Yazar "BAYTAR, Orhan" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    STUDIES ON CATALYTIC BEHAVIOR OF Co–Cr–B/Al2O3 IN HYDROGEN GENERATION BY HYDROLYSIS OF NaBH4
    (Digest Journal of Nanomaterials and Biostructures, 2019-10-04) İZGİ, M. Sait; BAYTAR, Orhan; ŞAHİN, Ömer; HOROZ, Sabit
    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/ Al2O3and 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 (????) 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.
  • Küçük Resim
    Öğe
    SYNTHESIS ZTO NANOPARTICLES AND STUDY OF THEIR PHOTOCATALYTIC PROPERTIES
    (Journal of Ovonic Research, 2019-03-25) BULUT, Nesrin; BAYTAR, Orhan; ŞAHİN, Ömer; HOROZ, Sabit
    Nanosized zinc tin oxide (ZTO, Zn2SnO4) photocatalysts were prepared with a hydrothermal technique and their structural and optical properties were characterized by performing powder x-ray diffraction (XRD), ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopies, respectively. The XRD results indicated that the ZTO nanoparticles have a face-centered cubic spinel structure and the average crystallite size was calculated as 18.75 nm by using the Debye–Scherrer equation. The band gap of ZTO nanoparticles was determined as 3.87 eV which is higher than that of bulk ZTO (3.6 eV). The effect of some parameters (amount of dye, amount of catalyst and temperature) were studied on the photocatalytic activity of ZTO nanoparticles. The obtained all results revealed that ZTO nanoparticles can be used as promising photocatalysts for degradation methyl-blue (MB) (dye). Moreover, it was determined that photocatalytic degradation kinetics of dye at all temperatures are better matched to the first order kinetic model.