REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

Synthesis of Re/Pd heterogeneous catalysts supported on HMS using sol-gel method followed by supercritical drying with excess solvent

Dragana Prokić Vidojević

Military Technical Institute, Ratka Resanovica 1, 11030 Belgrade, Serbia, drprokic@yahoo.co.uk

Sandra B. Glišić

Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia

Aleksandar M. Orlović

Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia

Abstract: Hexagonal mesoporous silicas (HMS) have found promising applications as heterogeneous catalysts support. In this paper, HMS with Ti ions (Si/Ti atomic ratio of 40) was prepared using sol-gel method. Mesoporous texture was assembled with dodecylamine as the structure directing surfactant (S°) and TEOS and Titanium butoxide as the inorganic precursors (I°). In order to improve textural characteristics apart from the conventional air-drying, supercritical drying with excess ethanol was applied. Obtained material was used as the support for the preparation of Re/Pd heterogeneous catalysts. The Ti incorporation is conformed with the FT-IR spectroscopy and the morphology of the samples is analysed using SEM.

Keywords: Mesoporous Silica, Rhenium oxide, Ti-HMS, Sol-Gel , Supercritical drying.