Ru immobilized Al 2O 3 pellets were synthesized as a catalyst for hydrogen generation in NaBH 4 solutions. Under the Ru/Al 2O 3 catalysis, the hydrogen generation rate from the hydrolysis and methanolysis of NaBH 4 in alkaline solution was explored as a function of NaBH 4 concentration and temperature. Meanwhile, the borate byproducts derived from the NaBH 4 hydrolysis were characterized by XRD and NMR. The results showed that the hydrogen generation rate depended on NaBH 4 concentration for the hydrolysis, but did not for the methanolysis. 10 wt% NaBH 4 hydrolysis containing 1 wt% NaOH catalyzed with 0.5 g Ru/Al 2O 3 could generate hydrogen with a rate of about 65.5 ml min -1 g -1. The productivity and activation energy of hydrogen generation from the NaBH 4 hydrolysis were 93% and 41.8 kJ mol -1, and from the NaBH 4 methanolysis were 97% and 51.0 kJ mol -1, respectively. The XRD and NMR analyses showed that the species from the hydrolysis byproducts varied with the NaBH 4 concentration could be the borax (Na 2B 4O 7·H 2O) and sodium borate hydrate (NaBO 2·H 2O).
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)