Transition metal Schiff base complexes supported on layered double hydroxide: synthesis, characterization and catalytic activity for the oxidation of toluene


The catalytic oxidation of toluene was studied over Mn(III) and Fe(III) Schiff base complexes supported layered double hydroxide catalysts. The supported catalysts were synthesized by intercalation method and abbreviated as LDH-[NAPABA-M], {where M = Mn(III) and Fe(III)}. The obtained material was characterized by various physical techniques such as ICP-AES, EDX, XRD, FTIR, SEM, TEM, BET surface area, EPR, and TGA. The liquid-phase catalytic oxidation of toluene was studied using LDH-[NAPABA-M]/TBHP system. A maximum conversion of toluene (55.3%) and selectivity of benzaldehyde (86.1%) was observed with LDH-[NAPABA-Mn(Cl)]/TBHP system, when the reaction is carried out at toluene to tert-butylhydroperoxide (TBHP) molar ratio 1:3, temperature 373 K, and catalyst amount, 100 mg. The catalyst, LDH-[NAPABA-Mn(Cl)] gave excellent; conversion of toluene and selectivity of benzaldehyde in comparison to LDH-[NAPABA-Fe(Cl)] catalyst. The catalyst, LDH-[NAPABA-Mn(Cl)] showed good stability and reusability up to five cycles without significant loss of catalytic activity.

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This research work is funded by University Grant Commission New Delhi, India, under the grant number UGC-RGNF: F1-17.1/2016-17/RGNF-2015-17-SC-MAD-19994/ SAIII/Website). The authors are thankful to Head, School of Chemical Sciences and UGC-DAE Consortium of Scientific Research, Devi Ahilya University Indore for providing SEM, XRD, and EDX facilities and Central Salt and Marines Chemical Research Institute (CSMCRI), Bhavnagar, Gujarat for providing BET surface area, GC-MS facilities and STIC Cochin for providing DRUV-Vis facility.

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Kirar, J.S., Khare, S. & Tiwari, N. Transition metal Schiff base complexes supported on layered double hydroxide: synthesis, characterization and catalytic activity for the oxidation of toluene. Reac Kinet Mech Cat (2021).

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  • Layered double hydroxide
  • Schiff base complex
  • Heterogeneous catalyst
  • Toluene
  • Tert-butylhydroperoxide