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Entrained sodium in mixed metal oxide catalysts derived from layered double hydroxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
50959 46823 2010 3 PDF Available
Title
Entrained sodium in mixed metal oxide catalysts derived from layered double hydroxides
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.

Graphical AbstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch Highlights► Residual sodium in layered double hydroxides is difficult to remove. ► Calcined layered double hydroxides with entrained sodium show high basicity. ► Catalytic activity significantly is increased by entrained sodium. ► Sodium is trapped initially as sodium nitrate. ► Leaching to reaction mixture restricts use of sodium-contaminated materials.

Keywords
Hydrotalcite; Catalysis, solid base; Entrained sodium; Adsorption calorimetry; Layered double hydroxide; LDH
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Entrained sodium in mixed metal oxide catalysts derived from layered double hydroxides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 12, Issue 3, 30 November 2010, Pages 243–245
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us