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<p>A novel nanocatalyst composed of platinum nanoparticles (Pt NPs), gum acacia polymer (GAP), and nanoscale ZnO was developed for the selective hydrogenation of nitroarenes to arylamines under mild conditions. In this hybrid system, Pt NPs act as the primary catalytic sites, GAP functions as a non-toxic and biocompatible reducing and stabilizing agent that ensures nanoparticle dispersion, and ZnO nanoparticles serve as a support that enhances catalytic efficiency and stability through electronic and structural interactions. The structural and compositional features of the nanocatalyst were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). Results confirmed well-dispersed Pt NPs (4.62%) stabilized within the GAP matrix and a uniform distribution of ZnO nanoparticles, validating the successful integration of all components. The catalyst efficiently utilized molecular hydrogen for the reduction of nitroarenes, delivering excellent activity and selectivity. Notably, ~ 99% yield for nitrobenzene hydrogenation was achieved at room temperature in methanol within 3&#xa0;h, while maintaining high performance over five reuse cycles. This environmentally benign strategy provides a sustainable platform for nitroarene hydrogenation, offering mild reaction conditions, high selectivity, recyclability, and significant potential for green catalytic applications.</p> Graphical Abstract <p></p>

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Sustainable synthesis of Pt–ZnO nanoparticles encapsulated in gum acacia as a facile nanocatalyst for nitroarene hydrogenation

  • 期刊论文

  • 发表日期：

    2025年10月4日

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  • Supriya Prakash,
  • Selvakumar Ponnusamy,
  • Jagadeeswari Rangaraman,
  • Brindha Thirumalairaj

摘要

A novel nanocatalyst composed of platinum nanoparticles (Pt NPs), gum acacia polymer (GAP), and nanoscale ZnO was developed for the selective hydrogenation of nitroarenes to arylamines under mild conditions. In this hybrid system, Pt NPs act as the primary catalytic sites, GAP functions as a non-toxic and biocompatible reducing and stabilizing agent that ensures nanoparticle dispersion, and ZnO nanoparticles serve as a support that enhances catalytic efficiency and stability through electronic and structural interactions. The structural and compositional features of the nanocatalyst were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). Results confirmed well-dispersed Pt NPs (4.62%) stabilized within the GAP matrix and a uniform distribution of ZnO nanoparticles, validating the successful integration of all components. The catalyst efficiently utilized molecular hydrogen for the reduction of nitroarenes, delivering excellent activity and selectivity. Notably, ~ 99% yield for nitrobenzene hydrogenation was achieved at room temperature in methanol within 3 h, while maintaining high performance over five reuse cycles. This environmentally benign strategy provides a sustainable platform for nitroarene hydrogenation, offering mild reaction conditions, high selectivity, recyclability, and significant potential for green catalytic applications.

Graphical Abstract