Kinetic properties of Nickel–Titanium–Boride (Ni–Ti–B) catalysts for sodium borohydride hydrolysis reaction


Özdemir O. K.

4th International Hydrogen Technologies Congress, Edirne, Türkiye, 20 - 22 Haziran 2019, ss.58

  • Basıldığı Şehir: Edirne
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.58

Özet

 Hydrogen is considered to be a promising next-generation energy source due to its high heat value and possible generation from renewable sources. hydrogen can be stored traditionally in pressurized tanks, by adsorption on high surface area, nanostructured materials (activated carbon, carbon nanotubesmetal organic frameworks (MOFs), etc.) and hydrogen storing alloys, but all of these methods have some drawbacks such as low volumetric and gravimetric storage, high energy consumption, and safety considerations. Chemical hydrides (NaBH4, NaH, LiH, KBH4, NaAlH4, etc.) are promising candidates for pure hydrogen production and stored at room temperature. Because the adsorption and desorption kinetics of these chemical hydrides are fast enough to provide continuous H2 supply and transportation of hydrogen containing media is possible at close to atmospheric temperature and pressure conditions. Among them, sodium borohydride (NaBH4) is the most advantageous hydride due to its different properties such as high hydrogen capacity (10.8 wt.%), non-flammability, non-toxicity and stability in alkaline media. he alkaline sodium borohydride solution can only be hydrolyzed in the presence of suitable catalysts, and many studies have been done to find the suitable catalysis.

In the present work, new and efficient Nickel-Titanium Boride (Ni-Ti-B) catalysts will be developed for catalytic hydrolysis reaction of alkaline NaBH4 solution. Hydrogen generation rate will be measured using the ternary Ni-Ti-B catalyst as a function of different Ti concentration, solution temprature, NaBH4 concentration, and NaOH (a base-stabilizer) concentration. The performance of the system will be analyzed from themodynamic points of view and will be compared with the pristine Co-B catalysts.