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Acidity characterization of pillared clays through microcalorimetric measurements and catalytic ethylbenzene test reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
43451 45970 2007 7 PDF Available
Title
Acidity characterization of pillared clays through microcalorimetric measurements and catalytic ethylbenzene test reaction
Abstract

The catalytic disproportionation of ethylbenzene, a test reaction that was proposed in the literature for the characterization of the acidity of zeolitic materials, was used for the evaluation of the surface acidity of pillared clays. The catalytic behaviour was correlated with the results of the surface acidity characterization made by adsorption microcalorimetry of aromatic molecules and pyridine. The aromatic probe molecules used were a reactant and a product of the catalytic reaction: ethylbenzene and meta-diethylbenzene, respectively. In this way, only the accessible and strongest acid sites are titrated. The heats of adsorption of these molecules indicate that a zirconium oxide pillared clay has stronger acidity than an aluminium oxide pillared clay whereas pyridine results are equal for both samples. The difference in surface acidity, assessed by ethylbenzene and meta-diethylbenzene, correlates well with the initial catalytic activity of the materials which is higher in the zirconium sample than in the aluminium sample. These observations show that both methodologies, that is, the catalytic test reaction and the adsorption microcalorimetry of selected aromatic molecules, are useful for the surface acidity characterization of pillared clays.

Graphical abstractThe catalytic disproportionation of ethylbenzene as test reaction and adsorption microcalorimetry of a reactant and a product as probe molecules were used to characterize the surface acidity of two pillared clays: Al- and Zr-PILC. Both acidity and catalytic activity are higher for the zirconium sample. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Pillared clays; Acidity; Microcalorimetry; Catalytic ethylbenzene transformation
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Acidity characterization of pillared clays through microcalorimetric measurements and catalytic ethylbenzene test reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 330, 10 October 2007, Pages 89–95
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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