Preparation Of High Surface Area Co-Based Alloyed Catalysts And Their Performance Or Hydrolysis Of Borohydrides

As one of the most promising way to store hydrogen, both Na BH4 and NH3BH3 representing for solid state hydrogen storage materials have obvious advantages in safety operation, Energy efficiency and hydrogen storage capacitance comparing to high pressure storage and Liquefied hydrogen storage.The method of chemical reduction was used to synthesis four cobalt-based catalysts, Co-B-Ti O2, Co-Ni-W-B, Co-Ni-B@Cu-MOF and Co-B/Ni-B based on Co-B alloy catalyst. These materials were characterized by a variety of ways including physical sorption instrument, XRD and SEM. Meanwhile the catalytic properties were detected in hydrogen desorption test platform assembled ourselves. Based on these catalyst, a relatively rounded system that different types of Co-based alloy catalysts catalyze the hydrolysis of sodium borohydride and ammonia borane to produce hydrogen was constructed. The main contents and achievements are as follows:(1) The performance of Ti O2 as the carrier of Co-B-Ti O2 nano composite catalyst for hydrogen production by hydrolysis of sodium borohydride was studied. And it has showed excellent performance comparing to simply Co-B catalyst. Further catalytic mechanism would be studied after comprehensive test of cycling stability and different conditions of temperature, amount of catalyst and the concentration of Na BH4.(2) The specific surface of unit volume of Co-Ni-W-B Nano alloy catalyst synthesized in alcohol was found increased to four times larger than in water utilizing the solvent effect. And the hydrolysis of ammonia borane performance was also greatly improved.(3) The catalytic performance of Co-Ni-B@Cu-MOF composite catalyst that hydrolyzed the ammonia borane to produced hydrogen was improved obviously comparing to the simply Cu-MOF. The SEM pictures showed that there would be some pores on the composite catalyst and it was exactly these pores that promote the catalytic performance for the increased contact area with the solution.(4) The Co-B/Ni-B Nano-composite catalyst that catalyzed the hydrolysis of ammonia borane synthesized through two times reduction agglomerated less with regular nano structure and better catalytic performance comparing to catalyst Co-B, Ni-B and Co-Ni-B.