Synthesis of Micro-Mesoporous ZSM-23 Zeolite

Two procedures were suggested for preparing a micro-mesoporous zeolite of MTT topology (ZSM-23 type) with the molar ratio SiO 2 /Al 2 O 3 = 100 in the presence of dimethylformamide as a template. The first procedure involves hydrothermal crystallization under the conditions ensuring the formation of...

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Published inPetroleum chemistry Vol. 61; no. 3; pp. 276 - 283
Main Authors Pirutko, L. V., Parfenov, M. V., Lysikov, A. I., Gerasimov, E. Yu
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.03.2021
Springer
Springer Nature B.V
Subjects
Aluminum oxide
Chemistry
Chemistry and Materials Science
Crystallization
Dimethylformamide
Industrial Chemistry/Chemical Engineering
Silicon dioxide
Topology
Zeolites
finely crystalline ZSM-23
template
hydrothermal crystallization
MTT zeolite
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Summary:Two procedures were suggested for preparing a micro-mesoporous zeolite of MTT topology (ZSM-23 type) with the molar ratio SiO 2 /Al 2 O 3 = 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 cm 3 g –1 , mesopore volume up to 0.70 cm 3 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.
ISSN:0965-5441
1555-6239
DOI:10.1134/S0965544121020080