Study On The Preparation And Application Of Hybrid Materia Poly(Ionic Liquid)s- Mesoporous Silica

Recently, interesting in Au catalysts has grown exponentially since they have been applied to a variety of reactions. And the small patical size of Au nanoparticals has been considered as one of the crucial criteria for their high catalytic activities. The catalytic activities of Au nanopaticals will reduce for the thermodynamically agglomeration. For now, to precent the agglomeration of small Au nanopaticals, An nanoparticals are stabilized on solid support. While the interaction between Au nanoparticals and support also will alter the catalytic performance of Au nanoparticals. The strong interaction between the support and the Au nanoparticals will stabilize their active surface. To make hybrid materials of designable ionic liquids and inorganic material with special functions has attracted researchers’interes.(1) Synthesis of mesoporous SBA-15 Mesoporous SBA-15 was synthesized by reactions between PI23, tetramethyl benzidine and ethyl orthosilicate. The structures of the synthetic compounds were characterized by JEM-2010 at an acceleration voltage of 120 kV.(2) Synthesis of Ionic Liquid MonomerThe 1-(p-vinylbenzyl)-3-ethylimidazolium chloride ([VBMI][C1]) monomer was synthesized using 4-(chloromethyl)styrene and 1-methylimidazole. The structures of the synthetic compounds were characterized by NMR.(3) Immobilization the CTS in the surface of mesoporous materials SBA-15, then the polymer of the ionic liquid [VBMI][C1] was grafed into the surface of the SBA-15 by atom transfer radical polymerization. Transmission electron microscopy, infrared spectroscopy, small-angle X-ray characterization methods diffraction, thermal Gravimetric Analyzer and N2 adsoption isotherms were used to characterized its structure and performance.(4) [AuCl4]-ions are immobilized as counterions within the hybrid material through ionic exchange. Subsequent reduction with NaBH4 under mild conditions gave Au/p[VBMI][Cl]-SBA-15 nanohybrids. Elemental analysis showed that the gold loading on Au/p[VBMI][Cl]-SBA-15 was 2.3wt%o The catalytic performance of the Au/p[VBMI][Cl] nanohybrids was tesed in the oxidation of silanes with water.