Preparation and Performance of Bifunctional Resin-Supported Palladium Catalyst in Hydro-Polymerization of C4 Olefins
Based on the reaction process for C4 olefins polymerization,a new kind of bifunctional acid resin(KC110,Amberlyst35)supported palladium catalyst was designed and prepared,which can simultaneously catalyze the selective hydrogenation of 1,3-butadiene by one-step reaction and the polymerization of isobutene.The properties of the bifunctional catalyst were respectively characterized by electron probe microanalysis(EPMA),N2 physisorption-desorption(BET),transmission electron microscope(TEM),and X-ray photoelectron spectroscopy(XPS).Moreover,the performance of the bifunctional catalyst in the hydro-polymerization of C4 olefins was also investigated.The results show that the palladium nanoparticles loaded on 0.10％Pd/KCll0 bifunctional catalyst with an average particle diameter of 3-10 nm were mostly distributed on the macroporous surface of resin.The acidic property and the pore structure of resin were well preserved.The hydro-polymerization of C4 olefins was performed at the reaction temperature of 25 ℃,the reaction pressure of 1.4-1.6 MPa,the mass hourly space velocity of 2.7 h-1,the molar ratio of hydrogen to 1,3-butadiene of 1.5,as a result of which 1,3-butadiene can be completely removed;the isobutene conversion rate is above 81.5％,and the selectivity of C8 in polymerization products is about 75.1％.
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