With the increasing trend towards the use of renewable energy and the encouragement of international agreements due to environmental effects, the world tends to provide the energy it needs from renewable sources. Hydrogen is an environmentally friendly energy carrier that is produced from various energy sources and can be a sustainable solution to energy needs. Catalyst evaluation studies are carried out in studies that release high purity hydrogen by hydrolysis of metal hydrides such as sodium borohydride (NaBH4), and potassium borohydride (KBH4). In this study, Al2O3 supported Ni catalysts were synthesized by the impregnation method and the catalysts were characterized by applying X-Ray Diffractometry (XRD), X-Ray Fluorescence (XRF), Scanning Electron Microscopy (SEM), and Brunauer-Emmett-Teller (BET) methods. The performance of the catalysts was evaluated in the production of hydrogen by the hydrolysis of sodium borohydride. The influences of reaction temperature (20, 40, and 60 °C) and Ni content of the catalyst (20, 30, and 40 %) on the hydrolysis reaction was investigated under experimental conditions of 100 mg NaBH4, 100 mg catalyst, 5 mL 0.25 M NaOH. The highest hydrogen yield (100%) and hydrogen production rate (364.3 mL/gcat.min) was obtained with 40% Ni/Al2O3 catalyst at 60 °C reaction temperature.
Hydrogen is at a good level among all energy sources as a clean, renewable and sustainable energy source. Hydrogen has high energy intensity, an ideal energy carrier for the environment with zero emission and can be produced in a controlled way by selecting suitable catalysts from metal hydrides having a high content of hydrogen among the other production methods. In this study commercial (Ru/C) and synthesized (Ni/TiO 2) catalyst was used in order to produce hydrogen from sodium borohydride. The activities of the synthesized catalysts were examined in the hydrolysis reaction and the results compared with the commercial catalyst. The effect of reaction parameters such as temperature and time, the amount of catalyst and the loading ratio of Ni on the support material on the hydrolysis reaction was examined.
Hydrogen is an environmentally friendly energy carrier that can be a sustainable solution to the increasing energy demand, produced from renewable energy sources. For the storage and transmission of hydrogen, metal borohydrides stand out with their hydrogen storage capacities. In this study, Pd/TiO2 catalyst was synthesized by sol-gel method and characterized by X-Ray Diffractometry (XRD), Brunauer, Emmett-Teller (BET), X-Ray Fluorescence (XRF), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX) techniques. The activity studies of the synthesized catalyst were carried out in the hydrolysis reaction of NaBH4 to produce hydrogen. Experimental studying conditions were determined as 100 mg NaBH4, 100 mg catalyst, 5 mL 0.25 M NaOH and three different reaction temperature parameters (20, 40 and 60 o C) were tested. The highest hydrogen yield (100%) and hydrogen production rate (102 mL/gcat.min) were obtained at 60 o C reaction temperature. In the reusability tests of the catalyst, a decrease in activity was observed after the first 4 uses. By applying the nth order reaction kinetics model to the NaBH4 hydrolysis reaction, the reaction rate degree was determined to be 0.7. The activation energy was calculated as 33.23 kJ/mol with the Arrhenius equation.
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