Acylation of Anisole With Benzoyl Chloride Over Rapidly Synthesized Fly Ash-Based HBEA Zeolite.
| Autor: | Ameh AE; Environmental and Nano Science Research Group, Department of Chemistry, University of the Western Cape, Bellville, South Africa., Musyoka NM; Centre for Nanostructures and Advanced Materials (CeNAM), Chemicals Cluster, Council for Scientific and Industrial Research (CSIR), Pretoria, South Africa., Oyekola O; Department of Chemical Engineering, Cape Peninsula University of Technology, Cape Town, South Africa., Louis B; Institut de Chimie et Procédés pour l'Energie l'Environnement et la Santé (ICPEES), UMR 7515, CNRS, Université de Strasbourg, Strasbourg, France., Petrik LF; Environmental and Nano Science Research Group, Department of Chemistry, University of the Western Cape, Bellville, South Africa. |
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| Jazyk: | angličtina |
| Zdroj: | Frontiers in chemistry [Front Chem] 2021 Jun 18; Vol. 9, pp. 683125. Date of Electronic Publication: 2021 Jun 18 (Print Publication: 2021). |
| DOI: | 10.3389/fchem.2021.683125 |
| Abstrakt: | Stable HBEA zeolite with high surface area and strong acid sites was synthesized from coal fly ash-based silica extract via indirect hydrothermal synthesis. The rapid HBEA hydrothermal crystallization times of 8, 10, and 12 h were achieved through a reduced molar water fraction in the synthesis composition. The HBEA zeolites prepared from fly ash silica extract exhibited well-defined spheroidal-shaped crystal morphology with uniform particle sizes of 192, 190, or 239 nm obtained after 8, 10, or 12 h of synthesis time, respectively. The high surface area and the microporous area of 702 and 722 m 2 /g were achieved as a function of shorter hydrothermal synthesis durations (10 and 24 h, respectively) compared to 48 or 72 h, which resulted in HBEA zeolites with lower surface areas of 538 and 670 m 2 /g. Likewise, temperature-programmed desorption measurements of fly ash-based HBEA zeolites revealed the presence of weak and strong acid sites in the zeolite. The submicron crystal sizes with a well-defined porosity of HBEA zeolites enhanced the diffusion of anisole and benzoyl chloride molecules toward the active acid sites and hence showed better conversion and selectivity in acylation products. High conversion of benzoyl chloride with anisole was achieved, reaching up to 83% with a 93-96% selectivity toward 4-methoxyacetophenone. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2021 Ameh, Musyoka, Oyekola, Louis and Petrik.) |
| Databáze: | MEDLINE |
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