Synthesis of the mixed oxide catalysts based upon the nickel-copper hydrotalcites of the type NixCu6-xCr2(OH)16(CO3)4H2O

Frost, Ray L., Martens, Wayde N., & Adebajo, Moses O. (2005) Synthesis of the mixed oxide catalysts based upon the nickel-copper hydrotalcites of the type NixCu6-xCr2(OH)16(CO3)4H2O. Journal of Thermal Analysis and Calorimetry, 81(2), pp. 351-355.

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High resolution TG coupled to a gas evolution mass spectrometer has been used to study the thermal properties of a chromium based series of Ni/Cu hydrotalcites of formulae NixCu6-xCr2(OH)16(CO3).4H2O where x varied from 6 to 0. The effect of increased Cu composition results in the increase of the endotherms and mass loss steps to higher temperatures. Evolved gas mass spectrometry shows that water is lost in a number of steps and that the interlayer carbonate anion is lost simultaneously with hydroxyl units. Differential scanning calorimetry was used to determine the heat flow steps for the thermal decomposition of the synthetic hydrotalcites. Hydrotalcites in which M2+ consist of Cu, Ni or Co form important precursors for mixed metal-oxide catalysts. The application of these mixed metal oxides is in the wet catalytic oxidation of low concentrations of retractable organics in water. Therefore, the thermal behaviour of synthetic hydrotalcites, NixCu6-xCr2(OH)16CO3.nH2O was studied by thermal analysis techniques in order to determine the correct temperatures for the synthesis of the mixed metal oxides.

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ID Code: 1982
Item Type: Journal Article
Refereed: Yes
Keywords: dehydration, dehydroxylation, hydrotalcite, differential scanning calorimetry, high, resolution thermogravimetric analysis
DOI: 10.1007/s10973-005-0791-6
ISSN: 1572-8943
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2005 Springer
Copyright Statement: The original publication is available at SpringerLink.
Deposited On: 22 Aug 2005 00:00
Last Modified: 29 Feb 2012 13:17

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