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Title: Acylation of Anisole with Benzoyl Chloride over rapidly synthesized fly ash–based HBEA zeolite
Authors: Ameh, Alechine E. 
Musyoka, Nicholas M. 
Oyekola, Oluwaseun 
Louis, Benoit 
Petrik, Leslie Felicia 
Keywords: Coal fly ash;HBEA zeolite;molar composition;acylation reaction;conversion;selectivity
Issue Date: 2021
Publisher: Frontiers Media S.A.
Source: Ameh, A.E., Musyoka, N.M., Oyekola, O. et al. 2021. Acylation of Anisole with Benzoyl Chloride over rapidly synthesized fly ash–based HBEA zeolite. Frontiers in Chemistry, 9: 683125. []
Journal: Frontiers in Chemistry 
Abstract: 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 m2 /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 m2 /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.
Description: Article
ISSN: 2296-2646
Appears in Collections:Appsc - Journal Articles (DHET subsidised)

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