Catalytic activity test of TiO2, ZrO2 and TiO2-ZrO2 mixed oxides synthesize by a sol-gel method

using 3,3-dimethylbut-1-ene as a model reaction

 

M. Abdennouri1, 2, M. Baâlala2, A. Galadi1, M. Bensitel2*, M. Elkrati2, M. Sadiq2

1 Cadi Ayyad University Graduate School of Technology EST Safi B.P 89 Safi 46000. Instrumental Techniques & Quality Control Department "Research, Analysis and Environment Control Team" (RAECT), Morocco.

 2 Chouaib Doukkali University Faculty of sciences B.P.20, 24000 El Jadida Laboratory of Catalysis

 and Corrosion of Materials, Morocco.

* Corresponding author. E-mail: medbensitel@hotmail.com

Received: 19 March 2008; revised version accepted: 05 August 2008

Abstract

   The objective of the present study is to synthesise simple metal oxides titania (TiO2), zirconia (ZrO2) and zirconia-titania mixed oxides containing 25, 75 mol % of titanium (TiO2-ZrO2). All the samples were prepared by the sol-gel processing method using titanium (IV) propoxide and zirconium (IV) propoxide, 70 wt % solution in 1-propanol as the precursor materials. All samples were calcinated at 723 K and characterized by different physico-chemical technique, XRD, FT-IR and Raman spectroscopy. The catalytic activity of these catalysts was tested by isomerization of 3,3-dimethylbut-1-ene (33DMB1). The skeletal isomerization of (33DMB1) is a relatively clean reaction with only two major products 2,3-dimethylbut-1-ene (23DMB1) and 2,3-dimethylbut-2-ene (23DMB2). Their formation requires relatively strong acid sites. The catalytic activity increases with increasing titania content.

 

Keywords: TiO2; ZrO2; TiO2-ZrO2 mixed oxides; sol-gel processes; 3,3-dimethylbut-1-ene isomerization.

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