Study the Effect of Hydrophily Changing Silicate Catalytic (MCM-41) on Interaction in the Aqueous Medium

Abstract

A  silicate  catalyst prepared which has a mezopore type (MCM-41) ,by manner that condensation where the interaction between Tetra Ethyl Ortho Silicate (TEOS) with 3-Mercapto Propyl Tri-methoxy Silane (MPTS), in the presence of superficial active substance {Cetyl Trimethyl Ammonium Bromide(C₁₆ TAB)}at room temperature.The process of changing the surface hydophilic of the catalyst has done by using substance( Hexa methyl disilazane), which symbolized by the symbol (HMDS).Then  some measurements made for  catalyst, which is prepared in this research before and after changing  the hydrophilic. calibration results had shown that the number of acidic  sites equals (0,633m mol/lit), the specific surface is equal to (1500m²/gr),the graph lines belonging to the adsorption and desorption of nitrogen showed: decreasing the voleume of adsorbed nitrogen with increasing applied pressure whenever sample hydrophilic increased. {7}Then we prepared a compound  5-hydroxy methyl furfural according to the reference method, as a model for the interaction in an aqueous medium, by using catalyst which prepared in this research before and after changing its hydrophilic {12}.

Keywords: Polar silicate catalysts, Hexa methyl disilazane, hydrophilic, acidic effective sites,MCM41, 5-hydroxy methyl furfural.