Spherical titanium silicalite molecular sieve catalyst and preparation method therefor

A method for preparing a microspherical titanium silicalite catalyst, wherein the microspherical titanium silicalite catalyst has a composition of

• xTiO2·(1−x)SiO2/yMPO4
• wherein x=0.0005-0.04, y=0.005-0.2;
• wherein M is selected from alkaline earth metals, transition metals, or combinations of two or more thereof;
• wherein the method comprises:
• (i) providing an original titanium silicalite powder, wherein the original titanium silicalite powder has following composition:
• xTiO2·(1−x)SiO2
• wherein x=0.0005-0.04;
• (ii) mixing a silica sol, an organic template and a phosphate at a molar ratio of 1:0.02-0.2:0.01-0.5 of SiO2:organic template:phosphate to obtain a binder, wherein the phosphate is selected from alkaline earth metal phosphates, transition metal phosphates, or combinations of two or more thereof;
• (iii) mixing the binder with the original titanium silicalite powder, spray-drying and firing at a temperature range of 350-600° C. to obtain the titanium silicalite catalyst, wherein when the binder is mixed with the original titanium silicalite powder, a weight ratio of silicon dioxide in the binder to the original titanium silicalite powder is 1:2-20.