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- W4308789049 abstract "A series of copper-doped strontium ferrites with a perovskite structure, SrFe 1-x Cu x O 3-δ ; x = 0–0.45 (SFCx), were successfully prepared via a combustion synthesis reaction method using hexamine as fuel followed by heat treatment at 1000°C for 3h. The obtained SFCx materials were characterized using various analytical and spectroscopic techniques. X-ray diffraction patterns of the perovskite exhibited a cubic structure with a Pm-3m (221) space group. The presence of Fe 4+ , Fe 3+ , Cu 2+ , Cu + , and oxygen vacancies was confirmed via X-ray photoelectron spectroscopy. The formation of nanoparticles was confirmed by scanning electron microscopy images of the perovskite phase. The surface area was investigated using the Brunauer–Emmett–Teller method. SFCx materials were systematically evaluated for catalytic hydroxylation of anisole using hydrogen peroxide, an environmentally benign oxidant, and acetonitrile as solvent. Effects of various reaction parameters, such as the catalyst concentration, H 2 O 2 /substrate molar ratio, solvent, reaction temperature, and time, were thoroughly studied. A maximum anisole conversion (76.9 %) with 62.5 % of guaiacol selectivity was observed in the presence of the SFC0.45 catalyst at 80°C for 6 h using H 2 O 2 as an oxidant. The proposed hydroxyl radical mechanism for catalytic hydroxylation of anisole is well supported by EPR studies, where the quenching of signal corresponds to paramagnetic Cu(II) species by the introduction of hydrogen peroxide. Catalytic test results suggest that the synergistic effect of copper and oxygen vacancies facilitates anisole hydroxylation. ➢ Cu-doped strontium ferrites (SrFe 1-x Cu x O 3-δ ; x = 0–0.45; SFCx), were prepared by a combustion synthesis. ➢ SFCx exhibited a cubic perovskite structure with a Pm-3m (221) space group. ➢ SFCx showed good activity for hydroxylation of anisole using hydrogen peroxide ➢ Anisole conversion of 76 % with 62 % of guaiacol selectivity was observed ➢ The reaction follow first-order kinetics and proceed through the radical pathway." @default.
- W4308789049 created "2022-11-15" @default.
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- W4308789049 date "2023-03-01" @default.
- W4308789049 modified "2023-09-29" @default.
- W4308789049 title "Combustion synthesis of copper-doped perovskite SrFe1-xCuxO3-δ nanomaterials and its potential application on hydroxylation of anisole, a biomass model component" @default.
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- W4308789049 doi "https://doi.org/10.1016/j.mtsust.2022.100266" @default.
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