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Entrained Sodium in Mixed Metal Oxide Catalysts Derived from Layered Double Hydroxides

Cross, Hannah E. and Brown, D.R. (2010) Entrained Sodium in Mixed Metal Oxide Catalysts Derived from Layered Double Hydroxides. Catalysis Communications, 12 (3). pp. 243-245. ISSN 1566-7367

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Abstract

The layered double hydroxide Mg6Al2(CO3)(OH)16.4H2O has been prepared using aqueous sodium hydroxide and sodium carbonate. Samples have been washed to varying degrees and then calcined to form the mixed oxides. Entrained sodium concentrations have been measured in all samples and compared with catalytic activities in a base-catalysed transesterification reaction, and with CO2 adsorption calorimetric data. The same materials have been prepared using routes not involving alkali metal compounds and compared in the same way. The results show that entrained sodium in these materials is difficult to remove, that it is associated with increased basicity and catalytic activity, and that, when incorporated at levels as high as 2% w/w, significant leaching can occur into reaction mixture. It seems likely that the sodium is entrained in the layered double hydroxide as sodium nitrate.

Item Type: Article
Uncontrolled Keywords: Hydrotalcite; catalysis; solid base; entrained sodium; adsorption calorimetry; layered double hydroxide; LDH
Subjects: Q Science > QD Chemistry
T Technology > TP Chemical technology
Schools: School of Applied Sciences
School of Applied Sciences > Materials and Catalysis Research Centre
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Depositing User: Sharon Beastall
Date Deposited: 22 Sep 2010 12:18
Last Modified: 11 Nov 2010 11:42
URI: http://eprints.hud.ac.uk/id/eprint/8651

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