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The mechanism of promoter-induced zeolite nanosheet crystallization under hydrothermal and microwave irradiation conditions
Inorganic Chemistry Frontiers ( IF 7 ) Pub Date : 2020/02/04 , DOI: 10.1039/d0qi00012d
Evgeny R. Naranov 1, 2, 3, 4 , Alexey A. Sadovnikov 1, 2, 3, 4, 5 , Ivan M. Vatsouro 3, 4, 6, 7 , Anton L. Maximov 1, 2, 3, 4, 6
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The mechanism of MFI zeolite nanosheet formation was established under accelerated conditions using perchlorate ions and fresh zeolite seeds as promoters. The results indicated that the particles after pretreatment were initially formed as an ordered amorphous assembly that was stepwise converted into zeolite nanosheets. The MFI nanosheet fabrication occurs through the transformation from an MCM-41-like structure to a KIT-1-like structure, lamellar structure, disordered lamellar structure and MFI nanosheets. The application of uniform microwave heating with the addition of promoters made it possible to obtain the assembly of all types of structures in 6 hours. The MFI nanosheet generation process was analyzed by X-ray powder diffraction, IR spectroscopy, N2 adsorption isotherm measurements, SEM and TEM. A linear function of selectivity for bulky products in the solid acid alkylation process in proportion to the concentration of Brønsted acid sites has been determined for the materials possessing a mesophase.

中文翻译:

水热和微波辐照条件下助催化剂诱导的沸石纳米片晶化机理

使用高氯酸根离子和新鲜沸石种子作为促进剂,在加速条件下建立了MFI沸石纳米片的形成机理。结果表明,预处理后的颗粒最初形成为有序的无定形组件,然后逐步转化为沸石纳米片。通过从类似MCM-41的结构到类似KIT-1的结构,层状结构,无序层状结构和MFI纳米片的转变,可以进行MFI纳米片的制造。均匀微波加热加上促进剂的应用使得在6小时内获得所有类型结构的组装成为可能。通过X射线粉末衍射,IR光谱,N 2分析了MFI纳米片的生成过程吸附等温线测量,SEM和TEM。对于具有中间相的材料,已确定了在固体酸烷基化过程中对大体积产品的选择性与布朗斯台德酸位点浓度成比例的线性函数。
更新日期:2020-03-19
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