Journal
FUEL
Volume 96, Issue 1, Pages 541-545Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2012.01.066
Keywords
Supercritical water gasification (SCWG); Hydrogen generation; Nickel catalysts; Ruthenium modifier; Stability
Categories
Funding
- Ontario Ministry of Energy
- Ontario Centers of Excellence (OCE) through the Atikokan Bioenergy Research Center (ABRC)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Ontario Ministry of Research Innovation
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The activities and stabilities of gamma-Al2O3 supported Ni catalysts (Ni10/gamma-Al2O3 and Ru(0.1)Ni10/gamma-Al2O3) for hydrogen generation through the supercritical water gasification (SCWG) of glucose were investigated at 700 degrees C, 24 MPa and a weight hourly space velocity (WHSV) of 6 h (1) in a bench-scale continuous down-flow tubular reactor. The Ru0.1Ni10/gamma-Al2O3 catalyst (10 wt.% Ni, the Ru-to-Ni molar ratio of 0.1) exhibited higher activity and stability than Ni10/gamma-Al2O3 (10 wt.% Ni). With the Ru(0.1)Ni10/gamma-Al2O3 catalyst, negligible catalyst deactivation was observed over a period of 33 h on stream. The H-2 yield was maintained as high as similar to 50 mol/kg glucose throughout the entire stability test. In contrast, the activity of Ni10/gamma-Al2O3 catalyst (10 wt.% Ni) decreased after approximately 7 h on stream, accompanied by a marked decrease in the H-2 yield from similar to 50 mol/kg glucose initially to similar to 25 mol/kg glucose after 7 h. The temperature-programmed reduction (TPR) and H-2 chemisorption analyses on the fresh catalysts demonstrated that the addition of a small amount of Ru as a modifier could improve Ni dispersion, which could account for the enhanced activity and higher stability of the Ru(0.1)Ni10/gamma-Al2O3 catalyst. (C) 2012 Elsevier Ltd. All rights reserved.
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