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HYDROGEN PRODUCTION FROM AMMONIA BORANE BY USING PALLADIUM-NICKEL BIMETALLIC NANOPARTICLES SUPPORTED ON SILICA COATED-COBALT FERRITE MAGNETIC NANOPARTICLES

Oluşturulma Tarihi: 16-11-2016

Niteleme Bilgileri

Tür: Tez

Alt Tür: Yüksek Lisans Tezi

Yayınlanma Durumu: Yayınlanmamış

Dosya Biçimi: PDF

Dil: İngilizce

Konu(lar): Kimya,

Yazar(lar): Khalifa, Abdelmonem Mohamed (Yazar),

Emeği Geçen(ler): Kaya, Murat (Danışman),

Anahtar Kelimeler

Metal nanocatalyst, hydrogen energy, magnetic separation, ammonia borane, dehydrogenation


Özet

Due to their high activity in catalytic systems nowadays metal nanoparticles have attracted much attention. They have known as quasihomogeneous system which bridging homogenous and heterogeneous catalysis. Metal nanoparticles have high surface energy so they are not stable form larger particles in catalytic processes. Besides separation of metal nanoparticles are not easy from the reaction media. To separate them, filtration and centrifugation processes are applied. In order to get rid of the disadvantages of naked nanoparticles and to enhance the stability and to obtain reusable catalysts, immobilization of nanoparticles onto inorganic support materials are necessary.In this thesis, novel catalyst contains of palladium-nickel bimetallic nanoparticles supported on silica coated magnetic particles has been prepared. After addition of Pd2+ and Ni2+ ions on silica coated cobalt ferrite magnetic support, bimetallic nanoparticles formed by reduction of the Pd2+ and Ni2+ ions with NH3BH3 on the surface of silica coated magnetic support materials.vThe characterization of nanocomposite catalysts were done by inductively coupled plasma/optical emission spectrometry (ICP-OES), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), high resolution- transmission electron microscopy (HR-TEM) and N2 adsorption–desorption technique. Palladium-Nickel bimetallic nanoparticles supported on silica coated cobalt ferrite (PdNiNPs/SiO2-CoFe2O4) provide an initial turnover frequency (TOF) of 197 min-1 at room temperature. Another important advantage of such catalyst system is that, catalysts can be collected with an external magnet in the reactor wall and they can be reused without losing activity and sample lost.


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