Volume 6 - No. 4

اکسایش بنزیل الکل به بنزآلدهید تحت شرایط بدون حلال با استفاده از نانوذرات مخلوط روتنیوم-سریم اکسید

بهزاد آقابراری و زهرا افضلی

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چكيده     در این مطالعه، ترکیب سریم اکسید و مخلوط روتنیوم- سریم اکسید با استفاده از روش رسوب‎گذاری در محیط قلیایی و نانوذرات مخلوط روتنیوم- سریم اکسید با استفاده از روش مایسل معکوس سنتز گردیدند. تمامی نمونه‎ها با استفاده از روش‎های XRD و BET شناسایی گردیدند. اندازه نانوذرات به¬دست آمده با استفاده از تصاویر TEM اندازه¬گیری گردید. در مرحله بعد فعالیت کاتالیزوری نمونه‎های سنتزی در واکنش اکسایش بنزیل الکل در حضور اکسیژن مولکولی و تحت شرایط بدون حلال مورد بررسی قرار گرفت. نتایج به¬دست آمده نشان داد نانوکاتالیزور سنتز شده بهترین گزینه در واکنش اکسایش بنزیل الکل به بنزآلدهید می¬باشد. هم¬چنین عوامل موثر بر واکنش مانند دمای واکنش، مقدار کاتالیزور و مدت زمان واکنش جهت رسیدن به بالاترین درصد تبدیل بنزیل الکل بهینه گردیدند. تحت شرایط بهینه بالاترین درصد تبدیل بنزیل الکل 99 درصد با گزینش¬‎پذیری 94 درصد برای محصول بنزآلدهید در حضور نانوذرات مخلوط روتنیوم- سریم اکسید در دمای 80 درجه سانتی-گراد و مدت زمان سه ساعت به‎دست آمد.

كلمات كليدي    بنزیل الکل، اکسایش بدون حلال، بنزآلدهید، نانوذرات مخلوط روتنیوم- سریم اکسید، مایسل معکوس.

Solvent Free Oxidation of Benzyl Alcohol to Benzaldehyde over RuO2/CeO2 Nano-Mixed Oxide

Behzad Aghabarari and Zahra Afzali

Abstract    In this study, Ce oxide and Ru-Ce mixed oxide were prepared by co-precipitation method in alkaline media. Also, the Ru-Ce mixed oxide nanoparticles were synthesized by a reverse micelle approach. All of the samples were characterized with XRD and BET methods and the size of nanoparticles synthesized in the reverse micelle was measured by the TEM technique. The catalytic activities of synthesized samples were investigated for oxidation of benzyl alcohol in the presence of molecular oxygen and solvent free condition. The obtained results show that the nano-catalyst is suitable candidates for the oxidation of benzyl alcohol to the benzaldehyde. In order to obtain maximum conversion of benzyl alcohol, the reaction parameters, like reaction temperature, amount of catalyst and reaction time, were optimized. Under the optimized conditions, a maximum of 99%benzyl alcohol conversion and 94 % selectivity for benzaldehyde was achieved with Ru-Ce nano mixed oxide as catalyst, at 80 oC and 3h.

Keywords    Benzyl alcohol, Solvent free oxidation; Benzaldehyde, Nanoparticles Ru-Ce mixed oxide; Reverse micelle.



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