BASIC RESEARCH ON GEOPOLYMER GELS FOR PRODUCTION OF GREEN BINDERS AND HYDROGEN STORAGE

摘要

Geopolymer gels could be optimized for binders, possessing high mechanical strength. Two further applications will be reported. Firstly NaBH_4 crystals can be recrystallized within a geopolymer type matrix. The compositions and solidification conditions could be optimized, obtaining an hydrogen release of about 72 wt% of pure NaBH_4. The hydrogen release is obtained by acid titration without the requirement of any catalyst. Secondly sodalites of micro- and nano-crystalline sizes could be synthesized, enclosing the BH_4-anion in the cages. The crystals share extended contributions of a geopolymer type matrix. The matrix stores and transports the water molecules for the hydrogen release reactions, revealing new anion species [H_(4-n)B(0H)_n]", n = 1, 2, 3 in the sodalite cages.