Process for the preparation of an MWW zeolitic material comprising boron and titanium

A process for preparing a zeolitic material having an MWW framework structure and comprising boron and titanium, the process comprising

• (i) providing an aqueous synthesis mixture comprising a silica source, a boron source, a titanium source, and an MWW templating agent, at a temperature of at most 50° C.;
• (ii) heating the aqueous synthesis mixture from the temperature of at most 50° C. to a temperature in the range of from 160 to 190° C. within a time period of at most 24 h;
• (iii) subjecting the aqueous synthesis mixture obtained in (ii) to hydrothermal synthesis conditions under autogenous pressure in a closed system at a temperature in the range of from 160 to 190° C., thereby obtaining, in a mother liquor, a precursor of the zeolitic material having an MWW framework structure and comprising boron and titanium;
• (iv) separating the precursor of the zeolitic material having an MWW framework structure and comprising boron and titanium from the mother liquor;
• and
• (v) calcining the separated precursor of the zeolitic material having an MWW framework structure and comprising boron and titanium obtained in (iv), thereby obtaining the zeolitic material having an MWW framework structure and comprising boron and titanium;
• wherein neither prior to nor during (iv), the precursor of the zeolitic material having an MWW framework structure and comprising boron and titanium is treated with an aqueous solution having a pH of at most 6, as determined by a pH-sensitive glass electrode.