Please use this identifier to cite or link to this item:
Type: Artigo de periódico
Title: Synthesis And Characterization Of Niobium Modified Montmorillonite And Its Use In The Acid-catalyzed Synthesis Of β-hydroxyethers
Author: Gallo J.M.R.
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 β-hydroxyethers. The reaction with ion-exchanged montmorillonite (Nb-Mont) was four times faster at 60 °C and three times faster under reflux than the one using the original clay. This proves the increase of Brønsted acidity when polyhydroxyniobium is present. The Nb-Mont was also calcined at 300, 500 and 900 °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 °C. © 2006 Elsevier B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/j.apcata.2006.06.019
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File Description SizeFormat 
2-s2.0-33747150767.pdf171.82 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.