Synthesis, characterization of polystyrene-phosphate films and their application as heterogeneous catalyst for Knoevenagel condensation in solvent-free conditions

Abstract

Novel film catalysts of the polystyrene (Ps) and trimethyl phosphate (P) nanoparticles were synthesized on glass substrates by soft chemistry using doctor blade method. Subsequently, the prepared Ps–P film catalysts were characterized by various techniques, including fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), density (d), polarizing microscope (PM), X-ray diffraction (XRD) and thermal analysis. According to the results, the structure and morphology of film catalysts were confirmed by all analyses. The Ps–P films, as heterogeneous solid catalysts, have demonstrated strong activity for Knoevenagel condensation, producing alkenes of high purity. The recovered yields are excellent, up to 96% in solvent-free conditions at room temperature. Further, the film catalysts have showed high stability, good reusability (up to five times) while maintaining their efficiency and productivity.

Graphic Abstract

In the present study, the polystyrene/phosphate film catalysts were characterized and synthesized by soft chemistry method. These film catalysts were show an excellent catalytic activity for Knoevenagel condensation reaction. Further, they have demonstrated high yields, in solvent-free at room temperature, with a good reusability and high stability.

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Acknowledgements

We thank Dr Mrabet Souad for their assistance in the polarizing microscope analysis.

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Correspondence to HALIMA EL AADAD or ABDELKRIM CHAHINE.

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EL AADAD, H., BENZEKRI, Z., BOUKHRIS, S. et al. Synthesis, characterization of polystyrene-phosphate films and their application as heterogeneous catalyst for Knoevenagel condensation in solvent-free conditions. J Chem Sci 132, 87 (2020). https://doi.org/10.1007/s12039-020-01798-x

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Keywords

  • Film catalyst
  • doctor blade
  • heterogeneous catalyst
  • Knoevenagel condensation
  • solvent-free