Abstract
One of the alternative energy sources to fossil fuels is the use of hydrogen as an energy carrier, which provides zero emission of pollutants and high-energy efficiency when used in fuel cells, hydrogen internal combustion engines (HICE) or hydrogen-blend gaseous fueled internal combustion engines (HBICE). The gasification of organics in supercritical water is a promising method for the direct production of hydrogen at high pressures, with very short reaction times. In this study, hydrogen production from 2-propanol over Pt/Al2O3 and Ru/Al2O3 catalysts was investigated in supercritical water. To investigate the influences on hydrogen production, the experiments were carried out in the temperature range of 400–550°C and in the reaction time range of 10–30s, under a pressure of 25MPa. In addition, different 2-propanol concentrations and reaction pressures were tested in order to comprehend the effects on the gasification yield and hydrogen production. It was found that Pt/Al2O3 catalyst was much more selective and effective for hydrogen production when compared to Ru/Al2O3. During the catalytic gasification of a 0.5M solution of 2-propanol, a hydrogen content up to 96mol% for a gasification yield of 5L/L feed was obtained.
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