Preparation Of New Catalysts In The Epoxidation Of Olefin Using The Layered Precursor

The aim of the present work is to invent an effective catalysts which can be used in the epoxidation of olefin. Vanadate, molybdate and tungstate are considered as active parts and have been successfully intercalated into Layered Double Hydroxides (LDHs) subsequently in the form of POMs to obtain the catalysts layered precursor, the resulting structure and the intercalated material have been studied by X-ray diffraction (XRD), FT-IR. The results showed that the V₁₀O₂₈^6-, Mo₇O₂₄^6- and P₂W₁₈O₆₂⁶ anion have intercalated within the LDHs interlayer without modifying its original structure.We also investigated the synthesis method and the structure of the catalysts precursor. We found out that the catalysts precursor can be obtained through ion exchange method. MgAI-NO₃-LDHs, ZnAl-NO₃-LDHS can separately be used as effective substrate, at the same time, the influence of the Mg(or Zn) and Al synthetic compound with different molar ration in the substrate are checked, and the higher electronic density can help to form the crystal catalysts precursor.After calcination, the active part of the intercalated compounds containing catalysts were tested by epoxy reaction of hexane. The results of the reactions showed that the three series catalysts are all in good effect to the epoxidation of hexane. The best catalysts are chosen based on the results of the reactions, and it turned out to be that the compounds calcined at temperature under 500°C lead to the best synthetical performance.