Browsing by Author "ALABLAQ, Salha M."
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thesis.listelement.badge PREPARATION OF COPPER NANOPARTICLES ADDED POLYTHIOPHENE FOR DEHYDROGENATION OF AMMONIA BORANE(2017-06-02) ALABLAQ, Salha M.; KAYA, MuratNanocatalyst is the material with an increased catalytic activity due to their high surface-to-volume ratio. In the case of homogeneous nanocatalysis like colloidal metal nanoparticle suspensions, they are found in the same phase with precursors used for reaction and products. The main advantage of this type of catalyst can be considered as highly selective systems compared with heterogeneous ones. But low thermal stability, serious metal contamination and difficulty recovery of the catalyst are the main disadvantages of homogeneous catalyst. In order to overcome these problems, heterogeneous type nanocatalysts are widely used in reactions. In this type of catalyst, metal nanoparticles are immobilized onto support materials like silica, alumina, and carbon based materials. Nowadays, some polymer support gained great interest due to their facile and cheap methods to produce them. Hydrogen energy is considered as one of the most important clean source. For this reason a lot of studies are performed to produce hydrogen storage materials like metal hydrides, chemical hydrides, organic molecules, metal organic frameworks and carbon nanotubes. Between these storage materials chemical hydrides has attracted great attention due to their high hydrogen storage capacity. Among the chemical hydrides, ammonia borane (AB) gained great importance because of high hydrogen content (19.6 wt %), low toxicity and high stability. With the usage of appropriate catalyst it is possible to get three moles of hydrogen per mole of AB under mild conditions. For this reason, it is so important to produce a catalyst with high-efficiency and improved kinetic parameters in the hydrolysis of AB under mild conditions for hydrogen energy applications. In this thesis, a facile way for preparing copper nanoparticle (CuNPs) supported on polythiophene as catalyst for hydrogen production from aqueous AB was presented. For this, initially polythiophene polymer support material was prepared. After that Cu (II) ions were added onto polymer support by utilizing wet impregnation method. Then copper ions were reduced by using sodium borohydride and copper nanoparticles were obtained. The catalytic activity of prepared nanocatalyst was revealed. An initial turnover frequency (TOF) value is founded as 11.8 min-1 . The stability and reuse capacity of the prepared catalyst were also investigated. The prepared catalyst shows good stability and reuse capacity. CuNPs added onto polythiophene shows nearly same activity after 5th reuse in the hydrolytic dehydrogenation of AB.