Ultrasonic Pretreatment as a Tool for the Preparation of Low-Defect Zeolite Mordenite

0539489 - ÚFCH JH 2022 RIV US eng J - Journal Article
Kornas, Agnieszka - Olszówka, Joanna Elżbieta - Urbanová, Martina - Brabec, Libor - Rathouský, Jiří - Dědeček, Jiří - Pashkova, Veronika
Ultrasonic Pretreatment as a Tool for the Preparation of Low-Defect Zeolite Mordenite.
ACS Omega. Roč. 6, č. 3 (2021), s. 2340-2345. ISSN 2470-1343. E-ISSN 2470-1343
R&D Projects: GA ČR(CZ) GJ17-09188Y; GA MŠMT(CZ) EF16_013/0001821
Institutional support: RVO:61388955
Keywords : zeolites * ultrasonic pretreatment * 29Si magic-angle spinning nuclear magnetic resonance
OECD category: Physical chemistry
Impact factor: 4.132, year: 2021
Method of publishing: Open access

The effects of the ultrasonic (US) pretreatment of synthesis gel for the preparation of mordenite zeolite were studied in comparison with the classical stirring method. Even though the US pretreatment was performed before the hydrothermal crystallization, it significantly affected the properties of the obtained mordenite crystals. The US-assisted procedure resulted in a material with improved textural characteristics, in particular, the micropore volume accessible for nitrogen molecules in the as-made form. On the other hand, mordenite prepared with the classical stirring method demonstrated comparable sorption properties only after a postsynthetic treatment. Moreover, in the case of US-pretreated mordenite, altered crystal shape and more homogeneous morphology were observed. 29Si magic-angle spinning nuclear magnetic resonance (MAS NMR) demonstrated that the US pretreatment introduced structural changes on the atomic level, resulting in fewer defects (reflected in the number of silanol groups) and less pore blockage (affected by Na+ cations) for the as-made sample.
Permanent Link: http://hdl.handle.net/11104/0317226