The Effect of Temperature and Initial Concentration on Synthesis of Ammonia Borane

Abstract

In this work, production of ammonium borane (NH₃BH₃, abbreviated as AB) was studied. In synthesis works, the effect of reaction temperature and reactive inlet material concentrations on the conversion into AB were examined. Synthesis of ammonium borane was obtained from the reaction of NaBH₄ and (NH₄)₂SO₄ in THF. As a result of parametrical experiments, it has been determined that product conversion yield is increased from 95.3 to 98.2 % and reaction period is decreased by up to 2 h and product purity value is increased up to 100 % when reaction temperature is increased from 25 to 50 °C. It has been determined that when increased amount of reactive materials is compared with stoichiometric amounts, product conversion increased but limiting agent in the reaction is determined to be NaBH_4. According to FTIR, XRD, and ¹¹B NMR analyses results, AB may be synthesized up to purity phase.