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

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Abstract

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.

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Acknowledgements

The authors would like to thank the Director of CSIR-CGCRI for his kind permission to pursue this work. The author S.K., an AcSIR fellow, is grateful to CSIR, Government of India for her fellowship. The financial support from the Department of Science and Technology under the DST-SERB sponsored project, GAP 0616 (Grant No. SR/S3/ME/0035/2012), Government of India, is gratefully acknowledged.

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  1. Sol–Gel Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, 700 032, India

    Sukanya Kundu & Milan Kanti Naskar

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  1. Sukanya Kundu
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  2. Milan Kanti Naskar
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Correspondence to Milan Kanti Naskar.

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Kundu, S., Naskar, M.K. Microwave-hydrothermal synthesis of mesoporous \(\upgamma \)-\(\hbox {Al}_{2}\hbox {O}_{3}\) and its impregnation with AgNPs for excellent catalytic oxidation of CO. Bull Mater Sci 41, 161 (2018). https://doi.org/10.1007/s12034-018-1675-2

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