Akademik Veri Yönetim Sistemi
International Journal of Hydrogen Energy, cilt.45, ss.27098-27113, 2020 (SCI-Expanded)
Hydrous hydrazine (H2NNH2 center dot H2O, HH) is taken notice to be one of the promising hydrogen storage materials for the future due to its high hydrogen content of 7.9% wt. In this study, we develop a new catalytic material formed from trimetallic NiRuPt alloy nanoparticles decorated on silica support (NiRuPt/SiO2) for the hydrogen production via selective decomposition of HH under mild reaction conditions. NiRuPt/SiO2 catalyst was prepared by wet-impregnation technique in water at room conditions and characterized by the various spectroscopic/analytical tools. The sum of their results is revealing that the formation ternary NiRuPt alloy (d(mean) = 6.4 nm) nanoparticles on the surface of SiO2. The prepared new catalytic system eases the selective hydrogen production from decomposition of HH in aqueous alkaline solution with high activity (324.1 min(-1)) and conversion (>99%) at 333 K. Furthermore, painless recovery plus high durability of these supported NiRuPt nanoparticles against to agglomeration and leaching make them recyclable catalyst so that they retain >70% of their activity at 5th reuse and the ex-situ generated NiRuPt/SiO2 catalyst was found to provide total turnover number (TTON) 4181 in the complete decomposition of HH over 11.4 h before deactivation in the complete decomposition of HH. The studies addressed herein also includes the collection of kinetic records for NiRuPt/SiO2 catalyzed decomposition of HH in alkaline solution depending on catalyst [NiRuPt], substrate [H2NNH2 center dot H2O], promoter [NaOH] concentrations and temperature to determine the rate expression and the activation parameters (Ea, Delta H#, and Delta S#) of the catalytic reaction. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.