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Seed-assisted, template-free synthesis of ZSM-5 zeolite from natural aluminosilicate minerals

机译：种子辅助，无模板的天然铝硅酸盐矿物合成ZSM-5沸石

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摘要

The hydrothermal synthesis of zeolite from chemical Al/Si source in the presence of structure directing agent is considered to be a resource extensive, energy consuming, and environmental unfriendly process. Herein, we report a novel, cost-effective, and eco-friendly synthesis for the preparation of ZSM-5 zeolite from silicon-rich diatomite and aluminum-rich rectorite minerals in the absence of organic structure-directing agent and chemical Al/Si source. Synthesis factors (SiO2/Al2O3, Na2O/SiO2, and H2O/SiO2 molar ratios along with seed content) and crystallization behavior were systematically investigated, providing fundamental knowledges on the formation of ZSM-5 from natural minerals. Synthesis under the optimized conditions (SiO2/Al2O3 ratio of around 38, Na2O/SiO2 ratios of 0.12-0.15, H2O/SiO2 ratios of 15-25, and seed content above 0.5%) led to production of highly crystalline ZSM-5 zeolite with hexagonal prism morphology and large surface area. Various characterization techniques tracking the products at different crystallization times revealed that the crystallization process consisted of three stages: short induction stage (0-6 h), rapid growth stage (6-18 h), and stable growth stage (18-36 h). Moreover, the synthesized ZSM-5 crystals can be used as effective seed for producing the next generation of ZSM-5 zeolite.
机译：在结构导向剂的存在下由化学Al / Si源水热合成沸石被认为是资源丰富，耗能且对环境不利的过程。本文中，我们报告了一种新颖，经济高效且环保的合成方法，该方法无需有机结构导向剂和化学铝/硅源即可从富含硅的硅藻土和富含铝的累托石矿物制备ZSM-5沸石。系统地研究了合成因子（SiO2 / Al2O3，Na2O / SiO2和H2O / SiO2摩尔比以及晶种含量）和结晶行为，为从天然矿物中形成ZSM-5提供了基础知识。在最佳条件下合成（SiO2 / Al2O3比约为38，Na2O / SiO2比值为0.12-0.15，H2O / SiO2比值为15-25，且晶种含量超过0.5％）导致生产出具有高结晶度的ZSM-5沸石六角棱柱形态，表面积大。跟踪产物在不同结晶时间的各种表征技术表明，结晶过程包括三个阶段：诱导期短（0-6小时），快速生长阶段（6-18小时）和稳定生长阶段（18-36小时）。 。而且，合成的ZSM-5晶体可以用作生产下一代ZSM-5沸石的有效晶种。

著录项

  • 来源
    《Applied clay science》 |2018年第6期|177-185|共9页
  • 作者

    Yue Yuanyuan; Kang Ying; Bai Yu; Gu Liliang; Liu Haiyan; Bao Jie; Wang Tinghai; Yuan Pei; Zhu Haibo; Bai Zhengshuai; Bao Xiaojun;

  • 作者单位

    Fuzhou Univ, Coll Chem Engn, Natl Engn Res Ctr Chem Fertilizer Catalyst, Fuzhou 350002, Peoples R China;

    Fuzhou Univ, Coll Chem Engn, Natl Engn Res Ctr Chem Fertilizer Catalyst, Fuzhou 350002, Peoples R China;

    Fuzhou Univ, Coll Chem Engn, Natl Engn Res Ctr Chem Fertilizer Catalyst, Fuzhou 350002, Peoples R China;

    Fuzhou Univ, Coll Chem Engn, Natl Engn Res Ctr Chem Fertilizer Catalyst, Fuzhou 350002, Peoples R China;

    China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China;

    Fuzhou Univ, Coll Chem Engn, Natl Expt Teaching Demonstrating Ctr, Fuzhou 350116, Fujian, Peoples R China;

    Fuzhou Univ, Coll Chem Engn, Natl Engn Res Ctr Chem Fertilizer Catalyst, Fuzhou 350002, Peoples R China;

    Fuzhou Univ, Coll Chem Engn, Natl Engn Res Ctr Chem Fertilizer Catalyst, Fuzhou 350002, Peoples R China;

    Fuzhou Univ, Coll Chem Engn, Natl Engn Res Ctr Chem Fertilizer Catalyst, Fuzhou 350002, Peoples R China;

    Fuzhou Univ, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350116, Fujian, Peoples R China;

    Fuzhou Univ, Coll Chem Engn, Natl Engn Res Ctr Chem Fertilizer Catalyst, Fuzhou 350002, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ZSM-5 zeolite; Template-free; Seed-assisted synthesis; Natural minerals; Crystallization behavior;

    机译：ZSM-5分子筛;无模板;种子辅助合成;天然矿物;结晶行为;

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