Details

Autor(en) / Beteiligte

• Zhang, Linghong
• Champagne, Pascale
• (Charles) Xu, Chunbao

Titel

Supercritical water gasification of an aqueous by-product from biomass hydrothermal liquefaction with novel Ru modified Ni catalysts

Ist Teil von

• Bioresource technology, 2011-09, Vol.102 (17), p.8279-8287

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2011

Quelle

MEDLINE

Beschreibungen/Notizen

• ► Ru modified Ni/γ-Al2O3 catalyst was effective in catalyzing biomass SCWG for H2 production. ► H2 yield increased with increasing reaction temperature, but decreased with increasing WHSV. ► Activated carbon as a catalyst support was more resistant than γ-Al2O3 to alkali attack in SCW. ► Biomass ashes not only catalyzed SCWG reactions but also resulted in reactor plugging. ► Hydrothermal liquefaction combined with SCWG was an effective approach for sludge treatment. 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.