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Synthesis of pillared clays with Al13-Fe and Al13-Fe-Ce polymers in solid state assisted by microwave and ultrasound: Characterization and catalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
42583 45932 2009 9 PDF Available
Title
Synthesis of pillared clays with Al13-Fe and Al13-Fe-Ce polymers in solid state assisted by microwave and ultrasound: Characterization and catalytic activity
Abstract

A new methodology for the synthesis of pillared clays with the Al13-Fe and Al13-Fe-Ce polymers in solid state was developed by using microwaves and ultrasound in the aging of the olygomeric solution, in the precipitation of the corresponding sulphates, and in the intercalation of the polymer with the powdered clay. This methodology reduces significantly the water consumption in the intercalation process, and the time for the synthesis of both the polymer in the solid state, and the pillared clay. The resulting polymers were characterized by XRF, XPS, XRD and SEM. The XRF analysis showed that a high percentage of Fe and Ce associated to Al13-Fe and Al13-Fe-Ce sulphates, was dissociated during the exchange process with nitrate. Using XPS analyses we established the presence of Ce (III) in the polymers. By means of XRD and SEM we determined that Al13 and Al13-Fe sulphates present a monoclinical structure, whereas the Al13-Fe-Ce sulphates present two crystalline phases, monoclinical and cubical, whose cell parameters are slightly different from those of the sulphates reported in literature. The XRD, XRF and sortometry analyses showed that the pillared clays (synthesized with the proposed methodology), show more intense and remarkably homogenous pillaring signals, and also better textural properties than the clays pillared by the conventional method of synthesis. The catalytic activity was assessed in the phenol oxidation in dilute aqueous medium at 25 °C and at atmospheric pressure. The solids synthesized showed similar catalytic properties than those reported for the solids synthesized by the conventional method.

Graphical abstractPillared clays with the Al13-Fe and Al13-Fe-Ce polymers in solid state were synthesized by using microwaves and ultrasound in the aging of the olygomeric solution, precipitation of sulphates, and intercalation of the polymer with the powdered clay. This methodology improves the pillaring process regarding the conventional method of synthesis. The pillared clays present catalytic activity similar than the solids synthesized by the conventional method.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Pillared clays; Microwaves; Ultrasound; Keggin
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Synthesis of pillared clays with Al13-Fe and Al13-Fe-Ce polymers in solid state assisted by microwave and ultrasound: Characterization and catalytic activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 370, Issues 1–2, 30 November 2009, Pages 7–15
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