Preparation method for propylene epoxidation catalyst, and application thereof

A preparation method for a propylene epoxidation catalyst, comprising the following steps:

• (1) pre-hydrolysis of silicon source:
• dissolving a silicon ester in a lower alcohol, adding a hydrolysis catalyst and water to react to obtain liquid A;
• (2) sol formation:
• dissolving a titanium ester in a lower alcohol and adding the obtained system to liquid A;
• adding water or adding a mixed aqueous solution of NH4ReO4 and a zinc salt to react to obtain a sol;
• (3) atomizing the sol obtained in step (2) and spraying the atomized sol into liquid ammonia to obtain a catalyst precursor;
• (4) carrying out a pore broadening treatment to the catalyst precursor obtained in step (3);
• (5) drying and calcining the pore broadened catalyst precursor in step (4);
• (6) carrying out a silanization treatment to the product obtained in step (5).