Inducing the Catalytic Activity in SrFe12O19 Via Chemical Modification

Anantharamaiah, PN and Mondal, S and Saha, S (2020) Inducing the Catalytic Activity in SrFe12O19 Via Chemical Modification. In: Catalysis Letters .

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Abstract

Abstract: In this study, we demonstrate that the catalytic activity could be induced in the hard magnetic strontium hexaferrite (SrFe12O19) system by replacing a small fraction of Fe by Cu. Nanocrystalline SrFe12O19 and SrCu0.3Fe11.7O19 samples were synthesized by a tartrate-gel method and their structural, microstructural, specific surface area and magnetic properties were studies. Subsequently, the nanocrystalline hexaferrite powders were employed as catalysts to drive 4-nitrophenol reduction reaction using the NaBH4 as the reducing agent. The progress of the catalytic reactions was evaluated using UV�visible spectrophotometer. The unsubstituted sample was found to be catalytically inactive whereas SrCu0.3Fe11.7O19 sample showed superior catalytic performance in transforming 4-nitrophenol to 4-aminophenol within 8 min. Reusability test confirmed that the SrCu0.3Fe11.7O19 catalyst retains its 100 activity even after five consecutive cycles. In addition, the effect of crystallite size of SrCu0.3Fe11.7O19 on the catalytic reduction reaction of 4-nitrophenol was investigated. The results indicated that the time taken to complete the reduction reaction has been increased as size of the crystallites increased, probably due to decrease in the large number of surface active sites of the catalyst. Graphic Abstract: Figure not available: see fulltext.. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.

Item Type:	Journal Article
Publication:	Catalysis Letters
Publisher:	Springer
Additional Information:	Copy right for this article belongs to Springer
Keywords:	Catalysis; Chemical modification; Copper compounds; Crystallite size; Ferrite; Nanocrystals; Reusability; Sodium Borohydride; Strontium compounds, 4-Nitrophenol reductions; Catalytic performance; Catalytic reactions; Catalytic reduction; Reduction reaction; Strontium hexaferrite; Surface active sites; Visible spectrophotometers, Catalyst activity
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	17 Nov 2020 11:49
Last Modified:	17 Nov 2020 11:49
URI:	http://eprints.iisc.ac.in/id/eprint/65936

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