Hydrogen production from isooctane by supercritical water gasification in the absence of catalyst
- Hydrogen production from isooctane by supercritical water gasification in the absence of catalyst
- 수산티; 김재훈; 김재덕; 이윤우
- supercritical water; gasification
- Issue Date
- Hydrogen production using supercritical water gasification offers some advantages for developing compact onboard reformer. In this research, isooctane, a model compound for gasoline, was chosen as feedstock. Experiments were performed non-catalytically in continuous tubular reactor made of Hastelloy C-276 at temperature of 600 – 700℃, pressure of 25 MPa. The residence time was varied from 6 to 33 s, isooctane concentration was varied from 5.7 to 32.7 wt% and hydrogen peroxide was varied from 0 to 4507.3 mmol/L. The effect of temperature, residence time, feed concentration and oxidant on carbon gasification efficiency (CGE) and gas yield are discussed in this paper. The results showed that high hydrogen gas yield was achieved at high temperature, long residence time, low isooctane concentration and with an appropriate amount of the oxidant. Carbon gasification efficiency (CGE) was increased as temperature, residence time and oxidant concentration increased and decreased as isooctane concentration increased. The produced gases consisted of hydrogen, methane and carbon dioxide as major composition, and carbon monoxide and C2-C4 species as minor composition. Total organic carbon in liquid product was quantified using Total Organic Carbon (TOC) analyzer.
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