Acylation of anisole with benzoyl chloride over rapidly synthesized fly ash–based hbea zeolite
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Date
2021
Journal Title
Journal ISSN
Volume Title
Publisher
Frontiers Media
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.
Description
Keywords
Coal fly ash, HBEA zeolite, Molar composition, Acylation reaction, Acid, Chemistry
Citation
Ameh, A. E. et al. (2021). Acylation of anisole with benzoyl chloride over rapidly synthesized fly ash–based hbea zeolite. Frontiers in Chemistry 9,683125. 10.3389/fchem.2021.683125