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Preparation of Copper Nanoparticles Added Polythiophene For Dehydrogenation Of Ammonia Borane

Oluşturulma Tarihi: 18-07-2017

Niteleme Bilgileri

Tür: Tez

Alt Tür: Yüksek Lisans Tezi

Yayınlanma Durumu: Yayınlanmamış

Dosya Biçimi: PDF

Dil: İngilizce

Konu(lar): Kimya mühendisliği,

Yazar(lar): Alablaq, Salha (Yazar),

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

Anahtar Kelimeler

supported catalyst, metal nanoparticles, polymer support, hydrogenenergy, ammonia borane


Özet

Nanocatalyst is the material with an increased catalytic activity due to their highsurface-to-volume ratio. In the case of homogeneous nanocatalysis like colloidalmetal nanoparticle suspensions, they are found in the same phase with precursorsused for reaction and products. The main advantage of this type of catalyst can beconsidered as highly selective systems compared with heterogeneous ones. But lowthermal stability, serious metal contamination and difficulty recovery of the catalystare the main disadvantages of homogeneous catalyst. In order to overcome theseproblems, heterogeneous type nanocatalysts are widely used in reactions. In this typeof catalyst, metal nanoparticles are immobilized onto support materials like silica,alumina, and carbon based materials. Nowadays, some polymer support gained greatinterest due to their facile and cheap methods to produce them.Hydrogen energy is considered as one of the most important clean source. For thisreason a lot of studies are performed to produce hydrogen storage materials likemetal hydrides, chemical hydrides, organic molecules, metal organic frameworks andcarbon nanotubes. Between these storage materials chemical hydrides has attractedgreat attention due to their high hydrogen storage capacity.vAmong the chemical hydrides, ammonia borane (AB) gained great importancebecause of high hydrogen content (19.6 wt %), low toxicity and high stability. Withthe usage of appropriate catalyst it is possible to get three moles of hydrogen permole of AB under mild conditions. For this reason, it is so important to produce acatalyst with high-efficiency and improved kinetic parameters in the hydrolysis ofAB under mild conditions for hydrogen energy applications.In this thesis, a facile way for preparing copper nanoparticle (CuNPs) supported onpolythiophene as catalyst for hydrogen production from aqueous AB was presented.For this, initially polythiophene polymer support material was prepared. After thatCu (II) ions were added onto polymer support by utilizing wet impregnation method.Then copper ions were reduced by using sodium borohydride and coppernanoparticles were obtained. The catalytic activity of prepared nanocatalyst wasrevealed. An initial turnover frequency (TOF) value is founded as 11.8 min-1. Thestability and reuse capacity of the prepared catalyst were also investigated. Theprepared catalyst shows good stability and reuse capacity. CuNPs added ontopolythiophene shows nearly same activity after 5th reuse in the hydrolyticdehydrogenation of AB.


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