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Mesoporous $\upgamma $-alumina was synthesized by the microwave-hydrothermal process with a shorter duration time at 150${^{\circ }}$C/2 h followed by calcination at 550${^{\circ }}$C/1 h. Ag nanoparticles (AgNPs) were impregnated into $\upgamma $-alumina under a reducing atmosphere at 450${^{\circ }}$C. The synthesized product was characterized by X-ray diffraction (XRD), thermogravimetric (TG)/differential thermal analysis (DTA), X-ray photoelectron spectroscopy (XPS), $\hbox {N}_{2}$ adsorption–desorption study, field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The BET surface area values of $\upgamma $-alumina and Ag-impregnated $\upgamma $-alumina were found to be 258 and 230 m$^{2}$ g$^{-1}$, respectively. FESEM images showed the formation of grain-like particles of 50–70 nm in size with a flake-like microstructure. The XRD, XPS and TEM studies confirmed the presence of Ag in the synthesized product. Catalytic properties of the product for CO oxidation was studied with the $T_{50}$ (50% conversion) and $T_{100}$ (100% conversion) values of 118 and 135${^{\circ }}$C, respectively; the enhanced values were compared with the literature reported values.

bulletin of materials science

Microwave-hydrothermal synthesis of mesoporous $$\upgamma $$ γ - $$\hbox {Al}_{2}\hbox {O}_{3}$$ Al 2 O 3 and its impregnation with AgNPs for excellent catalytic oxidation of CO