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Supercritical water gasification of an aqueous by-product from biomass hydrothermal liquefaction with novel Ru modified Ni catalysts |
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| Authors: | Zhang Linghong Champagne Pascale Charles Xu Chunbao |
| Institution: | a Department of Civil Engineering, Queen’s University, Kingston, ON, Canada K7L 3N6 b Department of Chemical Engineering, Queen’s University, Kingston, ON, Canada K7L 3N6 c Department of Chemical Engineering, Lakehead University, Thunder Bay, ON, Canada P7B 5E1 d Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, ON, Canada N6A 5B9 |
| Abstract: | Supercritical water gasification (SCWG) of glucose solution (50-200 g/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 (10 wt.% 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 53.9 mol/kg dried feedstock at 750 °C, 24 MPa and a WHSV of 6 h−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. |
| Keywords: | Supercritical water gasification Ni-based catalyst Aqueous organic waste Glucose Hydrogen production |
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