Abstract
Sodium borohydride (NaBH4) is a safe and practical way of storing hydrogen due to its high hydrogen capacity (10.6% wt). NaBH4 is synthesized from different boron minerals by the thermal-chemical reactions. Constitution of by-product is little demand in NaBH4 production process, because of requirements of its reuse or disposal issues. It is important to known the mineralogical properties of byproduct for its disposal or reusing. In our study we investigated of characterization of by-products which were obtained from NaBH4 production is based on the conversion reaction of borosilicate glass under high and low hydrogen pressure process (HPP-LPP) by XRD analysis. The XRD analysis was carried out at an ambient temperature by using Philips Panalytical X'Pert-Pro diffractometer in a range of diffraction angle from 10 to 90 with CuK radiation =0.15418 mm at operating parameters of 40 mA and 45 kV with step size 0.02 and speed of 1 /min. According to the X-ray powder diffraction data, four crystal phases, Na2SiO3 (PDF Number: 00-016-0818), Na2SiO3.5H2O (PDF Number: 00-003-0433), Na2SiO3.6H2O (PDF Number: 00-018-1246) and Na8Si(Si6O18) (PDF Number: 01-088-1229) were defined for each by-products HPP BP and LPP BP obtained via HPP and LPP, respectively. By comparison XRD results of by-products were obtained under high and low hydrogen pressure processes, there are same crystallographic properties have been detected.