Abstract: Shaped γ-Al2O3-ZSM-5 composites with different zeolite content (0–95 wt%) were studied. The precursor of the alumina binder was a pseudoboehmite. The composite extruded samples were analyzed by XRD, IR spectroscopy, EDX mapping, and MAS NMR. The XRD method demonstrated a decrease in the intensity of the ZSM-5 reflexes in the extrudates compared with the physical mixtures, indicating a decrease in the relative crystallinity of the zeolite. A blue shift of the Si–O–T stretching mode in the zeolite was observed in the IR spectra of the extrudates; the position of the corresponding band was found to be linear with respect to the ZSM-5 content in the extrudates. This observation may indicate the dealumination of the ZSM-5 during the shaping process. The Si/Al ratio of the ZSM-5 in the composites was determined from 29Si MAS NMR, and an increase in the Si/Al ratio compared with the parent zeolite was demonstrated as a function of the ZSM-5 content in the extrudates. The radial crush strength of the extrudates exhibited a non-linear dependence on the ZSM-5 content and was non-additive with respect to γ-Al2O3 and ZSM-5 components. The maximum strength values were attained at ZSM-5 contents ranging from 10 to 30 wt%, which were higher than those observed for shaped γ-Al2O3.

Cite: Lashchenko D.I. , Kukushkin R.G. , Danilova I.G. , Yakovlev I.V. , Bulavchenko O.A. , Lyulyukin A.P. , Rodina V.O. , Yakovlev V.A.
Effect of the Alumina Binder Content on the Mechanical Strength and the Si/Al Ratio in the Zeolite Framework in the Shaped γ-Al2O3-ZSM-5 Composites
Materials Today Chemistry. 2025. V.46. 102735 :1-13. DOI: 10.1016/j.mtchem.2025.102735 WOS Scopus OpenAlex

Dates:

Submitted:	Mar 10, 2025
Accepted:	Apr 30, 2025
Published online:	May 15, 2025
Published print:	Jun 1, 2025

Identifiers:

Web of science:	WOS:001493023300001
Scopus:	2-s2.0-105004878786
OpenAlex:	W4410396149

Citing: Пока нет цитирований

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