Abstract
In total 17 heterogeneous catalysts, with combinations of 4 transition metals (Ni, Ru, Cu and Co) and various promoters (e.g.; Na, K, Mg, or Ru) supported on different materials (γ-Al2O3, ZrO 2, and activated carbon (AC)), were investigated with respect to their catalytic activity and stability for H2 production from glucose via supercritical water gasification (SCWG). The experiments were carried out at 600 °C and 24 MPa in a bench-scale continuous-flow tubular reactor. Ni (in metallic form) and Ru (in both metallic and oxidized forms) supported on γ-Al2O3 exhibited very high activity and H 2 selectivity among all of the catalysts investigated for a time-on-stream of 5-10 h. With Ni20/γ-Al2O3 (i.e.; γ-Al2O3 with 20 wt% Ni), a H2 yield of 38.4 mol/kg glucose was achieved, approximately 20 times higher than that obtained during the blank test without catalyst (1.8 mol/kg glucose). In contrast, Cu and Co catalysts were much less effective for glucose SCWG reactions. As for the effects of catalyst support materials on activity, the following order of sequence was observed: γ-Al2O3 > ZrO2 > AC. In addition, Mg and Ru were found to be effective promoters for the Ni/γ-Al2O3 catalyst, suppressing coke and tar formation. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Original language | English |
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Pages (from-to) | 9591-9601 |
Journal | International Journal of Hydrogen Energy |
Volume | 36 |
Issue number | 16 |
DOIs | |
Publication status | Published - Aug 2011 |
Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Research Keywords
- Coke formation
- Glucose
- H2 production
- Heterogeneous catalysts
- Supercritical water gasification
- Transition metals