Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (10): 1719-1725.DOI: 10.1016/S1872-2067(15)60908-1

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Host (dealuminated Y zeolite)-guest (trinuclear metal clusters of Co, Mn and Cox/Mny) as nanocomposite catalysts for the epoxidation of cyclohexene

Maryam Moosavifara, Alieh Navid Arbata,b, Zolfaghar Rezvanic, Kamellia Nejatib   

  1. a Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran;
    b Department of Chemistry, Payame Noor University, P.O. BOX 19395-3697, Tehran, Iran;
    c Department of Chemistry, Faculty of Basic Sciences, Azarbaijan Shahid Madani University, Tabriz, Iran
  • Received:2015-04-04 Revised:2015-05-19 Online:2015-09-26 Published:2015-09-26

Abstract:

Trinuclear metal clusters of Co, Mn and mixtures of Co/Mn including [Mn3(O)(CH3COO)6-(py)3]-Y, [Co3(O)(CH3COO)6-(py)3], [Co2Mn(O)(CH3COO)6-(py)3]-Y and [CoMn2(O)(CH3COO)6-(py)3]-Y] were prepared inside the nanocage of dealuminated Y zeolite by the template synthesis method. These catalysts were characterized by Fourier transform infrared, Ultraviolet-visible, field scanning electron microscopy, X-ray diffraction and atomic absorption spectroscopy. The encapsulated metal clusters showed good catalytic activity in the epoxidation of cyclohexene with H2O2/O2. Epoxide yields were 82.5% to 90.7%. NaBr was used as a promoter for the oxidation. The homonuclear metal clusters showed higher catalytic activity than the others and the highest efficiency was with the Mn3(O)-DAZY compound. The catalytic activity order was Mn3(O)-DAZY > Co3(O)-DAZY > Mn2Co(O)-DAZY > MnCo2(O)-DAZY.

Key words: Cyclohexene, Epoxide, Metal clusters, Dealuminated Y Zeolite, Cobalt