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Son günlerde yaşanan COVID-19 salgını, temiz ve yenilenebilir enerji kaynaklarının kullanımının ne derece önemli olduğunu birkez daha göstermiştir. Bu çalışmada, geleceğin enerji kaynağı olarak düşünülen temiz hidrojen, Ni-B katalizörleri kullanılarak NaBH4’ün hidrolizi ile üretilmiştir. Hidroliz reaksiyonu esnasında reaksiyon kinetiğine doğrudan etkisinin olduğu bilinen ortam sıcaklığı, karıştırma hızı, katı-sıvı oranı ve kullanılan yakıtta NaBH4 _NaOH oranı gibi parametrelerin reaksiyon hızına olan etkileri yanıt yüzey metodu ile ayrıntılı olarak incelenmiştir. Kullanılan yanıt yüzey metodunda deneysel çalışmalar Taguchi L9 ortogonal dizisi kullanılarak gerçekleştirilmiş ve parametrelerin etkinliği varyans analizi ile belirlenmiştir. Oluşturulan model sonucunda, maksimum hidrojen üretim hızının eldesi için optimum parametreler; ortam sıcaklığı 347,17ºK; karıştırma hızı 200,21 rpm; katı-sıvı oranı 2,86 mgkatalizör/mlyakıt; ve NaBH4--NaOH oranı 1,04 olarak belirlenmiştir. Varyans analizine göre hidrojen üretim hızını etkileyen parametrelerin etkinliği sırasıyla reaksiyon sıcaklığı, karıştırma hızı ve NaBH4_NaOH oranı olarak belirlenmiştir. Buna karşılık katı-sıvı oranının etkisinin belirgin bir şekilde ortaya çıkmadığı görülmüştür. Yanıt yüzey yöntemi kullanılarak geliştirilen modelden elde edilen tahmin sonuçları ile deneysel verilerin birbirilerini doğruladığı, yapılan doğrulama deneyleri sonucunda ortaya konulmuştur.
The recent COVID-19 epidemic has once more shown how important the use of clean and renewable energy sources is. In this study, clean hydrogen, considered the source of energy of the future, is produced with hydrolysis of NaBH4 using Ni-B catalysts. The effects on the reaction rate of parameters such as the temperature of the environment known to have a direct effect on the reaction kinetics during the hydrolysis reaction, the mixture rate, the solid-fluid ratio and the NaBH4 _NaOH ratio in the fuel used were studied in detail by the response surface method. Experimental studies in the used response surface method were carried out using the Taguchi L9 ortogonal series and the effectiveness of the parameters was determined by variance analysis. As a result of the model created, the optimal parameters for the maximum hydrogen production rate are determined; the medium temperature is 347,17oK; the mixing speed is 200,21 rpm; the solid-fluid ratio is 2,86 mg of catalyst/fuel; and the NaBH4--NaOH ratio is 1,04. According to the variance analysis, the effectiveness of the parameters affecting the speed of hydrogen production is determined accordingly as the reaction temperature, mixing speed and the NaBH4_NaOH ratio. In contrast, the effect of the solid-fluid ratio has not been clearly shown. The results of the estimates obtained from the model developed using the response surface method and the results of verification experiments in which the experimental data verify each other.
The COVID-19 pandemic shows once again how important the use of clean and renewable energy sources is. In this study, clean hydrogen, which is considered as the energy source of the future, was produced by the hydrolysis of NaBH4 using Ni-B catalysts. During the hydrolysis reaction, the effects of parameters such as reaction temperature, stirring speed, solid-liquid ratio and NaBH4_NaOH ratio in the fuel used, which are known to have a direct effect on the reaction kinetics, on the reaction rate were studied in detail by the response surface methodology. Experimental studies in the response surface methodology used were carried out using the Taguchi L9 orthogonal array and the efficiency of the parameters was determined by analysis of variance. As a result of the created model, optimum parameters for obtaining the maximum hydrogen production rate; reaction temperature 347.17ºK; stirring speed 200.21 rpm; solid-liquid ratio 2.86 mgcatalyst/mlfuel; and the ratio of NaBH 4-NaOH 1.04. According to the analysis of variance, the efficiency of the parameters affecting the hydrogen generation rate was determined as reaction temperature, stirring speed and NaBH4_NaOH ratio, respectively. On the other hand, it has been seen that the effect of solid-liquid ratio does not appear clearly. As a result of the validation tests, it was revealed that the predictions obtained from the model developed using the response surface methodology are in good agreement with the experimental results.
Field : Fen Bilimleri ve Matematik; Mühendislik; Sağlık Bilimleri
Journal Type : Ulusal
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