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    Studies on catalytic behavior of co–cr–b/al2 o3 in hydrogen generation by hydrolysis of nabh4
    (S.C. Virtual Company of Phisics S.R.L, 2019) Izgi, M.S.; Baytar, O.; Şahin, Ö.; Horoz, S.
    In this present study, the chemical reduction technique was used to synthesize Al2O3 supported Co-Cr-B catalyst (Co-Cr-B/Al2O3). The effects of the concentration of NaBH4, NaOH, amount of catalyst, ratio of metal/ Al2 O3and temperature were discussed in detail. The results show that the reaction rate of hydrolysis first rises up and then goes down subsequently with the increase of NaBH4 concentration, as well as the concentration of NaOH. It was observed that the hydrogen generation rate increases with the molar content of metal changing from 2.5% to 5 wt%. However, when the metal/Al2O3 molar ratio is located from 5% to 20 wt%, the rate of hydrogen generation goes down. The hydrolysis kinetic order and the activation energy (EE ) of NaBH4 in the presence of Co-Cr-B/Al2O3 catalyst were found as 0.15 and 37.34 kJ*mol-1, respectively. According to the results obtained, Co-Cr-B/Al2O3 catalyst can be used as a promising material in PEMFC mobile systems. © 2019, S.C. Virtual Company of Phisics S.R.L. All rights reserved.
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    Synthesis of an efficient photocatalyst (Activated carbon supported zns) for methylene blue degradation
    (S.C. Virtual Company of Phisics S.R.L, 2020) Zörer, C.; Baytar, O.; Şahin, Ö.; Horoz, S.; Izgi, M.S.
    In the present study, activated carbon (AC) supported ZnS catalysts at different concentrations of AC were synthesized using hydrothermal method. The MB photocatalytic degradation efficiency of AC supported ZnS catalysts at different concentrations of AC was examined in the presence of UV-C lamp. As a result of photocatalytic measurements, the catalyst having the best photocatalytic activation was determined. The effect of different parameters, such as the amount of catalyst and dye concentration, on the photocatalytic degradation of methylene blue was investigated in the presence of this catalyst.Moreover, The photocatalytic degradation kinetics of methylene blue in the presence of catalyst were investigated by first and second order kinetic model. In the last part of the study, structural, morphological and elemental properties of the catalyst having the best photocatalytic activity were examined by x-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive x-ray (EDX)measurements, respectively. © 2020, S.C. Virtual Company of Phisics S.R.L. All rights reserved.
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    The effect of microwave irradiation on a Co-B-based catalyst for hydrogen generation by hydrolysis of NaBH4 solution
    (Bellwether Publishing, Ltd., 2015) Şahin, O.; Kaya, M.; Izgi, M.S.; Saka, C.
    A Co-B-based catalyst was prepared under microwave irradiation for hydrogen generation by hydrolysis of NaBH4 solution. The activity of Co-B catalyst for hydrogen generation was studied in comparison with another Co-B catalyst prepared by the known methods. The results show that Co-B catalyst reduced prepared under microwave irradiation was quick and was completed in only 17 min, while the Co-B catalyst produced in a known method was slow and was completed in 27 min. The hydrogen generation from the hydrolys of NaBH4 with Co-B catalyst was investigated depending on NaBH4 and NaOH concentrations in solution, temperature, microwave applying time, and microwave applying power. Hydrolysis kinetics of NaBH4 were investigated at a temperature range of 30-50°C and zero-order kinetics were applied to the obtained data. Copyright © Taylor & Francis Group, LLC.