Browsing by Author "Toprak, Neslihan Erat"

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Efficient Hydrogen Production via Hydrolysis of NaBH4 by the Co/Co3O4-Cu2O-ZnO Catalyst Prepared Using Mixed Metal Oxides as Support Material
(Springer Heidelberg, 2024) Toprak, Neslihan Erat; Ozer, Abdulkadir; Bozkurt, Gamze
In this study, we investigate for the first time the catalytic activity of the Co/Co3O4-Cu2O-ZnO catalyst in hydrogen production from the hydrolysis of NaBH4. After the Co3O4-CuO-ZnO support material was synthesized by the chemical precipitation method, the impregnation method was used to dope Co on the support material. Morphological and structural analyses of the Co/Co3O4-Cu2O-ZnO catalyst were investigated by XRD, XPS, SEM, TEM, and BET methods. Then, activity tests of the catalyst were performed in an H-2 generation system. The hydrogen generation rate (HGR) of the Co/Co3O4-Cu2O-ZnO catalyst was found 4698 ml min(-1) gcat(-1) at 25 degrees C. After the HGR measurements at 25, 35, 45, and 55 degrees C the activation energy of the Co/Co3O4-Cu2O-ZnO catalyst was calculated as 28.05 kJ mol(-1). In addition, the HGR value had reached a high value such as 12,920 ml min(-1) gcat(-1) at 55 degrees C.
Superior Catalytic Activity of Co-B/Co3O4 Catalyst for Hydrogen Generation from Sodium Borohydride
(Pergamon-Elsevier Science Ltd, 2025) Toprak, Neslihan Erat; Bozkurt, Gamze; Ozer, Abdulkadir
Hydrogen is an important energy carrier. For this reason, studies on hydrogen production and storage are increasing day by day. This study synthesized an effective Co-B/Co3O4 catalyst for hydrogen generation from sodium borohydride. The effect of the calcination temperature of Co3O4 used as support material on the hydrogen generation rate was investigated. In this context, four different calcination temperatures were tested at 300, 400, 500 and 600 degrees C. It was observed that the highest hydrogen generation rate was obtained from the support material calcined at 500 degrees C. The obtained Co-B/Co3O4 catalyst exhibited superior catalytic activity and the hydrogen generation rate was calculated as 10,336 ml min-1 g cat -1 at 25 degrees C. Additionally, the effects of different solution temperatures on the hydrogen generation rate were investigated. The hydrogen generation rate was 25,840 ml min-1 g cat -1 when the solution temperature was 55 degrees C. In reusability experiments, it was observed the preservation rate of the catalyst remained at 71% of its initial catalytic activity after 5 cycles.