Evidence for modification of nickel oxide by silica. Infrared, electron microscope and dissolution rate studies

Pease, Wayne and Segall, Robert L. and Smart, Roger St. C. and Turner, Peter S. (1980) Evidence for modification of nickel oxide by silica. Infrared, electron microscope and dissolution rate studies. Journal of the Chemical Society, Faraday Transactions I: Physical Chemistry in Condensed Phases, 76. pp. 1510-1519. ISSN 0300-9599

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Abstract

Infrared spectroscopic evidence for marked interaction between nickel oxide and silica at temperatures as low as 550°C is described. An infrared absorption at approximately 1045 cm–1 can be attributed to silicon atoms in the nickel oxide lattice. This is observed in both annealed nickel oxide + silica mixtures and nickel oxide heated in silica tubes. Electron microscopy shows that the nickel oxide particles (with incorporated silicon) are single phase. The silicon content produces a surface morphology which becomes predominantly {111}. Dissolution rates per unit surface area in dilute acid are decreased more than one hundred times by the interaction, even with < 10–3 mol % silicon in nickel oxide. The slower dissolution is found throughout dissolution. The silicon atoms apparently enter the tetrahedral interstices in the oxygen lattice, effectively producing SiO4 groups. The work shows that adsorption and catalytic studies of nickel oxide surfaces are markedly affected by the presence of silica even for samples pretreated at relatively low temperature.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: 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 04:33
Last Modified: 02 Nov 2010 01:19
Uncontrolled Keywords: dissolution, nickel oxide, Silica, infra red,
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) > 030606 Structural Chemistry and Spectroscopy
03 Chemical Sciences > 0306 Physical Chemistry (incl. Structural) > 030601 Catalysis and Mechanisms of Reactions
Identification Number or DOI: doi: 10.1039/F19807601510
URI: http://eprints.usq.edu.au/id/eprint/3522

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