Modelling on Catalytic Dehydrogenation of NaBH4 by Hydrogel Based CoF2 Catalyst
In this paper, dehydrogenation of sodium borohydride (NaBH4) was performed in the presence of hydrogel catalyst. CoF2 was used as metal source to prepare Co-ion loaded poly(acrylamide-co-acrylic acid) hydrogel. Dehydrogenation reactions were carried out under three different reaction temperatures, 25, 35 and 45°C. It was determined that the dehydrogenation reaction time decreases significantly with an increase in temperature. The reactions took place within 27, 18 ve 9 hours at 25, 35 and 45 °C, respectively. On the other hand, the yield of the dehydrogenation reaction did not change with temperature and was calculated as 90%. In addition, the relation between an initial concentration of NaBH4 and released hydrogen was investigated at 45°C. The rate constants and activation energy of the reaction were determined by means of zero order kinetic expression and graph of lnk versus 1/T, respectively. The activation energy was found as 43.82 kJ/mol and seen compatibility with literature. Furthermore, the pre-exponential factor (A) presented in Arrhenius equation was calculated as 5.38×10-3 mol L– min–. Dehydrogenation index of NaBH4 was calculated as 2526.31 ml H2/g NaBH4 according to the amount of NaBH4 in the aqueous solution. Additionally, dried and swollen Co-ion loaded poly(acrylamide-co-acrylic acid) hydrogel catalyst was used to produce hydrogen from NaBH4. The effect of this was investigated to determined reaction time and amount of released hydrogen. It was demonstrated that dehydrogenation of NaBH4 could be controllable according to the reaction temperature and state of the catalyst as mentioned.
1983 yılında Ankara’da doğan Tuğba AKKAŞ BOYNUEĞRİ, 2007 yılında Gazi Üniversitesinde lisans eğitimi ardından 2011 yılında İstanbul Teknik Üniversitesinde yüksek lisans ve 2016 yılında Gazi Üniversitesinde doktora eğitimini tamamlamıştır. 2011 yılından beri ETİMADEN İşletmeleri Teknoloji Geliştirme Dairesi Başkanlığında çalışmakta olup Teknik Uzman olarak görevine devam etmektedir.