A new titanosilicate, named Del-Ti-MWW, has been prepared by delaminating the lamellar precursor of
Ti-MWW, which is postsynthesized from highly deboronated MWW zeolite with the assistance of cyclic
amine. The amount of organic base used for supporting surfactant in swelling the layered structure should be
controlled carefully to delaminate efficiently without the collapse of the structure. Ultrasound treatment is
demonstrated to delaminate the swollen material more completely. Del-Ti-MWW materials have a large surface
area, which mitigates effectively the steric restrictions imposed by conventional microporous titanosilicates
to bulky molecules. Del-Ti-MWW, maintaining the fundamental structure of MWW zeolite and tetrahedral
Ti species in the framework position, proves to be superior to TS-1, Ti-Beta, three-dimensional Ti-MWW
and even mesoporous Ti-MCM-41 in the epoxidation of a wide range of bulky alkenes with hydrogen peroxide.
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