Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2019
Thesis Language: Turkish
Student: ŞAHİKA ÖZEL ŞAHİN
Supervisor: NURAY OKTAR
Abstract:The population of the world is increasing dramatically so also needing of the energy is increasing day by day. Because fossil fuels are from non-renewable energy sources and lead to carbon dioxide emissions that cause greenhouse effect, researchers have focused on alternative renewable and clean energy sources. Hydrogen is environment-friendly and sustainable energy source so hydrogen energy has become an important research area worldwide. With in the scope of this study, alumina supported different metal (Co, Ni and Mg) catalysts, which can be used in the acetic acid reforming reactions, were prepared. Mesoporous alumina material was synthesized by sol-gel method and metals (Co, Ni and Mg) were impregnated into the structure of the alumina. XRD, N2 adsorption-desorption, ICP-MS, SEM and TGA-DTA analyzes were performed to determine some physicochemical properties of the synthesized catalysts. The activity test results showed that the bi-metallic 4Ni-1Co@SGA catalyst showed high and stable activity in steam reforming of acetic acid, giving a high hydrogen selectivity at 750°C. Co catalyst showed less performance than bi-metallic Ni-Co catalysts, yielding more methane production and coke deposition. Activity of Ni catalysts was decreased by Co incorporation high reaction temperature of 750°C in terms of AcOH conversion; however, was improved by Co incorporation low reaction temperature of 550°C in terms of AcOH conversion and H2 selectivity. The coke resistance of the catalyst and further, among the bi- and tri-metallic catalysts was enhanced by Mg incorporation, the lowest coke deposition was obtained 4Ni-1Co-3Mg@SGA catalyst at 750oC.