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首页> 外文期刊>Surface Engineering and Applied Electrochemistry >Synthesis of ZSM-5 Zeolite from Metakaolinite: Effects of the SiO_2/Al_2O_3 Molar Ratio, the Initial Precursor and the Presence of Organic Template Agent
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Synthesis of ZSM-5 Zeolite from Metakaolinite: Effects of the SiO_2/Al_2O_3 Molar Ratio, the Initial Precursor and the Presence of Organic Template Agent

机译：偏莨菪石的合成ZSM-5沸石：SiO_2 / Al_2O_3摩尔比的影响，初始前体和有机模板剂的存在

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摘要

Highly crystalline ZSM-5 zeolites are successfully prepared from kaolinite as low cost precursor. The effects of SiO_2/Al_2O_3 molar ratio, the presence of tetrapropylammonium bromide (TPABr) and the initial precursor on the textural properties of the final products have been investigated. Crystallized samples have been characterized by scanning electron microscopy and nitrogen adsorption in addition to X-ray diffraction. The results show that getting pure ZSM-5 zeolite with a high crystallinity degree is directly dependent on the starting precursor as well as on the presence of the organic template highlighting the role of SiO_2/Al_2O_3 molar ratio. The directed-template ZSM-5 sample prepared frommetakaolinite with the smallest particles (crystal size of 700 nm) and a maximum crystallinity of 98% is obtained at a SiO_2/Al_2O_3 molar ratio of 31.69. Increasing the SiO_2/Al_2O_3 molar ratio to 41.13 isrequired to prepare an organic-template free ZSM-5 from metakaolinite with a relative crystallinity of 81%. In order to synthesize ZSM-5 zeolite from the acid-activated metakaolinite as the only silica and alumina sources, a SiO_2/Al_2O_3 molar ratio of 76.19 is used, the maximal crystallinity degree is 79%, with the largest ZSM crystals of about 3000 nm.
机译：高度结晶的ZSM-5沸石由高岭石成功制备，作为低成本前体。研究了SiO_2 / Al_2O_3摩尔比的影响，研究了四丙基溴化铵（TPABR）的存在和初始前体对最终产品的纹理性质。除了X射线衍射之外，还通过扫描电子显微镜和氮吸附来表征结晶样品。结果表明，具有高结晶度的纯ZSM-5沸石直接依赖于起始前体以及有机模板的存在，突出了SiO_2 / Al_2O_3摩尔比的作用。在SiO_2 / Al_2O_3摩尔比下，获得从最小颗粒（晶体尺寸为700nm）和98％的最大结晶度的ZSM-5样品的定向模板ZSM-5样品。将SiO_2 / Al_2O_3摩尔比增加到41.13，以制备来自偏莨菪碱的有机模板游离ZSM-5，相对结晶度为81％。为了将Zsm-5沸石从酸活化的偏石体中作为唯一的二氧化硅和氧化铝源合成，使用76.19的SiO_2 / Al_2O_3摩尔比，最大结晶度为79％，最大ZSM晶体约为3000nm 。

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    Y. Ghrib; N. Frini-Srasra; Srasra;

  • 作者单位

    Laboratoire de Physico-chimie des Materiaux Mineraux et leurs Applications Centre national des recherches en science des materiaux Bon Cedria Techno-Park BP 95-2050 Hammam Lif Tunis Tunisia;

    Laboratoire de Physico-chimie des Materiaux Mineraux et leurs Applications Centre national des recherches en science des materiaux Bon Cedria Techno-Park BP 95-2050 Hammam Lif Tunis Tunisia;

    Laboratoire de Physico-chimie des Materiaux Mineraux et leurs Applications Centre national des recherches en science des materiaux Bon Cedria Techno-Park BP 95-2050 Hammam Lif Tunis Tunisia;

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  • 正文语种 eng
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  • 关键词

    ZSM-5 zeolite; metakaolinite; organic template free; SiO_2/Al_2O_3 molar ratio; morphology;

    机译：ZSM-5沸石;Metakaolinite;有机模板自由;SiO_2 / Al_2O_3摩尔比;形态;

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