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首页> 外文期刊>Advanced Functional Materials >Superior Mass Transfer Properties of Technical Zeolite Bodies with Hierarchical Porosity
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Superior Mass Transfer Properties of Technical Zeolite Bodies with Hierarchical Porosity

机译：具有多层孔隙的工业沸石体的优良传质特性

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摘要

Mass transfer in zeolite crystals can be enhanced by the introduction of a hierarchical network of auxiliary mesopores. To fully exploit pore engineering in the design of more efficient industrial catalysts, the benefit needs to be demonstrated over technically relevant forms. Here, the influence of shaping on the adsorption and diffusion properties of hierarchical ZSM-5 is assessed by studying the gravimetric uptake of 2,2-dimethylbutane over powders and millimeter-sized bodies. Formed by extrusion or granulation with clay binders, the latter display a complex trimodal network of micro-, meso-, and macropores. The enhanced intracrystalline diffusivity due to the interconnected mesopores is preserved in the macroscopic bodies, independent of the shaping method or binder applied. Furthermore the superior overall diffusivity is retained in the hierarchical bodies compared to their conventional (purely microporous) counterparts, despite the significant extracrystalline resistance to mass transfer. The connective participation of mesopores, leading to a 6 times improved effective diffusivity in hierarchical with respect to conventional zeolite powders, is revealed by the distinct dependence on the adsorbate concentration and the relationship with the mesopore surface area. Analysis of the thermodynamic parameters derived from the adsorption isotherm proves a sensitive method to detect binder-zeolite interactions induced upon shaping.
机译：通过引入辅助中孔的分层网络可以增强沸石晶体中的质量转移。为了在更高效的工业催化剂设计中充分利用孔工程技术，需要在技术上相关的形式上证明其优势。在这里，通过研究在粉末和毫米级物体上的2，2-二甲基丁烷的重量吸收，可以评估成形对分级ZSM-5吸附和扩散特性的影响。通过挤出或与粘土粘合剂造粒形成，后者显示出由微孔，中孔和大孔组成的复杂三峰网络。由于互连的中孔而导致的增强的晶体内扩散性被保留在宏观物体中，而与成型方法或所施加的粘合剂无关。此外，尽管它们对传质有明显的抗结晶性，但与传统的（纯微孔的）同类产品相比，分层体中仍保留了优异的整体扩散性。中孔的结缔参与，相对于传统的沸石粉末，其有效扩散率提高了6倍，这是由对吸附物浓度的明显依赖性及其与中孔表面积的关系所揭示的。对源自吸附等温线的热力学参数的分析证明了一种灵敏的方法，可以检测成型时诱导的粘合剂-沸石相互作用。

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  • 来源
    《Advanced Functional Materials》 |2014年第2期|209-219|共11页
  • 作者

    Laurent Gueudre; Maria Milina; Sharon Mitchell; Javier Perez-Ramirez;

  • 作者单位

    Institute for Chemical and Bioengineering Department of Chemistry and Applied Biosciences ETH Zurich Wolfgang-Pauli-Strasse 10 CH 8093, Zurich, Switzerland;

    Institute for Chemical and Bioengineering Department of Chemistry and Applied Biosciences ETH Zurich Wolfgang-Pauli-Strasse 10 CH 8093, Zurich, Switzerland;

    Institute for Chemical and Bioengineering Department of Chemistry and Applied Biosciences ETH Zurich Wolfgang-Pauli-Strasse 10 CH 8093, Zurich, Switzerland;

    Institute for Chemical and Bioengineering Department of Chemistry and Applied Biosciences ETH Zurich Wolfgang-Pauli-Strasse 10 CH 8093, Zurich, Switzerland;

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