Inducing the Catalytic Activity in SrFe12O19 Via Chemical Modification

In this study, we demonstrate that the catalytic activity could be induced in the hard magnetic strontium hexaferrite (SrFe 12 O 19 ) system by replacing a small fraction of Fe by Cu. Nanocrystalline SrFe 12 O 19 and SrCu 0.3 Fe 11.7 O 19 samples were synthesized by a tartrate-gel method and their s...

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Bibliographic Details
Published inCatalysis letters Vol. 151; no. 1; pp. 221 - 231
Main Authors Anantharamaiah, P. N., Mondal, Sanjukta, Saha, Sujoy
Format Journal Article
LanguageEnglish
Published New York Springer US 2021
Springer Nature B.V
Subjects
Aminophenol
Catalysis
Catalysts
Catalytic activity
Chemical activity
Chemical reduction
Chemistry
Chemistry and Materials Science
Crystallites
Industrial Chemistry/Chemical Engineering
Magnetic properties
Nanocrystals
Nitrophenol
Organometallic Chemistry
Physical Chemistry
Reducing agents
Cu-substitution
Catalytic properties
BET analysis
Strontium hexaferrite
Magnetic properties
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Summary:In this study, we demonstrate that the catalytic activity could be induced in the hard magnetic strontium hexaferrite (SrFe 12 O 19 ) system by replacing a small fraction of Fe by Cu. Nanocrystalline SrFe 12 O 19 and SrCu 0.3 Fe 11.7 O 19 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 NaBH 4 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 SrCu 0.3 Fe 11.7 O 19 sample showed superior catalytic performance in transforming 4-nitrophenol to 4-aminophenol within 8 min. Reusability test confirmed that the SrCu 0.3 Fe 11.7 O 19 catalyst retains its 100% activity even after five consecutive cycles. In addition, the effect of crystallite size of SrCu 0.3 Fe 11.7 O 19 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
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-020-03292-y