| 摘要 |
Die-formed articles based on pyrogenic titanium dioxide having the following physical-chemical data:… … external diameter 2 to 15 mm BET surface area according to DIN 66 131 35 to 65 m<2>/g pore volume 0.3 to 0.8 m<3>/g breaking strength 40 to 300 N pore distribution no pores of <10 nm diameter, at least 80 % of the pores in the range from 10 to 70 nm diameter composition at least 94 % by weight of TiO2 (predominantly, i.e. >50 % by weight of anatase), the remainder being SiO2 and Al2O3, … are produced by mixing and compacting pyrogenic titanium dioxide with a pore former such as, for example, urea and with water, if appropriate additionally with a binder such as, for example, kaolin and, if appropriate, with a tabletting aid such as, for example, wax, drying the resulting mass at a temperature from 80 to 120 DEG C and comminuting it to give a powder, pressing the powder by means of a known device to give die-formed articles and heat-treating these at a temperature from 400 to 600 DEG C for a period of 0.5 to 4.5 hours. …<??>The die-formed articles are used as a catalyst support or catalyst. |
