Abstract
Supercritical water gasification (SCWG) of glucose solution (50–200g/L), a simulated aqueous organic waste (composed of glucose, acetic acid and guaiacol) and a real aqueous organic waste stream generated from a sludge hydrothermal liquefaction process was performed in a bench-scale continuous down-flow tubular reactor with novel 0.1RuNi/γ-Al2O3 or 0.1RuNi/activated carbon (AC) catalyst (10wt.% Ni with a Ru-to-Ni molar ratio of 0.1). 0.1RuNi/γ-Al2O3 was very effective in catalyzing SCWG of glucose solution and the simulated aqueous organic waste, attaining an H2 yield of 53.9mol/kg dried feedstock at 750°C, 24MPa and a WHSV of 6h−1. However, the γ-Al2O3-supported catalyst was not resistant to the attack of alkali and nitrogen compounds in the real waste during the SCWG of the real aqueous organic waste, whereas the AC-based catalyst exhibited higher stability. This research provides a promising approach to the treatment and valorization of aqueous organic waste via SCWG.
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