Author/Authors :
Masteri-Farahani, M Department of Chemistry, Tarbiat Moallem University, Tehran , Sadeghi, M Department of Chemistry, Iran University of Science and Technology, Tehran , Abdollahi, Y Faculty of Chemistry, Islamic Azad University, Ardabil branch, Ardabil , Mehdi Kashani Motlagh, M Department of Chemistry, Iran University of Science and Technology, Tehran , Salimi, F Faculty of Chemistry, Islamic Azad University, Ardabil branch, Ardabil
Abstract :
Two new heterogenized epoxidation nanocatalysts based on
molybdenum and tungsten compounds were prepared with covalent
grafting of MCM-41 with 3-aminoropropyl trimethoxysilane and
subsequent reaction with diphenylphosphinobenzaldehyde and
complexation with M (Mo, W)O2(acac)2. X-ray diffraction and
nitrogen sorption analyses revealed the preservation of the textural
properties of the support as well as accessibility of the channel system
despite sequential reduction in surface area, pore volume and pore
size. Elemental analyses showed the presence of 0.15 mmol
molybdenum and 0.09 mmol tungsten per gram of the catalyst,
respectively. Epoxidation of olefins in the presence of M
(Mo,W)O2dppb@AmpMCM-41 with tert-butyl hydroperoxide
(TBHP) and hydrogen peroxide were examined. 2012 JNS All rights
Keywords :
Tungsten , Molybdenum , MCM-41 , Supported Schiff base , Epoxidation
