Influence of Preparation Methods of Supported Zr Oxide Catalysts for Meervein-Ponndorf-Verlay Reduction of Acetophenone
Influence of preparation method on the catalytic activity of zirconium supported on MCM-41 has been investigated for Meervein-Ponndorf-Verlay (MPV) reduction of acetophenone forming 1-phenyl ethyl alcohol (1-PEA) in liquid phase. The catalysts were prepared by three kinds of procedures. Those were a conventional impregnation method (Zr/MCM-41-imp.), the template ion exchange method (Zr-MCM-41-TIE) and a grafting method (Zr-MCM-41-graft). The specific activity of Zr-MCM-41-graft was markedly higher than that of Zr/MCM-41-imp. and Zr-MCM-41-TIE. In order to evaluate the dispersion state of zirconium cations, benzaldehyde-ammonia titration experiment was carried out. Amount of evolved benzonitrile indicates number of surface zirconium atoms. In the Zr-MCM-41-graft catalysts, higher dispersion of Zr was observed brought about high specific activity. These results strongly suggest that the intrinsic activity of one active site of Zr-MCM-41-graft was higher than that of other catalysts.
Hyungsun Kim, JianFeng Yang, Tohru Sekino, Masakazu Anpo and Soo Wohn Lee
K. Taniya et al., "Influence of Preparation Methods of Supported Zr Oxide Catalysts for Meervein-Ponndorf-Verlay Reduction of Acetophenone", Materials Science Forum, Vol. 658, pp. 420-423, 2010