Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.202300389
Keywords
Phenol; Hydroxylation; Ionic Liquid; Mesoporous; Iron phosphate; Quinones
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In this study, a highly ordered hexagonal mesoporous iron phosphate material HMI-41 was successfully synthesized using an imidazolium-based ionic liquid as a structure directing agent. The HMI-41 catalyst showed excellent performance in acid medium for phenol hydroxylation, achieving high selectivity and conversion rates with a hydroquinone-to-catechol ratio that is the highest ever reported.
A highly organized hexagonal mesoporous iron phosphate framework structure with the designation HMI-41 was successfully synthesized for the first-time in a reproducible way using imidazolium-based ionic liquid as structure directing agent. The unique templating properties of ionic liquid generated a highly ordered well-crystallized mesoporous matrix having high surface area (445 m(2) g(-1)), thicker pore wall (2.1 nm) and narrow pore size distribution (3.1 nm). The presence of active sites within a tetrahedral framework structure made the novel HMI-41 catalyst highly effective for phenol hydroxylation in an acidic medium with hydrogen peroxide as the oxidant. The catalyst exhibited outstanding performance, achieving an impressive 80% hydroquinone selectivity and 21% phenol conversion with a hydroquinone-to-catechol ratio of seven, which is the highest value ever reported.
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