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

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چکیده

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

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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 cyclopenten...

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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 TiMCM-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...

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immobilized vanadium compounds within nanoreactors of al-mcm-41 as catalyst for epoxidation of alkenes

vo2+ and its complexes with ethylenediamine (en), acetylacetonate (acac), 2, 2’-bipyridine(bpy) ligands, immobilized within nanoreactors of al-mcm-41 designated as vo2+/al-mcm-41 or vol2/al-mcm-41, were prepared and characterized by x-ray powder diffraction (xrd), ft-ir, bet nitrogen adsorption-desorption and chemical analysis techniques. vo2+/al-mcm-41 and vol2/al-mcm-41 were found to catalyze...

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عنوان ژورنال:
journal of sciences islamic republic of iran

جلد ۱۵، شماره ۴، صفحات ۰-۰

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