INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, cilt.38, ss.16215-16228, 2013 (SCI İndekslerine Giren Dergi)Atıf İçin Kopyala
In the present study, synthesis, structural characterization, and hydrolysis of the promising hydrogen storage carrier ammonia borane (NH3BH3), were investigated. NH3BH3 was prepared by one-pot chemical reaction between sodium borohydride (NaBH4) and different ammonia salts [NH4X, X: SO4, CO3, Cl] in the presence of solvent, tetrahydrofurane (THF). Synthesizes with different temperatures (20-40 degrees C), reaction times (30-130 min), amount of added THF volume (50-200 ml) and NaBH4/(NH4)(2)SO4 input molar ratios (0.47-0.75) were performed in order to find the optimum reaction conditions for obtaining maximum product yield. The characterization of NH3BH3 products was carried out by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy (RS), elemental analysis (C, H, N, O) and NMR spectroscopy. Characterization results indicated that NH3BH3 as a crystalline powder at 98% purity was achieved with 92.18% production yield. Additionally, hydrolysis of product NH3BH3 in the presence of amorphous Co-B catalyst at 22-80 degrees C under magnetic stirring (700 rpm) was performed. The maximum hydrogen generation rate was 5447.80 ml min(-1) g cat(-1) and the hydrolysis reaction kinetics were clarified based on zero-order, first-order and Langmuir-Hinshelwood kinetic models. Copyright (c) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.