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Catalytic Properties of a Hierarchical Zeolite Synthesized from a Natural Aluminosilicate Mineral without the Use of a Secondary Mesoscale Template

Authors

  • Dr. Jiajia Ding,

    1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, No. 18 Fuxue Road, 102249 Beijing (P.R. China)
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    • These authors contributed equally to the work.

  • Dr. Haiyan Liu,

    1. The Key Laboratory of Catalysis, China National Petroleum Corporation, China University of Petroleum, No. 18 Fuxue Road, 102249 Beijing (P.R. China), Fax: (+86) 10-89734979
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    • These authors contributed equally to the work.

  • Dr. Pei Yuan,

    1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, No. 18 Fuxue Road, 102249 Beijing (P.R. China)
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  • Gang Shi,

    1. The Key Laboratory of Catalysis, China National Petroleum Corporation, China University of Petroleum, No. 18 Fuxue Road, 102249 Beijing (P.R. China), Fax: (+86) 10-89734979
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  • Prof. Dr. Xiaojun Bao

    Corresponding author
    1. The Key Laboratory of Catalysis, China National Petroleum Corporation, China University of Petroleum, No. 18 Fuxue Road, 102249 Beijing (P.R. China), Fax: (+86) 10-89734979
    • The Key Laboratory of Catalysis, China National Petroleum Corporation, China University of Petroleum, No. 18 Fuxue Road, 102249 Beijing (P.R. China), Fax: (+86) 10-89734979
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Abstract

A hierarchical ZSM-5 zeolite with a bimodal meso-microporous system, high crystallinity, and a large surface area and meso-micropore volume was successfully synthesized from a natural layered aluminosilicate mineral rectorite without using a secondary mesoscale template. The physicochemical and catalytic properties of the hierarchical ZSM-5 zeolite were extensively characterized. The results showed that the mesopores of the synthesized hierarchical ZSM-5, which are almost slitlike intercrystal pores, originate from the construction of primary nanorods of the ZSM-5 zeolite. Analysis of the crystallization process revealed that the undissolved rectorite debris acted as seed crystals and played a structure-directing role, which is the key factor that influences the formation of the hierarchical structure. Such a hierarchical ZSM-5 zeolite, as a result of its unique structural characteristics and increased accessibility of acid sites, possessed a remarkably enhanced activity for the cracking of 1,3,5-triisopropylbenzene, a dramatically higher anti-deactivation ability for cumene conversion, and a significantly improved propylene-boosting performance for heavy oil cracking than the other catalysts tested.

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