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首页> 外文期刊>RSC Advances >One-pot synthesis of novel hierarchical bifunctional Ga/HZSM-5 nanosheets for propane aromatization
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One-pot synthesis of novel hierarchical bifunctional Ga/HZSM-5 nanosheets for propane aromatization

机译：一种新型分层双官能GA / HZSM-5丙烷芳族化的合成

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摘要

Hierarchical galloaluminosilicate nanosheets with the MFI structure have been successfully prepared by a one-pot hydrothermal process. Tetrabutylphosphonium hydroxide (TBPOH), a dual structure-directing agent (SDA), was used to simultaneously produce the MFI structure and the self-assemblies of nanolayers. The as-synthesized samples were characterized by means of XRD, TEM, SEM, EDS, ICP, Al-27 MAS NMR, H-2-TPR, NH3-TPD and N-2 physisorption. The galloaluminosilicate nanosheets exhibit outstanding properties, such as an extremely high meso/macroporosity (one to two orders of magnitude higher compared with the conventional zeolite), a uniform Si, Al and Ga distribution, along with the appropriate acidic properties. The galloaluminosilicate nanosheets can greatly enhance the catalytic performances in terms of activity (60 and 20% for propane conversion over the hierarchical Ga/HZSM-5 and the conventional zeolite, respectively), BTX selectivity (almost three times higher compared with the conventional zeolite), and significant reduction of deposited coke (approximately by 70%) for conversion of propane at 823 K under atmospheric pressure without any special pretreatments of catalysts. This first example demonstrates a simple and low-cost approach for the synthesis of hierarchical bifunctional zeolite nanosheets and the challenge for the development of heterogeneous catalysts.
机译：通过单罐水热法制备具有MFI结构的分层加铝硅酸盐纳米液。使用四仲膦鏻（TBPOH），使用双结构引导剂（SDA），同时产生MFI结构和纳米层的自组装。通过XRD，TEM，SEM，EDS，ICP，Al-27MAS NMR，H-2-TPR，NH 3-TPD和N-2理由，表征了AS合成的样品。加铝硅酸盐纳米片具有出色的性质，例如极高的中孔/巨孔（与常规沸石相比，较高的一个至两个数量级），均匀的Si，Al和Ga分布以及适当的酸性特性。加铝硅酸盐纳米液可以大大提高活性（60％和20％在分层GA / HZSM-5上丙烷转化的60％和20％），BTX选择性（与常规沸石相比几乎三倍）并且在大气压下在823k下转化丙烷的沉积焦（约70％）的显着降低，而无需任何特殊的催化剂预处理。该第一个实施例证明了一种简单而低成本的方法，用于合成分层双官能沸石纳米片以及非均相催化剂的开发的挑战。

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  • 来源
    《RSC Advances》 |2016年第4期|共7页
  • 作者

    Wannapakdee Wannaruedee; Wattanakit Chularat; Paluka Veerachart; Yutthalekha Thittaya; Limtrakul Jumras;

  • 作者单位

    Vidyasirimedhi Inst Sci &

    Technol Sch Energy Sci &

    Engn Dept Chem &

    Biomol Engn Rayong 21210 Thailand;

    Vidyasirimedhi Inst Sci &

    Technol Sch Energy Sci &

    Engn Dept Chem &

    Biomol Engn Rayong 21210 Thailand;

    Kasetsart Univ Dept Chem Bangkok 10900 Thailand;

    Vidyasirimedhi Inst Sci &

    Technol Sch Energy Sci &

    Engn Dept Chem &

    Biomol Engn Rayong 21210 Thailand;

    Vidyasirimedhi Inst Sci &

    Technol Sch Mol Sci &

    Engn Dept Mat Sci &

    Engn Rayong 21210 Thailand;

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  • 正文语种 eng
  • 中图分类 化学;
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