Preparation of TiSi mixed oxides by sol–gel one step hydrolysis

Abstract

TiSi mixed oxides of various TiO 2 contents were prepared via sol–gel one step hydrolysis with economical TiCl 4 and tetraethoxy silane (TEOS) as the precursors and characterized by means of N 2-physisortion, FT-IR and XRD. The effects of TiO 2 content on the gelation time were studied. The influences of calcination temperature on the mixed oxide of 20 wt.% TiO 2 (20TiSi) were also studied. The results indicate that titanium is in four-fold coordination with oxygen in the SiO 4 4− structure and TiOSi band is observed by FT-IR. The mixed oxides with large TiO 2 content exist on the pattern of amorphous material but not anatase. The composites have high specific surface areas, up to 681.5 m 2/g, and a narrow pore size distribution. The ratio of the micropore declines with the increase of TiO 2 content. 20TiSi has good thermal stability and still possesses 11 m 2/g after calcination at 1100 °C. Within the range of tested calcination temperature, TiOSi band does not break. TiO 2 is well dispersed as the form of amorphous in 20TiSi calcined at 1100 °C.