Abstract

Two procedures were suggested for preparing a micro-mesoporous zeolite of MTT topology (ZSM-23 type) with the molar ratio SiO₂/Al₂O₃ = 100 in the presence of dimethylformamide as a template. The first procedure involves hydrothermal crystallization under the conditions ensuring the formation of nanosized crystals. The second procedure is postsynthetic treatment of the zeolite with a NaOH solution to increase the mesopore volume. Samples of ZSM-23 zeolites with the crystal size of 100–200 nm with improved textural characteristics (micropore volume up to 0.1 cm³ g^–1, mesopore volume up to 0.70 cm³ g^–1) were obtained in >85% yield based on the silica used. The acid characteristics of the synthesized samples are similar to those of the zeolites prepared using pyrrolidine, which is expensive and is not produced in Russia.

中文翻译：

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ZSM-23微孔沸石的合成

摘要

提出了两种方法，以二甲基甲酰胺为模板，以摩尔比SiO ₂ / Al ₂ O ₃ = 100制备MTT拓扑的微孔沸石（ZSM-23型）。第一个步骤涉及在确保形成纳米级晶体的条件下进行水热结晶。第二种方法是用NaOH溶液对沸石进行后合成处理，以增加中孔体积。ZSM-23沸石样品的晶体尺寸为100–200 nm，并且具有改善的组织特性（微孔体积最大为0.1 cm ³ g ^–1，中孔体积最大为0.70 cm ³ g ^–1以所用的二氧化硅为基准，以> 85％的收率获得）。合成样品的酸特性与使用吡咯烷制备的沸石的酸特性相似，后者昂贵且在俄罗斯未生产。