Silver nanoparticles supported over Al2O3@Fe2O3 core-shell nanoparticles as an efficient catalyst for one-pot synthesis of 1,2,3-triazoles and acylation of benzyl alcohol

Metallic nanoparticles supported over core-shell metal oxide nanostructures have huge scope in heterogeneous catalysis due to the scope for fine dispersion of the reactive NPs on high surface area material. Silver nanoparticles are supported over Al2O3@Fe2O3 core-shell nanostructured material through aqueous phase reduction method. Ag-Al2O3@Fe2O3 core-shell nanoparticles has been characterized through powder X-ray diffraction, ultra high resolution transmission electron microscopy, scanning electron microscopy, N-2 adsorption/desorption isotherm, Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy and thermogravimetric analysis. The N-2 adsorption/desorption isotherms of Ag-Al2O3@Fe2O3 material are classified as typical type IV isotherm with a large H-2 type hysteresis loop for the mesopores. This core-shell mesoporous nanocatalyst showed high catalytic efficiency for the synthesis of 1,4-disubstituted 1,2,3-triazoles in water and acylation of benzyl alcohol under solvent-free conditions. The catalyst is heterogeneous in nature and can be easily recovered and reused without appreciable decrease in its catalytic activity. (C) 2017 Elsevier B.V. All rights reserved.