Al2O3/Spirulina Platensis Destekli Co Katalizörü Varlığında Sodyum Borohidrürün Metanolizinden Hidrojen Üretiminin Araştırılması

Abstract

In this study, Al2O3/Spirulina Platensis mixture was used for the first as support material. The aim is to demonstrate that microalgae can be used as a new, economic and environmental support agent to increase the efficiency of the catalysts that will be eventually used in the production of hydrogen. The strain was grown by preparing the culture medium containing all the necessary nutrients as described in the literature. To synthesize the catalyst for the production of hydrogen through methanolysis of sodium borohydride (NaBH4), phosphoric acid (3M H3PO4) was used as the protonation agent for the selected strain. After achieving sufficient density, the strain was dried and mixed with Al2O3 in the ratio of 1/1. Modified Al2O3/S. Platensis mixture was finally blended with cobalt ions and the mixture was burned. As a result of this procedure Al2O3/S. Platensis supported Co catalyst was produced. The catalyst was prepared with the addition of different Co2+ metal concentrations, 10%, 20%, 30%, and 40% respectively. In the present study, the experiments were generally carried out with 10 ml methanol solution containing in 0.025 g NaBH4 with 0.1 g catalyst at 30 °C. The hydrogen obtained in experimental studies was determined volumetric in the gas measurement system. Here, different NaBH4 concentrations, catalyst amount and different temperature effects were investigated. The effect of the amount of NaBH4 was investigated with 1%, 2.5%, 5%, and 7.5% ratio of NaBH4 while the influence of the concentration of catalyst was carried out 0.05, 0.1, 0.15, and 0.25 g catalysts. To investigate the performance of the catalyst on hydrogen production with NaBH4 methanolysis under different temperatures, 30, 40, 50 ve 60 °C, relatively. The experiments by using Al2O3/S. Platensis supported Co Catalyst reveal that the best metal ratio was 10% Co2+. In addition, the maximum hydrogen production rate through methanolysis reaction of NaBH4 by this catalyst was found to be 5747.1 mLmin-1gcat-1. Also, the activation energy was determined to be 34.67 kJ mol-1. Moreover, different NaBH4 concentrations, catalyst amounts and temperature studies of the fabricated catalyst were carried and it was discovered that there was no decline in the % of conversion for the synthesized catalyst.