Comparative analysis of parent and modified ZSM-5 zeolites: Insights from positron annihilation lifetime spectroscopy

Palčić, Ana; Bosnar, Damir; Hršak, Patricija; Bronić, Josip; Bosnar, Sanja (2024) Comparative analysis of parent and modified ZSM-5 zeolites: Insights from positron annihilation lifetime spectroscopy. Radiation Physics and Chemistry, 223 . ISSN 0969-806X

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Abstract

Modified zeolite ZSM-5 samples were prepared by synthesis in the presence of the organics acting as mesoporogens: cationic surfactant, hexadecyltrimethylammonium bromide (CTAB) and cationic polymer, polydiallyldimethylammonium chloride (PDADMAC), as well as by alkali etching of the parent zeolite. Properties of modified zeolites were compared to the parent ZSM-5 zeolite. X-ray diffractograms demonstrate that the obtained modified zeolite ZSM-5 samples in all cases have preserved parent crystalline zeolite framework of the MFI-type. However, scanning electron micrographs of the same samples show morphology variations of the modified samples as compared to the starting zeolite. Thermogravimetric analyses show distinct weight loss curves of the samples. Differences have been also noted in the hydroxyl stretching range of the infrared spectra, and in the results of positron annihilation lifetime spectroscopy (PALS) measurements, which indicated dissimilarities by probing free volume in parent and modified zeolite ZSM-5 samples. In that way, PALS as scarcely used technique in zeolite studies, proved its applicability in structural investigation of this kind.

Item Type:	Article
Uncontrolled Keywords:	zeolite ZSM-5; hierarchical structure; CTAB; PDADMAC; PALS
Subjects:	NATURAL SCIENCES NATURAL SCIENCES > Physics NATURAL SCIENCES > Chemistry
Divisions:	Division of Materials Chemistry
Projects:	Project title Project leader Project code Project type Sinteza naprednih anorganskih katalizatora s povećanim brojem kiselih mjesta-SAdInCat Josip Bronić IP-2016-06-2214 HRZZ Zeoliti s malim šupljinama modificirani bakrom pogodni za primjenu u zaštiti okoliša-SMALLPORE Ana Palčić; Magdalena Jablonska UIP-2019-04-4977 HRZZ Applications of Fast Pulse Digitizers in Positron Emission Particle Tracking Systems- Damir Bosnar CRP20871 IAEA
Depositing User:	Sanja Bosnar
Date Deposited:	19 Jan 2026 08:45
URI:	http://fulir.irb.hr/id/eprint/10982
DOI:	10.1016/j.radphyschem.2024.111919

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