کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
67473 48484 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Catalytic epoxidation of α-pinene with molecular oxygen using cobalt(II)-exchanged zeolite Y-based heterogeneous catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Catalytic epoxidation of α-pinene with molecular oxygen using cobalt(II)-exchanged zeolite Y-based heterogeneous catalysts
چکیده انگلیسی

Cobalt cation-exchanged zeolite Y-based catalysts were studied for epoxidation of α-pinene with molecular oxygen in 20–100 psi pressure range using N,N-dimethylformamide (DMF) as a solvent at 373 K. The catalysts characterization with X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS) suggests that cobalt introduced into faujasite zeolite exists in Co(II) state and catalyzes the epoxidation of α-pinene with molecular oxygen. The alkali and alkaline earth metal co-exchanged with Co(II) gives higher conversion than Co(II) alone. Effect of temperature and pressure was also studied to determine the optimum conditions for the reaction. The best results were obtained using NaCsCoY20 with 47% α-pinene conversion and 61% epoxide selectivity at 80 psi pressure and 373 K. Solvent was observed to play important role in epoxidation of α-pinene, and best results were observed in N,N-dimethylformamide as a solvent. Free radical mechanism has been proposed for the epoxidation of α-pinene.

Cobalt-exchanged zeolite Y-based catalysts were studied for epoxidation of α-pinene with molecular oxygen using N,N-dimethylformamide (DMF) as a solvent at 373 K. The alkali and alkaline earth metal co-exchanged with cobalt Co(II) gives higher conversion than cobalt(II) alone. The best results were obtained using NaCsCoY20 with 47% α-pinene conversion and 61% epoxide selectivity at 80 psi pressure and 373 K temperature.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 277, Issues 1–2, 16 November 2007, Pages 72–80
نویسندگان
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