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Comparative Study of Nano-ZSM-5 Catalysts Synthesized in OH~- and F~- Media

机译：OH〜-和F〜-介质合成纳米ZSM-5催化剂的比较研究

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摘要

This study reports the seeded synthesis of MFI-type (ZSM-5) zeolite in fluoride medium at pH = 8.5. Crystal growth kinetics of the resulting zeolite (ZSM-5-F) as a function of seed content and crystallization temperature is studied. The crystallization time is reduced to 1.5 h and crystals with sizes below 200 nm and a Si/AI ratio of 23.6 are obtained. A zeolite with similar characteristics but synthesized in a hydroxyl medium (ZSM-5-OH) is used to evaluate ZSM-5s synthesized in different crystallization media. Their physicochemical properties are compared and particular attention is paid to the nature, number, and distribution of silanol sites. The two zeolites exhibit similar number of Br(φ)nsted acid sites; however the material synthesized in a hydroxyl medium contains a substantially larger number of surface and internal silanols that impact significantly its catalytic performance in methanol to hydrocarbon transformation. While the two materials exhibit similar selectivity in methanol transformations, the catalyst synthesized in fluoride medium shows superior activity and resistance to deactivation. The results suggest that seeded synthesis in a fluoride medium can be used for the preparation of superior zeolite catalysts.
机译：这项研究报告了在pH = 8.5的氟化物介质中种子合成的MFI型（ZSM-5）沸石。研究了所得沸石（ZSM-5-F）的晶体生长动力学随晶种含量和结晶温度的变化。结晶时间减少到1.5 h，得到的晶体尺寸小于200 nm，Si / Al比为23.6。使用具有相似特性但在羟基介质（ZSM-5-OH）中合成的沸石来评估在不同结晶介质中合成的ZSM-5。比较了它们的理化性质，并特别注意了硅烷醇位点的性质，数量和分布。两种沸石具有相似数量的Br（φ）nsted酸位点。然而，在羟基介质中合成的材料包含大量的表面和内部硅烷醇，这极大地影响了其在甲醇到烃转化中的催化性能。虽然两种材料在甲醇转化中显示出相似的选择性，但在氟化物介质中合成的催化剂显示出优异的活性和抗失活性。结果表明，在氟化物介质中的种子合成可以用于制备高级沸石催化剂。

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  • 来源
    《Advanced Functional Materials》 |2014年第2期|257-264|共8页
  • 作者

    Zhengxing Qin; Louwanda Lakiss; Lubomira Tosheva; Jean-Pierre Cilson; Aurelie Vicente; Christian Fernandez; Valentin Valtchev;

  • 作者单位

    Laboratoire Catalyse & Spectrochimie ENSICAEN - Universite de Caen - CNRS 6 boulevard du Marechal Juin, 14050, Caen, France;

    Laboratoire Catalyse & Spectrochimie ENSICAEN - Universite de Caen - CNRS 6 boulevard du Marechal Juin, 14050, Caen, France;

    Division of Chemistry and Environmental Science Manchester Metropolitan University Chester St., Manchester, Ml, 5CD, UK;

    Laboratoire Catalyse & Spectrochimie ENSICAEN - Universite de Caen - CNRS 6 boulevard du Marechal Juin, 14050, Caen, France;

    Laboratoire Catalyse & Spectrochimie ENSICAEN - Universite de Caen - CNRS 6 boulevard du Marechal Juin, 14050, Caen, France;

    Laboratoire Catalyse & Spectrochimie ENSICAEN - Universite de Caen - CNRS 6 boulevard du Marechal Juin, 14050, Caen, France;

    Laboratoire Catalyse & Spectrochimie ENSICAEN - Universite de Caen - CNRS 6 boulevard du Marechal Juin, 14050, Caen, France;

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