A boric oxide-silicon dioxide mixed oxide

摘要

Boron oxide-silicon dioxide mixed oxide has a BET surface area of less than 100 (pref. 10-80, esp. 25-50)m<2>/g. Production of the mixed oxide comprises vaporising (organo) silicone halides with a vaporisable boron compound, mixing the vapours with a carrier gas in a mixer, pref. in a burner with H2 and air and opt. with further gases e.g. oxygen and nitrogen, reacting the gases in a flame, cooling the hot gases and the solid, and opt. removing halide or raw material residues on the product by heat treating with moist air.