1403/01/10
روشن خوشنوازی

روشن خوشنوازی

مرتبه علمی: دانشیار
ارکید:
تحصیلات: دکترای تخصصی
اسکاپوس: 6506671795
دانشکده: دانشکده علوم پایه
نشانی: دانشگاه کردستان-دانشکده علوم پایه گروه شیمی
تلفن:

مشخصات پژوهش

عنوان
Heteropolytungstostannate as homo- and heterogeneous catalysis for Knoevenagel condensations, selective oxidation of sulfides and oxidative amination of aldehydes
نوع پژوهش
مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها
polyoxometalates, nanocatalyst,
سال 1396
مجله RSC advances
شناسه DOI
پژوهشگران روشن خوشنوازی ، لیلا بهرامی ، منوچهر رضایی

چکیده

Heteropolytungstostannate K11H[P2W18O68(HOSnIVOH)3]$20H2O (1) is used as a homo- and heterogeneous catalyst for Knoevenagel condensations. New Fe3O4@SiO2@CH2(CH2)2NH3 +- [P2W18O68(HOSnIVOH)3]11- nanocatalyst was fabricated through electrostatic grafting of (1) on aminemodified silica-coated magnetic nanoparticles. The new magnetically recoverable nanocatalyst was characterized using infrared spectroscopy (IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffractometry (XRD), energy-dispersive X-ray analysis (EDX) and alternating gradient force magnetometry (AGFM). The results indicate that the particles are mostly spherical in shape and have an average size of approximately <30 nm. The catalytic activity of the catalyst was investigated in the selective oxidation of sulfides to sulfoxides and oxidative amination of aldehydes in an aqueous medium. The catalyst was reused at least five times without significant decrease in catalytic activities, and the structure of the catalyst remained unchanged after recycling.