METHOD FOR PREPARING THE TITANOSILICATE FORM OF MWW ZEOLITE USING A PURE SILICA MWW MATERIAL AS A PRECURSOR, AND THE USE THEREOF

摘要

The invention relates to a method for the synthesis of the metalosilicate form of MWW zeolite, comprising at least the following steps: i) preparation of the pure silica MWW precursor by heating a mixture comprising at least one organic compound that acts as an organic structure-directing agent (OSDA), and at least one source of silicone and water, among other compounds that may be required (such as fluoride anions), followed by the recovery of the resulting crystalline solid and the calcination thereof in order to eliminate the organic compound remains; ii) preparation of the MWW metalosilicate by heating the pure silica precursor produced in the first step together with at least one source of the metal (M), water, and at least one organic molecule (organic structure-directing agent, OSDA) normally used in the typical preparation of MWW materials, M being selected from at least one element of groups 3 to 14 of period 4 or higher of the periodic table; and iii) recovery and calcination of the material produced in i).