화학공학소재연구정보센터
Journal of Colloid and Interface Science, Vol.230, No.2, 320-327, 2000
Characterization of titania/silica gel by means of low-pressure nitrogen adsorption
Adsorbents synthesized by grafting of titania onto mesoporous silica gel surfaces at different temperatures were studied by means of nitrogen adsorption-desorption and water desorption. The pore size distribution f(R-p) of titania/silica gel depends on the titania concentration (C-TiO2) and the temperature of titania synthesis. Nonuniformity of TiO2 phase is maximal at a low C-TiO2 value (3.2 wt.% anatase deposited at 473 K), and two peaks of the fractal dimension distribution f(D) are observed at such a concentration of titania, but at larger C-TiO2 values, only one f(D) peak is seen. More ordered filling of pores and adsorption sites by nitrogen, reflecting in the shape of adsorption energy distributions f(E) at different pressures of adsorbate, is observed for adsorbent with titania (rutile + anatase) grafted on silica gel at a higher temperature (673 K).