Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Kimya Bölümü, Türkiye
Tezin Onay Tarihi: 2019
Öğrenci: Esra Sarıca
Danışman: SAİM ÖZKAR
Özet:Ruthenium(0) nanoparticles supported on bare or silica-coated magnetite are prepared by impregnation of ruthenium(Ш) ions on the surface of support followed by their reduction with aqueous solution of sodium borohydride. The materials are magnetically isolated from the reaction solution and characterized by a combination of advanced analytical techniques including ICP-OES, BET, XRD, SEM-EDS, TEM, XPS. These magnetically isolable nanoparticles are used as catalyst in hydrogen generation from the hydrolysis of ammonia borane at room temperature. Ruthenium(0) nanoparticles, supported on bare magnetite and silica-coated magnetite, are highly active catalyst providing turnover frequency values of 29 and 127 min-1 , respectively, in hydrogen generation from the hydrolysis of ammonia borane at 25 °C. Thus, coating of the surface of magnetite with silica results in a significant enhancement in catalytic activity of ruthenium(0) nanoparticles in hydrogen generation from the hydrolysis of ammonia borane. Ruthenium(0) nanoparticles, supported on the silica coated magnetite, are also highly reusable as they preserve their initial catalytic activity even after the fifth reuse in hydrogen generation from the hydrolysis reaction