Abstract
Palladium‐based composites are widely used as a heterogeneous catalyst in carbon–carbon coupling reactions and in catalytic converters used in the car industry. In this work, we demonstrate a simple, green and scalable synthesis procedure to obtain palladium (Pd) based heterogeneous catalyst. Surface functionalized silica microparticles were obtained in one‐step by spray‐drying a colloidal suspension of silica nanoparticles and gum arabic, an environmental‐friendly biopolymer. Subsequently, palladium nanoparticles were reduced and attached to the substrate by gum arabic. The as‐synthesized composite was characterized by field‐emission scanning electron microscopy (FESEM), energy‐dispersive x‐ray spectroscopy (EDS), x‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), small angle x‐ray scattering (SAXS), and high‐resolution transmission electron microscopy (HR‐TEM). The Pd@SiO2 composite was used as a catalyst in the reduction reaction of 4‐nitrophenol by sodium borohydride. The catalyst showed good recycling properties. The present environmental‐friendly approach for fabrication of Pd‐based heterogeneous catalyst circumvents various complex chemical steps involved in conventional chemical methods and could be generalized for the production of ceramic or magnetite‐based Pd composites.
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