Catalysis Communications (Sep 2022)

The role of phosphotungstic acid in enhancing the catalytic performance of UiO-66 (Zr) and its applications as an efficient solid acid catalyst for coumarins and dihydropyrimidinones synthesis

  • Fares T. Alshorifi,
  • Dina E. Tobbala,
  • Salah M. El-Bahy,
  • Mohamed A. Nassan,
  • Reda S. Salama

Journal volume & issue
Vol. 169
p. 106479

Abstract

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In recent study, we report a facile and easy technique for the synthesis phosphotungstic acid (PTA) with different weight contents (10, 25, 50 and 75 wt%) loaded on UiO-66 (Zr) as efficient and reusable catalysts for the preparation of coumarin and dihydropyrimidinones derivatives. The structural and textural properties of the prepared catalysts were characterized through XRD, FT-IR, TGA, BET, TEM, SEM, non-aqueous potentiometric titration and FT-IR of chemisorbed pyridine. 50.0 wt% of PTA/UiO-66 (Zr) catalyst showed the highest surface acidity (Ei = 578.5mV) and highest catalytic performance toward the preparation of 7-hydroxy-4-methyl coumarin (97.8%) and 3, 4-dihydropyrimidinones (94.7%).

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