A kind of preparation method of olefin epoxidation catalysts and the catalyst thus prepared

The present invention relates to a kind of olefin epoxidation catalysts preparation method, including：(1) titanium Silica hydrogel is prepared；(2) expanding treatment is carried out using organic amine or liquefied ammonia to the titanium Silica hydrogel, Ti-Si composite oxide is obtained after dry, roasting；(3) the alcoholic solution processing of organic alkali metal salt is optionally carried out；(4) gas-phase silylation processing is optionally carried out.Catalyst aperture prepared by the method for the present invention has adjustable denaturation, to have the activity of higher to the olefin hydrocarbon molecules epoxidation reaction of different dynamic diameter；Two steps that catalyst carries out are modified with the surface acidity for effectively reducing catalyst, makes catalyst that there is the epoxidation product selectivity of higher.