کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
64628 48363 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Heterogeneous catalysts hold the edge over homogeneous systems: Zeolite-Y encapsulated complexes for Baeyer-Villiger oxidation of cyclohexanone
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Heterogeneous catalysts hold the edge over homogeneous systems: Zeolite-Y encapsulated complexes for Baeyer-Villiger oxidation of cyclohexanone
چکیده انگلیسی


• Heterogenization of M(II/IV) complexes within zeolite-Y by Flexible-Ligand method.
• Characterization of synthesized materials with ICP-OES, BET, XRD, IR, UV–vis, TGA.
• B-V oxidation of cyclohexanone over neat and zeolite-Y encapsulated complexes.
• The effect of reaction parameters on substrate conversion was also tested.
• [VO(pamp)]-Y exhibited eventual performance by providing 1500 TONs.

A series of heterogeneous catalysts [M(pamp)]-Y (Where, M = V, Mn, Fe or Cu; pamp = 2,2′-((1E,1′E)-(1,2-phenylenebis(azanylylidene))bis(methanylylidene))diphenol) was prepared by encapsulation of metal complexes within zeolite-Y. Synthesized materials were characterized by chemical, BET and thermogravimetric (TG) analysis, X-ray diffraction (XRD), UV–vis and infrared spectroscopies, and scanning electron microscopy (SEM). Zeolite-Y encapsulated complexes were tested in Baeyer-Villiger (B-V) oxidation of cyclohexanone beside neat complexes to check the aptitude of heterogeneous catalysis over the homogeneous system. The effect of experimental variables viz., solvents, catalysts amount, the mole ratio of substrate to an oxidant, temperature and reaction time on substrate conversion was also tested. Under the optimized reaction conditions, [VO(pamp)]-Y was found to be a potential candidate by providing 1500 TONs in cyclohexanone oxidation, and the selectivity towards ε-caprolactone was 85.2%.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 421, September 2016, Pages 178–188
نویسندگان
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