Browsing by Author "Acidereli, Hilal"

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Polypyrrole-Multi Walled Carbon Nanotube Hybrid Material Supported Pt Nps for Hydrogen Evolution From the Hydrolysis of Meab at Mild Conditions
(Nature Portfolio, 2019) Karatas, Yasar; Kuyuldar, Esra; Acidereli, Hilal; Gulcan, Mehmet; Sen, Fatih
Herein, we report a facile method for the preparation of polypyrrole-multi walled carbon nanotube hybrid material including Pt nanoparticles (Pt@PPy-MWCNT NPs) and the use in methylamine borane (MeAB) for hydrolysis reaction at mild conditions. The prepared catalyst of Pt@PPy-MWCNT NPs was characterized by some advanced analytical methods. The catalytic experiments showed the Pt@PPy-MWCNT NPs can catalyze MeAB in aquatic solution with high catalytical performance at mild conditions. The reaction rate of catalytic hydrolysis with Pt@PPy-MWCNT NPs was found to be -d[CH3NH2BH3]/dt = + d[H-2]/3dt = kobs[Pt@PPy-MWCNT](1.19) [MeAB](0.88). The TOF value for the hydrolysis of MeAB catalyzed with Pt@PPy-MWCNT NPs was detected to be 10234.2 1/h (170.57 1/min) which is very high compared with TOF values found for other catalysts. Enthalpy, entropy and activation energy for the hydrolysis of MeAB were calculated to be 31.57 kJ mol(-1), -119.97 J mol(-1) K and 34.27 kJ mol(-1), respectively.
Single-Walled Carbon Nanotube Supported Pt-Ru Bimetallic Superb Nanocatalyst for the Hydrogen Generation From the Methanolysis of Methylamine-Borane at Mild Conditions
(Nature Portfolio, 2019) Sogut, Eda Gokirmak; Acidereli, Hilal; Kuyuldar, Esra; Karatas, Yasar; Gulcan, Mehmet; Sen, Fatih
Several metal nanoparticle based catalysts have been synthesized for catalyzing the hydrogen production process by hydrolysis of methylamine-borane (MeAB). However, there was only one study that catalyzes the producing of hydrogen via the methanolysis of MeAB, and it was carried out by our research group. For this reason, in this work, a new catalyst system entitled by single-walled carbon nanotube (SWCNT) supported bimetallic platinum-ruthenium nanoparticles were developed and called as PtRu@SWCNT. These NPs were characterized by several techniques (XRD, XPS, Raman, and TEM), and they were performed for the methanolysis of MeAB with high catalytic activity. The prepared PtRu@SWCNT NPs were also tested in the methanolysis of MeAB at different parameters including different temperatures, catalyst and substrate concentrations, and reusability performance. Experimental results revealed that the new PtRu@SWCNT NPs had excellent catalytic activity and reusability for removing of hydrogen from the methanolysis of MeAB at ambient conditions. According to the obtained data, the turnover frequency is 136.25 mole H-2/mole PtRu x min, and the activation energy (Ea) is 17.29 kJ/mole. More than 99% of conversion was observed at room temperature.