Recovery of Hydrogen from Sodium Borhydride Hydrolysis with Co-Ni-B Catalyst and Kinetic Properties

Öz

In the literature, the use of catalytically active and low- cost catalysts is preferred for the hydrolysis of boron hydrides and on demand hydrogen production in the presence of a catalyst. In this study, the effects of Co-Ni-B catalyst synthesized in ethanol medium on sodium borohydride hydrolysis kinetics, optimum Co/N mole rations, NaOH, NaBH4 concentrations in the solution, amount of catalyst and different temperatures were investigated. The initial hydrogen production rate, which showing the activity of the produced Co-Ni-B catalyst against sodium borohydride hydrolysis, was found to be 6491.6 mL/g.dk. at 30°C hydrolysis sodium values of borohydride obtained at different temperatures in the presence of Co-Ni-B catalyst n. When the degree rate mechanism was used, the reaction rate order was 0.9 and activation energy value calculated as 22.850 kJ/mol The characterization of the Co-Ni-B catalyst, which is produced in the presence of ethyl alcohol and is very active in sodium borohydride hydrolysis was performed with SEM, EDS device.

Anahtar Kelimeler

• Co-Ni-B
• Hydrogen energy
• Hydrolysis
• Catalyst
• ethanol

Co-Ni-B Katalizörü ile Sodyum Borhidrür Hidrolizinden Hidrojenin Elde Edilmesi ve Kinetik Özellikler

Öz

Literatürde bor hidrürlerin hidrolizi ile katalizör varlığında isteğe bağlı hidrojen üretimi için katalitik olarak aktif ve düşük maliyetli katalizörlerin kullanımı tercih edilmektedir. Bu çalışmada, etanol ortamında sentezlenen Co-Ni-B katalizörü, sodyum bor hidrür hidroliz kinetiğine etkileri, optimum Ni/Co mol oranları, çözeltideki NaOH ve NaBH4 konsantrasyonları, katalizör miktarı ve farklı sıcaklıklara bağlı olarak incelenmiştir. Üretilen Co-Ni-B katalizörünün sodyum bor hidrür hidrolizine karşı aktivitesini gösteren başlangıç hidrojen üretim hızı 30 oC sıcaklıkta, 6491.6 mL/gdk. olarak bulunmuştur. Co-Ni-B katalizörü varlığında farklı sıcaklıklarda elde edilen sodyum bor hidrür hidroliz değerleri n. derece hız mekanizması kullanıldığında reaksiyon hız mertebesinin 0.9 ve aktivasyon enerji değeri 22.850 kJ/mol olarak hesaplanmıştır. Etil alkol varlığında üretilen ve sodyum bor hidrür hidrolizinde oldukça aktif olan Co-Ni-B katalizörünün karakterizasyonu SEM, EDS cihazları ile yapılmıştır.

Anahtar Kelimeler

• Co-Ni-B
• Hidrojen enerjisi
• Hidroliz
• Katalizör
• etanol

Kaynakça

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