Co-B-F ve Co-B-P KATALİZÖRLERİ KULLANILARAK NaBH4'DEN HİDROJEN ÜRETİMİNE NaOH'İN ETKİSİ

Bu çalışmada sodyum borhidrürün hidrolizi ile hidrojen üretimi için Co-B-P ve Co-B-F katalizörleri sentezlenmiştir. Sodyum borhidrürden hidrojen üretiminde stabiliteyi sağlamak amacıyla kullanılan sodyum hidroksit konsantrasyonu oldukça önem arz etmekte zira fazla kullanılması durumunda katalizörün katalitik aktivitesini azaltırken, az kullanılması ya da hiç kullanılmaması durumunda ise sodyum borhidrürün kendiliğinden bozunması gerçekleşmektedir. Bu nedenle sentezlenen Co-B-F ve Co-B-P katalizörlerinin sodyum borhidrürün hidrolizinde kullanılması durumundaki optimum sodyum hidroksit konsantrasyonları belirlenmiştir. Farklı sodyum hidroksit konsantrasyonları varlığında reaksiyon hızlarına etkileri ve reaksiyon hız sabitlerine etkileri ayrı ayrı belirlenerek sodyum hidroksit konsantrasyonunun sodyum borhidrürün hidrolizi ile hidrojen üretimi üzerinde ne kadar etkin ve önemli olduğu belirlenmiştir. Co-B-F katalizörü için hidrojen üretim hızı %2,5 NaOH konsantrasyonu varlığında 2400 ml/dk.katalizör, Co-B-P katalizörü için ise 1605 mL/dk.katalizör olarak belirlenmiştir.

Effect Of NaoH In Hydrogen Production From NaBH4 By Using Co-B-F And Co-B-P Catalysts

In this study, Co-B-F and Co-B-P catalysts were synthesized in order to produce hydrogen from sodium boron hydride hydrolysis. Sodium hydroxide concentration in hydrogen production from sodium boron hydride is immensely important to stabilize the reaction. In the case of over use of sodium hydroxide, catalytic activity of the catalyst will decrease, On the other hand, In the case of under-use or without any usage of the catalyst, sodium boron hydride degradation will occur. For these reasons, optimum sodium hydroxide concentrations were determined in the case of synthesized Co-B-F and CoB-P catalysts usage in sodium boron hydride hydrolysis. In the presence of different sodium hydroxide concentrations, reaction rates and reaction rate constants were examined separately which hydrolysis of sodium borohydride with sodium hydroxide concentration was determined to be effective and how important the hydrogen production. Co-BF in the presence of catalyst for hydrogen production rate of 2.5% concentrations of NaOH in 2400 ml / dk.catalyst, Co-BP for the catalysts was 1605 ml / dk.catalyst was determined.

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  • Amendola S.C., Onnerud P., Kelly M.T., Petillo P.J., Sharp-Goldman S.L., Binder M. J. 2000. An ultrasafe hydrogen generator: aqueous, alkaline borohydride solutions and Ru catalyst. Power Source 85 -186.
  • Fernandes R, Patel N, Miotello A. 2009. Hydrogen generation by hydrolysis of alkaline NaBH4 solution with Cr-promoted Co-B amorphous catalyst. Appl Catal B Environ. 92:68-74.
  • Ingersoll, J. C., Mani, N., Thenmozhiyal, J. C. and Muthaiah A., 2007, Catalytic hydrolysis of sodium borohydride by a novel nickel-cobalt-boride catalyst, Journal of Power Sources. 173, 450-457.
  • İzgi M.S., Şahin Ö. Saka C. 2015. Hydrogen production from NaBH4 using Co-Cu-B catalysts prepared in doi:10.1016/j.ijhydene.2015.11.004 of plasma treatment. Int. J. of Hydrogen Energy.
  • Patel N, Fernandes R, Miotello A. 2010. Promoting effect of transition metal-doped Co-B alloy catalysts for hydrogen production by hydrolysis of alkaline NaBH4 solution. J Catal 271:315-24.
  • Sahin O, Kaya M, Izgi M. S, Saka C. 2015. The effect of microwave irradiation on a Co-b-based catalyst for hydrogen generation by hydrolysis of NaBH4 solution. Energy Sources Part A 37:462-7.
  • Schlesinger H.I., Herbert C.B., Finholt A.E., Gilbreath J.R., Hoekstra H.R., Hyde E.K., 1953. Sodium borohydride, its hydrolysis and its use as a reducing agent and in the generation of hydrogen, Journal of the American Chemical Society, 75 (19, pp 215- 219)
  • Suda X. S, Y.- Sun M. Liu B.-H, Zhou, Y, Morimitsu,m S. Arai, K. Tsukamoto, N. Uchida, M. Candra, Li Y. Z.-P. 2001 Catalytic generation of hydrogen by applying fluorinated-metal hydrides as catalysts Appl. Phys. A 72, 209-212.