Abstract
Organic NH 2 group was grafted onto the surface of mesoporous molecular sieves by reacting 3-aminopropyltriethoxysilane or 3-ethyldiaminopropyltrimethoxysilane with calcined pure siliceous HMS with different pore sizes. Characterization of functionalized samples was made by means of XRD, FT-IR and N 2 adsorption-desorption isotherms. These NH 2 -grafted HMS materials are highly active catalysts for Knoevenagel reaction of benzaldehyde with ethyl cyanoacetate. The initial activity of catalyst depends not only on the density of NH 2 groups, but also on the pore size and the size of organosilane molecule. In addition, the effect of reaction temperature and solvent on the activity, and the recycling of the catalyst are also investigated.
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