Influence of V content on the nature and strength of acidic sites in VSibeta zeolite evidenced by IR spectroscopy

K Góra-Marek; J Datka; S Dzwigaj; M Che

doi:10.1021/jp0582890

Influence of V content on the nature and strength of acidic sites in VSibeta zeolite evidenced by IR spectroscopy

J Phys Chem B. 2006 Apr 6;110(13):6763-7. doi: 10.1021/jp0582890.

Authors

K Góra-Marek¹, J Datka, S Dzwigaj, M Che

Affiliation

¹ Faculty of Chemistry, Jagiellonian University, 30-060 Cracow, Ingardena 3, Poland Laboratoire de Réactivité de Surface, UMR 7609-CNRS.

PMID: 16570983
DOI: 10.1021/jp0582890

Abstract

VSibeta zeolites prepared by a two-step postsynthesis method have been characterized by physical techniques. A significant reduction of intensity of the IR band near 3515 cm(-1) after impregnation of dealuminated beta zeolite with aqueous NH4VO3 indicates that V ions specifically react with hydrogen-bonded SiO-H groups of vacant T sites. IR bands at 3618 and 3645 cm(-1) are assigned to SiO-H groups interacting with V and to VO-H groups, respectively. In VSibeta, diffuse reflectance UV-visible data show that below 1.9 wt % V is present as lattice tetrahedral species and at higher content as extra-lattice octahedral species (mononuclear and polynuclear). VSibeta samples are EPR-silent at 298 or 77 K suggesting that there are no paramagnetic VIV ions. IR studies show that V-OH groups are less acidic than Si-OH-Al groups of parent HAlbeta zeolite. IR results of CO adsorption evidence three kinds of Lewis acidic sites, related to lattice mononuclear and extra-lattice mononuclear and polynuclear V species. Quantitative IR studies of ammonia and pyridine adsorption reveal that only about half of V introduced into zeolite is able to form either Brønsted or Lewis acidic sites.