NDLI: Synthesis, characterization and catalytic evaluation of zirconia-pillared bentonite for 1,3-dioxalane synthesis

Content Provider	Springer Nature Link
Author	Mnasri, S. Frini Srasra, N.
Copyright Year	2013
Abstract	The aim of this work is to study the solids obtained by pillaring Tunisian bentonite with zirconium polycations from the hydrolysis of zirconium tetrachloride. For comparative purposes, the pillaring of Wyoming montmorillonite, a reference clay, is also studied. Variations in the dialysis number, concentration of Zr solution, pH, temperature in the synthesis procedure as well as the pillaring method, affect the structure and properties of the pillared clay obtained. It has been verified that the structure of the pillared clays strongly depends on the method of preparation and the pH Zr solution in some cases, well ordered pillared clays (with basal spacings between 15 and 18.2 A) have been obtained, while in several others noncrystalline solids yielded. Delamination of the clays seems to take place both when the intercalation solutions obtained from zirconium tetrachloride have pH > 2.8 and when they are subjected to a reflux treatment. Best results were obtained at pH = 2.8 [Zr$^{4+}$] = 0.1 M, at room temperature, and when using five dialysis, the direct method. The specific total surface area and micropore volume of the solids have reached the values up to 200 m$^{2}$ g$^{−1}$ and 0.06 cm$^{3}$ g$^{−1}$, respectively. Potentiometric titration and mass titration data suggest that pillared materials produce a shift of the point zero charge toward the point zero charge of the zirconium oxide. The amount of ZrO$_{2}$ fixed have varied between 6 and 30% of the weight of the pillared samples. The activity of the zirconium pillared clay for 1,3-dioxolane synthesis has been investigated. The method of intercalation has been found to be the most suitable for this reaction.
Starting Page	336
Ending Page	347
Page Count	12
File Format	PDF
ISSN	10683755
Journal	Surface Engineering and Applied Electrochemistry
Volume Number	49
Issue Number	4
e-ISSN	19348002
Language	English
Publisher	Springer US
Publisher Date	2013-09-03
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Zr-oligomer pillared clay point of zero charge 1,3-dioxolane acetalization Manufacturing, Machines, Tools
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Surfaces, Coatings and Films Surfaces and Interfaces

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