOI: doi: 10.1039/F19868200747
URI: http://eprints.usq.edu.au/id/eprint/3523

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