Patent ID: 7253135

Claim:
A process for preparing a silicon-containing alumina support comprising: mixing and/or kneading aluminum hydroxide, while adding a nanometer silicon compound; adding a peptizing acid and mixing all the materials to form a plastic mass; moulding the mass, drying it and calcining it, so as to provide a silicon-containing alumina support, the nanometer silicon compound being added in such an amount that the alumina support contains 0.5 to 40.0 weight percent of silica; wherein the nanometer silicon compound is nanometer silica with a particle diameter of 6-100 nm; the aluminum hydroxide comprises large-pore aluminum hydroxide and a small-pore aluminum hydroxide; the large-pore aluminum hydroxide has a pore volume of 0.7 to 1.1 ml/g, an average pore size of 6 to 11 nm, and a specific surface area of 300 to 380 m 2 /g; the small-pore aluminum hydroxide has a pore volume of 0.2 to 0.6 ml/g, an average pore size of 2 to 10 nm, and a specific surface area of 200 to 300 m 2 /g; the mixing ratio by weight of the large-pore aluminum hydroxide to the small-pore aluminum hydroxide is 1:1 to 1:5.