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Journal of Sol-Gel Science and Technology
Erschienen in: Journal of Sol-Gel Science and Technology 2/2022

22.03.2022 | Original Paper: Nano-structured materials (particles, fibers, colloids, composites, etc.)

Ag-PMA supported on MCM-41: Surface Acidity and Catalytic Activity

verfasst von: Wafaa S. Abo El-Yazeed, Sohier A. El-Hakam, Reda S. Salama, Amr A. Ibrahim, Awad I. Ahmed

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 2/2022

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Abstract

Herein Ag exchanged phosphomolybdic catalysts were synthesized by ion-exchange method and characterized using numerous techniques such as XRD, TEM, FTIR, and N2 adsorption-desorption measurements. The surface acidity of the as-synthesized materials was examined through FTIR spectra of chemisorbed pyridine and non-aqueous potentiometric titration of n-butylamine. XRD analysis displayed the weakness of the amorphous peak related to MCM-41 and the appearance of well-defined diffraction lines of the heteropoly acid by the addition of AgxPMA to MCM-41, indicating that the Ag salts of PMA@MCM-41 have good crystallinity compared with MCM-41. TEM images displayed the homogeneous distribution of AgxPMA inside and outside the pores of MCM-41 and maintained the hexagonal morphology of MCM-41. All the catalysts exhibited both Lewis and Brønsted acid sites; the Lewis acidity increased with increasing silver contents while the Brønsted acidity decreased as confirmed by FTIR spectra of chemisorbed pyridine. The catalytic activity of the prepared samples was studied through the preparation of 7-hydroxy-4-methyl coumarin and hydroquinone diacetate. The catalytic activity and the surface acidity decreased by loading an extra amount of silver ions due to the decrease in the protons of PMA. Reusability of the prepared catalysts showed that the catalyst could be reused numerous times without losing its catalytic performance.
Vorheriger Artikel Correction to: Use of thermal, dynamic, and mechanical analysis for characterizing sol-gel nano-TiO2 and PP@TiO2 advanced materials
Nächster Artikel Preparation and properties of enzyme-carrying silica xerogel based on TMOS/MTMS co-precursors

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Metadaten
Titel
Ag-PMA supported on MCM-41: Surface Acidity and Catalytic Activity
verfasst von
Wafaa S. Abo El-Yazeed
Sohier A. El-Hakam
Reda S. Salama
Amr A. Ibrahim
Awad I. Ahmed
Publikationsdatum
22.03.2022
Verlag
Springer US
Erschienen in
Journal of Sol-Gel Science and Technology / Ausgabe 2/2022
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-022-05755-7

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