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    Preparation and Characterization of Activated Carbon from Microwave and Conventional Heated Almond Shells Using Phosphoric Acid Activation
    (Analytical Letters, 2019) İZGİ, Mehmet Sait; Gamze Saraçoğlu; Baytar, Orhan; Şahin, Ömer; Saka, Cafer
    Activated carbon production from almond shells using phosphoric acid activation agent was achieved by applying both conventional heating and microwave heating in succession. The morphology and surface properties of activated carbon were studied using thermogravimetric and differential gravimetric analysis, Fourier-transform infrared spectroscopy, scanning electron microscopy, and Brunauer–Emmett–Teller analysis. A surface area of 1128 m2/g was achieved by optimizing the microwave power (500 W), microwave application time (15 minutes), conventional heating time (45 minutes), conventional heating temperature (500 °C), and the phosphoric acid:sample ratio (0.7:1). An adsorption capacity of methylene blue of 148 mg/g and an iodine value of 791 mg/g was obtained for the prepared activated carbon.
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    γ-Al2O3 supported/Co-Cr-B catalyst for hydrogen evolution via NH3BH3 hydrolysis
    (Materials and Manufacturing Processes, 2019) İZGİ, Mehmet Sait; Saka, Cafer; Şahin, Ömer
    This assay investigates the Co-Cr-B catalyst effect supported on γ-Al2O3 to produce hydrogen (HG) from ammonia-borane hydrolysis (ABH). For characterization of this catalyst, SEM-EDX, XRD, FTIR and BET surface area analysis were performed. The maximum hydrogen generation rate (HGR) with this catalyst used for the ABH was 3260 ml min−1 g−1catalyst. The recyclability tests for the Co-Cr-B/γ-AlO3 catalyst on the ABH have maintained an activity of 68% even after four hydrolysis treatments. Also, the activation energy (Ea) obtained using the Co-Cr-B catalyst supported on γ-AlO3 for the ABH was 56.06 kJ/mol.