BİYOKÜTLE TÜREVİ PROSOPİS FARCTA KATALİZÖRÜ KULLANILARAK ETİL ALKOL/PROPİLEN GLİKOL ÇÖZÜCÜ SİSTEMİNDE NABH₄’DEN HİDROJEN ÜRETİMİ

Abstract

Artan enerji ihtiyacı, fosil yakıtların sınırlı olması ve çevresel kaygılar, alternatif enerji kaynaklarına yönelimi hızlandırmıştır. Bu bağlamda hidrojen, yüksek enerji yoğunluğu ve çevre dostu özellikleri ile öne çıkan bir enerji taşıyıcısıdır. Bu çalışmada, hidrojen üretimi için sodyum borhidrür (NaBH₄) kullanılmış ve reaksiyonun verimini artırmak amacıyla biyokütle temelli bir katalizör geliştirilmiştir. Katalizör sentezinde, Siirt kırsalında yetişen Prosopis farcta bitkisinin meyvesi biyokütle kaynağı olarak kullanılmıştır. Biyokütle, %30 KOH ile kimyasal olarak aktive edilmiş, 75 °C’de 24 saat bekletildikten sonra 400 °C’de 45 dakika karbonize edilmiştir. Elde edilen katalizör yıkanarak kullanıma hazır hale getirilmiştir. Hidrojeni üretmek için çözücü ortamı olarak etil alkol ve propilen glikol çözücü karışımları kullanılmıştır. Hidrojen üretim verimini etkileyen NaBH4 miktarı, katalizör miktarı ve sıcaklık parametreleri incelenmiştir. Yapılan deneyeler ve hesaplamalarda aktivasyon enerjisi 20.209 kj/mol ve ilk hızı 8126,3 mL H₂/gcat/dk olarak hesaplanmıştır.

Keywords

• Prosopis Farcta
• Sodyum borhidrür
• Katalizör
• Hidrojen enerjisi.

HYDROGEN PRODUCTİON FROM NABH₄ İN AN ETHANOL/PROPYLENE GLYCOL SOLVENT SYSTEM USİNG A BİOMASS-DERİVED PROSOPİUM CATALYST

Abstract

The growing demand for energy, the limited supply of fossil fuels, and environmental concerns have accelerated the shift toward alternative energy sources. In this context, hydrogen stands out as an energy carrier due to its high energy density and environmentally friendly properties. In this study, sodium borohydride (NaBH₄) was used for hydrogen production, and a biomass-based catalyst was developed to enhance the reaction’s efficiency. In the catalyst synthesis, the fruit of the Prosopis farcta plant, which grows in the rural areas of Siirt, was used as the biomass source. The biomass was chemically activated with 30% KOH, left to stand at 75 °C for 24 hours, and then carbonized at 400 °C for 45 minutes. The resulting catalyst was washed and prepared for use. A mixture of ethyl alcohol and propylene glycol solvents was used as the solvent medium for hydrogen production. The effects of NaBH₄ concentration, catalyst amount, and temperature on hydrogen production efficiency were investigated. In the experiments and calculations, the activation energy was determined to be 20,209 kJ/mol and the initial rate was calculated to be 8,126.3 mL H₂/gcat/min.

Keywords

• Prosopis Farcta
• Sodium Borohydride
• Catalyst
• Hydrogen Energy.

References

1. Akdemir, M., Avci Hansu, T., Caglar, A., Kaya, M., & Demir Kivrak, H. (2021). Ruthenium modified defatted spent coffee catalysts for supercapacitor and methanolysis application. Energy Storage, 3(4), e243.
2. Alshammari, M., Alshammari, K., Alhassan, S., Alshammari, A. H., Alotaibi, T., Alotibi, S., ... & Taha, T. A. M. (2024). A high-performance Cr2O3/CaCO3 nanocomposite catalyst for rapid hydrogen generation from NaBH4. Nanomaterials, 14(4), 333.
3. Arzac, G. M., & Fernández, A. (2015). Hydrogen production through sodium borohydride ethanolysis. International Journal of Hydrogen Energy, 40(15), 5326-5332.
4. Aziz, M., Darmawan, A., & Juangsa, F. B. (2021). Hydrogen production from biomasses and wastes: A technological review. International Journal of Hydrogen Energy, 46(68), 33756-33781.
5. Burhenne, L., Messmer, J., Aicher, T., & Laborie, M. P. (2013). The effect of the biomass components lignin, cellulose and hemicellulose on TGA and fixed bed pyrolysis. Journal of Analytical and Applied Pyrolysis, 101, 177-184.
6. Fernandes, R., Patel, N., & Miotello, A. (2009). Hydrogen generation by hydrolysis of alkaline NaBH4 solution with Cr-promoted Co–B amorphous catalyst. Applied Catalysis B: Environmental, 92(1-2), 68-74.
7. Hansu, T. A. (2021). Study of the activity of a novel green catalyst used in the production of hydrogen from methanolysis of sodium borohydride. MANAS Journal of Engineering, 9(2), 115-121.
8. Hansu, T. A. (2023). Exergy and energy analysis of hydrogen production by the degradation of sodium borohydride in the presence of novel Ru based catalyst. International Journal of Hydrogen Energy, 48(18), 6778-6787.

9. Lai, J. L., Luo, W. J., Kuan, Y. D., & Zhang, P. J. (2021). The effect of hydrogen production rate of the via different preparation of Co-based catalyst with sodium borohydride. Catalysts, 11(5), 528.
10. Li, D. C., & Jiang, H. (2017). The thermochemical conversion of non-lignocellulosic biomass to form biochar: a review on characterizations and mechanism elucidation. Bioresource technology, 246, 57-68.
11. Miri, A., Khatami, M., Ebrahimy, O., & Sarani, M. (2020). Cytotoxic and antifungal studies of biosynthesized zinc oxide nanoparticles using extract of Prosopis farcta fruit. Green Chemistry Letters and Reviews, 13(1), 27-33.
12. Rüzgar, D., Yıldız, D., Kaya, Ş., verdu Martinez, J., Yeşilbursa, G., & Kıvrak, H. D. (2024). Waste ceramic frit as novel catalyst triggering sodium borohydride methanolysis reaction. International Journal of Hydrogen Energy, 56, 1038-1048.
13. Saka, C. (2023). Highly active hydrogen generation from sodium borohydride methanolysis and ethylene glycolysis reactions using protonated chitosan-zeolite hybrid metal-free particles. Applied Catalysis B: Environmental, 325, 122335.
14. Saka, C. (2024a). Fabrication of protonated chitosan/montmorillonite catalyst for hydrogen production via sodium borohydride in the optimum methanol/propylene glycol mixture. International Journal of Hydrogen Energy, 65, 410-420.
15. Saka, C. (2024b). Rapid and robust hydrogen generation from sodium borohydride in optimum mixture of methanol and ethylene glycol using phosphorus-doped chitosan polymer matrix dispersed on alumina nanoparticles. Journal of Molecular Liquids, 401, 124654.
16. Sharma, S., Basu, S., Shetti, N. P., & Aminabhavi, T. M. (2020). Waste-to-energy nexus for circular economy and environmental protection: Recent trends in hydrogen energy. Science of the Total Environment, 713, 136633.