NaBH_4 GEOPOLYMER COMPOSITES

摘要

NaBH_4 salt can easily be solved in sodium aluminate and silicate solutions. Brought together reveal recrystallization of NaBH_4 crystals enclosed and protected in a geopolymer type matrix without any loss of the NaBH_4 input. A fully controllable, catalyst free hydrogen release is achieved by the addition of acidic solution at room temperature. The composite can be optimized releasing up to 80 % of the amount obtained for pure NaBH_4 in the reaction with H_2O, i.e. a total content of 10 wt% or 2 l H_2 per gram BH_4-containing gel can be received.