modified titanium content in titanosilicates mesoporous molecular sieves mcm-41 as selective catalyst for epoxidation of alkenes

ti-mcm-41 was synthesized at ph 3, 7 and 11. the titanium content was determined by aas and found to be 4%, 3.2% and 4.5%, respectively. in order to increase the titanium content in ti-mcm-41, ti(iv) ions were grafted onto ti-mcm-41 using ticl4 in toluene and ti(obu)4 in ethanol. the incorporation of ti was determined to be 28% and 30%, respectively. the oxidation of olefins such as cyclopentene, cyclohexene, norbornene and trans-2-hexene-1-ol with tbhp in the presence of ti-grafted ti-mcm-41 were carried out in chcl3. this system successfully catalized the oxidation of these olefins toward the corresponding epoxides with 60 to 90% reactivity and 95 to 100% selectivity