Use of ionic liquids in recycle of palladium catalysts for synthesis of polyketone |
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| Authors: | TIAN Jing GUO Jintang ZHANG Xuemei ZHANG Xin XU Yongshen |
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| Institution: | School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China |
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| Abstract: | Room temperature ionic liquids as solvents for palladium-catalyzed copolymerization of carbon monoxide and styrene were prepared by reaction of aqueous lead tetrafluoroborate with correspond-ing chloride or bromide salts. The recyclability of palladium composite catalyst in various ionic liquids was investigated.Pd(bipy)2]BF4]2 showed a lower catalytic activity than Pd(bipy)2]PF6]2 in similar conditions, although the catalytic activity of each composite catalyst in ionic liquids still existed after 4 successive recycles. It was shown the catalytic activity of palladium composite catalyst was higher than that of the catalyst formed in situ from palladium acetate, 2,2'-bipyridyl, and HA (A=PF6-, BF4-) in ionic liquids. The effects of volume of ionic liquids, reaction time, and the dosage of benzoquinone on the copolymerization were also studied. |
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| Keywords: | ionic liquids catalytic activity palladium composite catalyst polyketone |
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