Iron(III)-Modified Tungstophosphoric Acid Supported
on Titania Catalyst: Synthesis, Characterization, and Friedel–Craft
Acylation of <i>m</i>‑Xylene
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Abstract
The
Friedel–Craft acylation of <i>m</i>-xylene
with benzoyl chloride over iron-modified tungstophosphoric acid supported
on titania was investigated. It was found that FeTPA/TiO<sub>2</sub> catalyst displayed excellent catalytic performance for this reaction.
Furthermore, a series of catalysts were prepared and characterized
by FT-IR, XRD, BET, NH<sub>3</sub>-TPD, and Py-IR. The results indicated
that both the Lewis acidity and the textural properties presented
significant influences on their catalytic performance. Moreover, the
influence of catalyst calcination temperature to the above reaction
was also studied. The reaction parameters, including reaction temperature,
catalyst dose, and molar ratio of <i>m</i>-xylene to benzoyl
chloride, were optimized, and a 95.1% yield of 2,4-dimethylbenzophenone
was obtained under optimal conditions. Finally, the kinetics of the
benzoylation of <i>m</i>-xylene over 30% FeTPA/TiO<sub>2</sub> was established