Preparation using ozone treatment, characterization and application of isomorphously substituted Ti-, V- and Zr-MCM-41 catalysts

摘要

Si-, Ti-, V- and Zr-MCM-41 catalyst samples were synthesized, and two different methodswere used for removing the template from the as synthesized samples, either by the usualprocess at high tempereture in the presence of O_2, or oxidation at 150 ℃ with ozone. After thephysical characterization (X-ray diffraction, ~(29)Si MAS NMR spectroscopy, IR spectroscopy,BET method) of the samples, oxidation of cyclohexane, cyclohexene and vinyl cyclohexenewith H_2O_2 as test reactions were carried out. The catalytic activities and selectivities of thesamples are different. It has been shown that the activity and selectivity of these modifiedMCM-41 catalysts in the oxidation reactions greatly depend on the method used for removing of template.