The nanometer rectorite-TiO2 powder was prepared with rectorite and TiCl4 as principal raw materials

and its characters were studied by XRD

TEM techniques.The results show that the average diameter of the rectorite-TiO2 powder was 17.5 nm.With the roasting temperature rising

the surface area and the pore volume declined.When the roasting temperature rised from 500 ℃ to 800 ℃

the surface area of the nanometer rectorite-TiO2 powder declined from 65.7 m2/g to 3.3 m2/g

and the pore volume declined from 0.143 0 cm3/g to 0.021 3 cm3/g.When the roasting temperature rised from 300 ℃ to 500 ℃

the pore diameter

which was at a range of middle size

did not change a lot.But when the roasting temperature rised to 800 ℃

there were some pores caved in

which was the disadvantage of the catalytic activity of nanometer rectorite-TiO2.