Preparation,characterization,stability and catalytic reactivity of the 3d transition metals incorporated MCM-41 molecular sieves

摘要

Mesoporous MCM-41 silica was modified by incorporation one or two of 3d transition metal ions (Ti,V,Cr,Mn,Fe,Co,Ni and Cu).The mono-and bimetallic mesoporous molecular sieves and their stability (storage under ambient condition over the course of months and under the reaction conditions) were studied by various techniques,such as:XRD,N_2 adsorption-desorption,SEM,TEM,IR spectroscopy and TGA.These modified MCM-41 materials have been shown to be active for the liquid phase oxidation of styrene and benzene with aqueous H_2O_2.It has to note that Ti,V,Cr and bimetallic (V-Ti,Cr-Ni) incorporated catalysts are particularly active both for selective oxidation of styrene and benzene,Mn,V-Ti and V-Co only active for benzene and Co,Cu and V-Cu for styrene.The catalytic results obtained with these 3d transition metals incorporated materials revealed a possible correlation between the catalytic activity and d electron configuration in the valence shell of transition metals.