Catalytic Dimerization of Propene

To select good catalyst for dimerization of propene and to explore the reaction mechanism of dimerization of propene,a series of ZSM 5 zeolites modified with Zn,Zn Mg or Zn Ni were determined.The acidities of the catalysts were investigated by IR of pyridine adsorption and NH 3 TPD.The activities and selectivities for the dimerization of propene have been determined using a pulse microreactor system.The result shows that in given reaction conditions,on the impregnated catalyst Zn Mg/NH 4 ZSM 5(IM),a 94.2% conversion and 100% selectivity for dimerization are obtained.The dimerization of propene is in favour of the carbonium ion mechanism.Bronsted acid sites are the active sites.The selectivity for dimerization of propene increases as the strong Bronsted acidity decreases. conversion and 100% selectivity for dimerization are obtained.The dimerization of propene is in favour of the carbonium ion mechanism.Bronsted acid sites are the active sites.The selectivity for dimerization of propene increases as the strong Bronsted acidity decreases.