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Type: Artigo de periódico
Title: Synthesis and characterization of niobium modified montmorillonite and its use in the acid-catalyzed synthesis of beta-hydroxyethers
Author: Gallo, JMR
Teixeira, S
Schuchardt, U
Abstract: Montmorillonite K10 was ion-exchanged with polyhydroxyniobium obtained from niobium pentachloride by hydrolysis. This modified clay was characterized by X-ray diffraction, thermogravimetric analysis, inductively coupled plasma emission (ICP-OES) and nitrogen adsorption/ desorption. The obtained material was used in the alcoholysis of epoxidized methyl oleate with methanol, leading to beta-hydroxyethers. The reaction with ion-exchanged montmorillonite (Nb-Mont) was four times faster at 60 degrees C and three times faster under reflux than the one using the original clay. This proves the increase of Bronsted acidity when polyhydroxyniobium is present. The Nb-Mont was also calcined at 300, 500 and 900 degrees C to obtain the Nb-pillared montmorillonite. However, the activity of the calcined Nb-Mont decreased with increasing calcination temperature. On the other hand, calcined montmorillonite maintained its basal distance, even after treatment at 900 degrees C. (C) 2006 Elsevier B.V. All rights reserved.
Subject: montmorillonite
polyhydroxyniobium exchanged
acid catalyst
epoxidized methyl oleate
ring-opening reaction
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.apcata.2006.06.019
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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