Abstract
The template ion-exchange (TIE) method, developed by us for post synthesis of metal ion-planted MCM-41, has been expanded to various metal ions. No collapse of the mesoporous structure of MCM-41 was observed after the TIE treatment. The cations of Al, Ti, Cr, Mn, Zn, or Zr could be incorporated in MCM-41 with high dispersion, while Fe, Co, Ni, Cu, Ga, Pd, or Pt formed nano-scale particles on the outside of the MCM-41 particles. The reaction mechanism of TIE was studied during the loading of manganese ion. It follows that the exchange between the template ion and proton first proceeds and then the proton exchanges with metal cation. Ti-MCM- 41 was the most active among the metal ion-planted MCM-41 for catalytic asymmetric oxidation of sulphide with hydrogen peroxide in the presence of optically active tartaric acid in dichloromethane.
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