Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (9): 2025.doi: 10.7503/cjcu20200331

• Physical Chemistry • Previous Articles     Next Articles

Support Effect of Nanosized Hierarchical Silicalite-1 Zeolite on the Properties of Ziegler-Natta Catalyzed Polypropylene

HUANG Pai1, ZHOU Guangyuan2, LIU Bo3, WANG Lei1, ZHANG Jiaqi1()   

  1. 1.College of Materials Science and Engineering, Key Laboratory of Automobile Materials, Ministry of Education, Jilin University, Changchun 130012, China
    2.Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
    3.Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  • Received:2020-06-08 Online:2020-09-10 Published:2020-09-02
  • Contact: ZHANG Jiaqi E-mail:zhangjiaqi@jlu.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(61804063);the Science and Technology Development Plan of Jilin Province, China(20190201208JC)

Abstract:

Due to the characteristics of special pore structure, large specific surface area, excellent stability and unique shape selectivity, zeolites inorganic porous material has become excellent green inorganic supports. Herein, nanosized hierarchical silicalite-1(S-1) zeolite with MFI topology was used as the inorganic support for Ziegler-Natta catalyst. The physicochemical properties of nanosized S-1 support were characterized in detail by X-ray diffraction(XRD), scanning electron microscopy, nitrogen adsorption-desorption, and other characterization methods. The effects of S-1 support on properties of polypropylene were also studied. In propy- lene polymerization, the larger specific surface area and hierarchical characteristics of the nanozied inorganic support S-1 are beneficial to increase the loading of Ziegler-Natta and improve the diffusion of reactants and products. Besides, the S-1 support can serve as a morphology-directed template, thus exhibiting a replica effect on the polypropylene product. Likewise, the crystallinity and isotactic index of the polymer products are improved in the propylene polymerization reaction at the same pressure and reaction temperature, due to the shape-selective effect and the replica effect of the hierarchical S-1 inorganic support. Consequentially, the S-1 support is conducive to improving the melting point of polypropylene products.

Key words: Inorganic hierarchical porous support, Ziegler-Natta catalyst, Confined space, Propylene poly- merization

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