A novel one-step synthesis of mesostructured silica-pillared clay with highly ordered gallery organic-inorganic hybrid frame |
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Authors: | Huihui Mao Xiaoxin GaoJihe Yang Baoshan Li |
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Institution: | a Department of Chemical Engineering, Changzhou University, Changzhou, Jiangsu Province 213164, PR China b State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, No. 15, Beisanhuan East Road, Beijing 100029, PR China |
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Abstract: | A new class of organic-inorganic hybrid mesostructured silica-pillared clay (HSPC) has been prepared through the surfactant directed assembly of organosilica in the galleries of montmorillonite. The surfactant templates were removed from the pores by solvent-extraction. The products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), nitrogen adsorption-desorption measurements, solid-state 29Si and 13C NMR, and Fourier-transform infrared (FT-IR) spectra. XRD patterns indicated a regular interstratifications of the clay layers for HSPCs. Depending on loading of phenyl groups, HSPCs had BET surface areas of 395-602 m2 g−1, pore volumes of 0.34-0.79 cm3g−1, and the framework pore sizes in the supermicropore to small mesopore range (1.3-2.6 nm). HSPCs were hydrophobic and acidic. The number of silanol groups on the surface of HSPC materials has been titrated by a surface reaction with hexamethyldisilazane, followed by quantification of the liberated NH3. Based on this method extracted HPCHs have high silanol numbers, a very important feature with respect to the amount of catalytic sites that can eventually be grafted onto the surface. |
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Keywords: | Organic-inorganic hybrid Silica-pillared clay Montmorillonite Solvent-extraction Surface |
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