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Structure and Acid Properties of Phosphate-modified MCM-49 Zeolites and Their Catalysis Performance for the Alkylation of Benzene with Propylene in Liquid

ZHANG Yu1, WANG Li-Xia2, WU Shu-Jie2, YANG Xu-Wei2, JIA Ming-Jun2*, WU Tong-Hao2, SUN Chia-Chung3   

    1. Department of Chemical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China;
    2. Department of Physical Chemistry, College of Chemistry,
    3. National Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130021, China
  • Received:2006-12-11 Revised:1900-01-01 Online:2007-09-10 Published:2007-09-10
  • Contact: JIA Ming-Jun

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Abstract: MCM-49 zeolite was synthesized hydrothermally in a 10 L autoclave by dynamic method. The phosphate-modified MCM-49 zeolites were prepared by impregnation. The resulting solids were characterized by different techniques, such as XRD, N2 adsorption-desorption, NH3-TPD, FTIR and 27Al NMR. Benzene alkylation with propylene was carried out by using MCM-49 and phosphate-loaded MCM-49 zeolite as the catalysts. Both the amounts of Bronsted and Lewis acid on phosphate-modified MCM-49 were decreased. 27Al NMR spectrum reveals that the loading of phosphate onto MCM-49 results in a increase of the amounts of extraframework aluminum, and two new signals corresponding to Al(OP)6 and Al(PO)4 can be found, respectively. Loading of phosphate onto MCM-49 greatly enhances the selectivity to IPB in benzene alkylation with propylene. The phosphate-modified MCM-49 catalyst containing 2.0%(mass fraction) phosphorus, at a reaction temperature of 140 ℃, exhibits 81.1% selectivity to IPB and 97.2% selectivity to all alkyaltion products(including IPB, DIPBs and TIPB) with a similar conversion of propylene in comparision with MCM-49.

Key words: MCM-49 zeolite, Alkylation benzene with propylene, Phosphorus acid

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