دانلود مقاله با موضوع اکسیداسیون انتخابی الکل های بنزیل با اکسیژن مولکولی
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موضوع به انگلیسی:Selective oxidation of benzyl alcohols with molecular oxygen as the oxidant
using Ag-Cu catalysts supported on polyoxometalates
بخشی از متن:We report an efficient process for the oxidation of benzyl alcohols using molecular oxygen as the oxidant
catalyzed by Ag-Cu catalysts supported on polyoxometalates (Ag-Cu/POM). The Ag-Cu/POM catalyst was prepared
by galvanic displacement in the presence of polyvinyl pyrrolidone and polyethylene glycol. The catalysts
were characterized using Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy
(UV–Vis), powder X-ray diffraction (PXRD), X-ray fluorescence (XRF), Brunauer-Emmett-Teller (BET) surface
analysis, transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and thermogravimetric
analysis (TGA). The oxidation reaction was carried out using a Schlenk– line setup, under ambient atmospheric
pressure. Reaction products were identified by GC–MS and quantified with GC using an internal standard
method. The Ag-Cu/POM catalyst gave close to 100% benzyl alcohol conversion in 5 h with >99% selectivity to
benzaldehyde. When tested on various benzyl alcohol derivatives the Ag-Cu catalysts showed good conversions
and >99% selectivity to the corresponding aldehydes. The Ag-Cu catalysts supported on the POM are highly
stable, and don’t show tendency to leach or deactivate. The catalysts are heterogeneous in nature and easy to
recover after reactions, and could be reused at least 5 times without significant loss in activity and s
