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Updated: Jun 5, 2025
Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
Published on: August 7, 2018
Manganese salophen covalently anchored to amino-functionalized graphene oxide as an efficient heterogeneous catalyst
Robabeh Hajian1, Narjes Sadat Mousavi1
1Department of Chemistry, Yazd University Yazd 89195-741 Iran rhajian@yazd.ac.ir +98-353-8210644 +98-353-31232822.
Abstract:
Epoxidation of olefins catalyzed by manganese(iii) salophen (MnSalop) immobilized on graphene oxide (GO) modified with 3-aminopropyltrimethoxysilane (GO·NH2) has been reported. Characterization of the solid catalyst by FTIR, DR UV-Vis, FESEM, XRD, elemental scanning mappings, TGA/DTG, BET measurements, and ICP analysis aided in understanding the catalyst morphology. It confirmed that there was no significant demetallation or chemical change in MnSalop-GO·NH2. The heterogeneous catalyst (MnSalop-GO·NH2) showed high efficiency in the oxidation of different olefins with H2O2 as a green oxygen donor agent assisted by NaHCO3 as co-catalyst at room temperature. The alkenes were oxidized to their corresponding epoxides with 88-100% selectivity and turnover frequency (TOF) values ranging from 40.7 to 162.8 h-1 in the presence of MnSalop-GO·NH2 under mild conditions. When supported on GO, MnSalop-GO·NH2 afforded epoxide yields comparable to those of the corresponding homogeneous analog. The prepared catalyst was selective for most olefins, with a high conversion. In addition, it could be reused four times without any remarkable loss in catalytic performance.
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