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Densification of Silica Spheres: A New Pathway to Nano-Dimensioned Zeolite-Based Catalysts

机译:二氧化硅球的致密化:一种新的纳米沸石基催化剂的途径

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摘要

Nanosized materials are expected to play a unique role in the development of future catalytic processes. Herein, pre-prepared and geometrically well-defined amorphous silica spheres are densified into silicarich zeolites with nanosized dimensions. After the densification, the obtained nanosized zeolites exhibit the same spherical morphology like the starting precursor but characterized by a drastically reduced size, higher density, and high crystallinity. The phase transformation into crystalline zeolite material and the densification effect are achieved through a well-controlled steam-assisted treatment of the larger precursor particles so that the transformation process proceeds always towards the center of the spheres, just like a shrinking process. Furthermore, this procedure is applicable also to commercially available silica particles, as well as aluminum-containing systems (precursors) leading to acidic nano-catalysts with improved catalytic performance.
机译:纳米化材料有望在未来催化过程的发展中发挥着独特作用。 这里,预制和几何定义明确定义的非晶二氧化硅球被致密化成具有纳米尺寸尺寸的硅化沸石。 在致密化之后,所得纳米沸石具有相同的球形形态,如起始前体,但其特征在于尺寸大小,更高的密度和高结晶度。 通过较大的前体颗粒的良好控制的蒸汽辅助处理来实现将相变成结晶沸石材料和致密化效果,使得转变过程总是朝向球体的中心进行,就像一个收缩过程一样。 此外,该方法也适用于市售的二氧化硅颗粒,以及导致具有改善的催化性能的酸性纳米催化剂的含铝系统(前体)。

著录项

  • 来源
    《Chemistry: A European journal》 |2017年第46期|共4页
  • 作者单位

    Lehrstuhl fer Chemische Reaktionstechnik Friedrich-Alexander Universit-t (FAU) Erlangen-Nernberg Egerlandstr. 3 91058 Erlangen (Germany);

    Institute of Micro-and Nanostructure Research and Center for Nanoanalysis and Electron Microscopy (CENEM) FAU Erlangen-Nernberg Cauerstr. 6 91058 Erlangen (Germany);

    Lehrstuhl fer Chemische Reaktionstechnik Friedrich-Alexander Universit-t (FAU) Erlangen-Nernberg Egerlandstr. 3 91058 Erlangen (Germany);

    Erlangen Catalysis Resource Center FAU Erlangen-Nernberg Egerlandstr. 3 91058 Erlangen (Germany);

    Lehrstuhl fer Kristallografie und Strukturphysik FAU Erlangen-Nernberg Staudtstr. 3 91058 Erlangen (Germany);

    Lehrstuhl fer Kristallografie und Strukturphysik FAU Erlangen-Nernberg Staudtstr. 3 91058 Erlangen (Germany);

    Erlangen Catalysis Resource Center FAU Erlangen-Nernberg Egerlandstr. 3 91058 Erlangen (Germany);

    Institute of Micro-and Nanostructure Research and Center for Nanoanalysis and Electron Microscopy (CENEM) FAU Erlangen-Nernberg Cauerstr. 6 91058 Erlangen (Germany);

    Lehrstuhl fer Chemische Reaktionstechnik Friedrich-Alexander Universit-t (FAU) Erlangen-Nernberg Egerlandstr. 3 91058 Erlangen (Germany);

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用化学;
  • 关键词

    catalytic cracking; crystallization; heterogeneous catalysis; nanoparticles; silica-rich zeolites;

    机译:催化裂化;结晶;异构催化;纳米颗粒;富含二氧化硅的沸石;

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