Preparation of Ag nanoparticle loaded mesoporous γ-alumina catalyst and its catalytic activity for reduction of 4-nitrophenol

In this paper, we report a simple chemical reduction method for synthesis of spherical Ag nanoparticles (average size ~ 7 nm) within mesoporous alumina matrix. Shape and size of the Ag nanoparticles and structure of the catalysts are investigated by using high resolution transmission electron microscopy, diffuse reflectance spectroscopy, N2 adsorption-desorption analysis, XRD and particle size analysis. The synthesized catalysts possess BET surface area of 281.6 m2/g and average pore size 6.38 nm. The synthesized Ag nanoparticle loaded mesoporous aluminas exhibit catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol.

Graphical abstractA simple chemical method has been reported for the synthesis of spherical Ag nanoparticles within mesoporous alumina matrix. The synthesized catalysts possess high surface area of 281.6 m2/g and average pore size 6.38 nm. The catalysts were acted as an efficient catalyst for the reduction of 4-nitrophenol to 4-aminophenol.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Novel method to prepare Ag nanoparticle supported heterogeneous catalyst. ► Preparation of spherical Ag nanoparticles within mesoporous γ-alumina. ► Efficient catalytic hydrogenation reaction of 4-nitrophenol to 4-amiophenol.