Gong, Jiang-Tian and Alomar, Taghrid S. and Almasoud, Najla and Pace, Ludovica and Vicente, Aurelie and Maireles-Torres, Pedro and Juan, Joon Ching and El-Bahy, Zeinhom M. and Mintova, Svetlana and Ng, Eng-Poh (2024) Soft-templating synthesis of hierarchical mordenite as high-performance catalyst for cyclic acetals production via acetylation of glycerol and benzaldehyde. Microporous and Mesoporous Materials, 372. p. 113111. ISSN 1387-1811, DOI https://doi.org/10.1016/j.micromeso.2024.113111.
Full text not available from this repository.Abstract
Highly active hierarchical mordenite zeolite with micro/mesoporosity (TM-n) for selective synthesis of cyclic acetals via acetylation reaction is reported. The hierarchical zeolite is synthesized using soft-templating approach with variations in octadecyltrimethoxysilane (OTMS/Al2O3 ratio, n = 0.2, 0.3 and 0.4) in precursor hydrogels. The results reveal that OTMS not only creates secondary mesoporosity in zeolite framework (larger mesopore volume, external surface area, average pore diameter), but also influences the crystallization process, altering the crystal morphology, crystallinity and Si/Al ratios. Among TM-n zeolites prepared, TM-0.3 hierarchical mordenite has the optimum OTMS amount incorporated while further increasing the OTMS amount leads to the formation of ANA/GIS intergrowth. Thanks to the accessible hierarchical porosity, reduced acidity and morphological effects, the TM-0.3 hierarchical mordenite exhibits excellent catalytic performance (84.1% conversion, TOF = 0.087 s-1, 61.5% dioxolane selectivity) in acetylation of glycerol and benzaldehyde (160 degrees C, 20 min) better than pristine mordenite. The catalyst is reusable for five runs with minimal loss of activity (TOF = 0.087 -> 0.084 s-1), making it a promising catalyst for chemical productions involving bulky molecules. In addition, comparative catalytic tests with classical homogeneous and heterogeneous catalysts, including H2SO4, HCl, CH3COOH, H-Y, H-LTL, Na-X, Na-A, were performed.
| Item Type: | Article |
|---|---|
| Funders: | USM Short -Term Grant (304/PKIMIA/6315725), Princess Nourah bint Abdulrahman University (PNURSP2024R47) |
| Uncontrolled Keywords: | Hierarchical mordenite; Zeolite; Octadecyltrimethoxysilane; Acetylation of glycerol; Acetal |
| Subjects: | Q Science > Q Science (General) Q Science > QD Chemistry |
| Divisions: | Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 30 Sep 2024 02:46 |
| Last Modified: | 30 Sep 2024 02:46 |
| URI: | http://eprints.um.edu.my/id/eprint/45231 |
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