Epoxidation catalyst and process for its preparation

A process for the production of a zeolitic material, wherein the framework structure of the zeolitic material comprises Si, O, and a tetravalent element M other than Si, wherein M is selected from the group consisting of Ti, Sn, Zr, Ge, and mixtures of two or more thereof, the process comprising:

• (1) preparing a mixture comprising one or more sources of MO2, one or more organotemplates, a first portion of one or more sources of SiO2, and a protic solvent system comprising water;
• (2) heating the mixture obtained in (1) at a temperature comprised in the range of from 30° C. to the boiling point of the mixture;
• (3) heating the mixture obtained in (2) under autogenous pressure at a temperature comprised in the range of from 100 to 250° C.;
• wherein during the course of (2), a second portion of one or more sources of SiO2 is added to the mixture.