Issue 8, 2005
From the journal:

Physical Chemistry Chemical Physics

2,6-Dimethylpyridine as a probe of the strength of Brønsted acid sites: study on zeolites. Application to alumina

Laetitia Oliviero,a   Alexandre Vimont,*a   Jean-Claude Lavalley,a   Francisca Romero Sarria,a   Marina Gaillarda  and  Françoise Maugéa  

* Corresponding authors

a Laboratoire Catalyse et Spectrochimie, UMR CNRS – ENSICAEN – University of Caen, 6 Bd du Maréchal Juin, Caen Cedex, France
E-mail: alexandre.vimont@ensicaen.fr
Fax: +332 3145 2822
Tel: +332 3145 2732

Abstract

The positions of ν8a and ν*(NH) bands in the spectrum of protonated 2,6-dimethylpyridine vary with the strength of Brønsted acidity: the higher the ν*(NH) wavenumber and the lower the ν8a wavenumber, the stronger the acidity. The results obtained with 2,6-dimethylpyridine adsorption correlate with those obtained by CO adsorption experiments on a series of faujasite zeolites (LiHNaY, KHNaY, HY, HYSA, HNaX). These relations were extended to γ-Al2O3 having weak Brønsted acidity, not detected by pyridine and hardly detected by CO. The number (0.1 per nm2) and the strength (corresponding to Δν(OH) by CO = 155 cm−1) of the most acidic OH groups of Al2O3, as well as the position of the corresponding ν(OH) band (<3700 cm−1) are deduced from 2,6-dimethylpyridine adsorption experiments.

Graphical abstract: 2,6-Dimethylpyridine as a probe of the strength of Brønsted acid sites: study on zeolites. Application to alumina

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Article information

DOI
https://doi.org/10.1039/B500689A
Article type
Paper
Submitted
17 Jan 2005
Accepted
24 Feb 2005
First published
15 Mar 2005

Phys. Chem. Chem. Phys., 2005,7, 1861-1869

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2,6-Dimethylpyridine as a probe of the strength of Brønsted acid sites: study on zeolites. Application to alumina

L. Oliviero, A. Vimont, J. Lavalley, F. Romero Sarria, M. Gaillard and F. Maugé, Phys. Chem. Chem. Phys., 2005, 7, 1861 DOI: 10.1039/B500689A

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