Sustainable synthesis of MFI zeolite and derived metal-acid bifunctional catalysts for hydroisomerization of n-heptane

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2024-09-07 DOI:10.1007/s10971-024-06542-2

Mengxuan Zhu, Wenqi Xu, Longyang Wang, Rui Wang, Heng Jiang, Changzi Jin

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Abstract

Developing sustainable synthesis method of versatile zeolites to overcome the shortcoming of traditional process is of significant for development of green chemistry and environmentally friendly techniques. In this work, MFI zeolite (ZSM-5) was synthesized through organotemplate-, solvent- and seed-free sustainable process comprising physical grinding and quasi-solid state crystallization and utilizing commercial silica gel or Stöber colloidal SiO₂ as silica source. The key influencing factors to this sustainable synthesis process, such as starting material composition, crystallization temperature and time, had been unambiguously investigated by combining a series of characterization techniques. It is revealed that the starting material with SiO₂/Al₂O₃ and Na₂O/SiO₂ at 30–40 and 0.072, respectively, is suitable to obtain zeolite product with high crystallinity. The presence of right amount of water (or alcohol) is also crucial. In addition, this green synthesis method can be extended into the fabrication of encapsulated metal-zeolite bifunctional catalyst, which is effective in hydroisomerization of n-heptane. These results are instructive for development of sustainable synthesis of aluminosilicate zeolites and derived heterogeneous catalysts.

Graphical Abstract

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可持续合成用于正庚烷加氢异构化的 MFI 沸石和衍生金属酸双功能催化剂

开发多功能沸石的可持续合成方法，克服传统工艺的不足，对于发展绿色化学和环境友好技术具有重要意义。在这项工作中，利用商用硅胶或斯托伯胶体二氧化硅作为硅源，通过物理研磨和准固态结晶等有机模板、无溶剂和无种子的可持续工艺合成了 MFI 沸石（ZSM-5）。通过结合一系列表征技术，明确研究了这种可持续合成工艺的关键影响因素，如起始材料成分、结晶温度和时间。结果表明，SiO2/Al2O3 和 Na2O/SiO2 分别为 30-40 和 0.072 的起始材料适合获得高结晶度的沸石产品。适量的水（或酒精）的存在也很关键。此外，这种绿色合成方法还可扩展到封装金属-沸石双功能催化剂的制备，该催化剂对正庚烷的加氢异构化非常有效。这些结果对开发铝硅酸盐沸石和衍生异相催化剂的可持续合成具有指导意义。

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.