Silicon-containing alumina support, a process for preparing the support and a catalyst containing the support

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 m2/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 m2/g;
• the mixing ratio by weight of the large-pore aluminum hydroxide to the small-pore aluminum hydroxide is 1:1 to 1:5.