NaBH4 Hidrolizi İçin Al2O3 Destekli Çok Bileşenli Nanokatalizör Sentezi ve Kinetik Değerlendirmesi

Yapılan çalışmada Al2O3 destek üzerinde ikili Co-Fe ve üçlü Co-Fe-Pt katalizörleri emdirme tekniği ile sentezlenmiştir. Üretilen katalizörler ile alkali ortamda NaBH4’ün tepkime vermesi sağlanmış ve hidrojen üretim hızı ve kinetik verileri derlenmiştir. Katalizörlerin morfolojik ve boyutsal özelliklerinin anlaşılması maksadı ile taramalı ve geçirimli electron mikroskop (SEM ve TEM) analizleri, hidrojen üretim kapasiteleri ve kinetik verilerin belirlenmesi için ise hidroliz testleri gerçekleştirilmiştir. İki ve üç bileşenli katalizörlerden Co0,95Fe0,05/Al2O3 ve Co0,85Fe0,08Pt0,07/Al2O3 kendi gruplarında en iyi performansı sergilemişlerdir. 40 mg Co0,85Fe0,08Pt0,07/Al2O3 katalizörü ile 20 ˚C sıcaklıkta, 12.750 mL H2/gkat.min hidrojen üretim hızına erişilmiştir. NaBH4 ve katalizör miktarlarını farklılaştırılması ile yapılan çalışmalarda hidrojen üretim hızının katalizör miktarı ile orantılı olduğu ve NaBH4 miktarının tepkime hızına etki mertebesinin 0,22 olduğu görülmüştür. Yüksek aktivite sergileyen Co0,85Fe0,08Pt0,07/Al2O3 katalizörünün aktivasyon enerjisi 26,17 kJ/mol olarak hesaplanmıştır. Bu katalizörün tekrar kullanımlarındaki dönüşüm değerleri aktivitesine oranla daha tatmin edici düzeydedir.

Anahtar Kelimeler:

Hidroliz, NaBH4, Co-Fe-Pt katalizör, kinetik

Synthesis and Kinetic Evaluation of Al2O3 Supported Multi-Component Nanocatalyst for NaBH4 Hydrolysis

In this study, dual Co-Fe and triple Co-Fe-Pt catalysts on Al2O3 support were synthesized by impregnation technique. With the produced catalysts, NaBH4 was allowed to react in an alkaline environment and hydrogen production rate and kinetic data were compiled. Scanning and transmission electron microscopy (SEM and TEM) analyzes were carried out in order to understand the morphological and dimensional properties of the catalysts, and hydrolysis tests were performed to determine hydrogen production capacities and kinetic data. Two and three component catalysts Co0.95Fe0.05/Al2O3 and Co0.85Fe0.08Pt0.07/Al2O3 showed the best performance in their groups. With 40 mg Co0.85Fe0.08Pt0.07/Al2O3 catalyst, hydrogen production rate of 12,750 mL H2/gkat.min was reached at 20 ˚C. By differentiating the amount of NaBH4 and catalyst, it was observed that the hydrogen generation is proportional to the amount of catalyst, and the order of reaction with rescept to NaBH4 is 0,22. The activation energy of the high activity Co0.85Fe0.08Pt0.07/Al2O3 catalyst was calculated as 26.17 kJ/mol. The conversion values in the reuse of this catalyst are more satisfactory than its activity.

Keywords:

Hydrolysis, NaBH4, Co-Fe-Pt catalyst, kinetics,

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