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Catalytic reforming of glycerol in supercritical water with nickel-based catalysts
Author(s)
Pairojpiriyakul, Thirasak
Croiset, Eric
Kiatkittipong, Worapon
Arpornwichanop, Amornchai
Assabumrungrat, Suttichai
Date Issued
September 12, 2014
Type
Article
Abstract
The catalytic performance of nickel catalysts supported on La 2O3, α-Al2O3, γ-Al 2O3, ZrO2, and YSZ for supercritical water reforming of glycerol was investigated. Experiments were conducted in a tubular reactor made of Inconel-625 with the temperature range of 723-848 K under a pressure of 25 MPa. Carbon formation causing operation failure was observed for α-Al2O3, γ-Al2O3 and ZrO2 at temperatures higher than 748, 798 and 823 K, respectively. Ni/La2O3 exhibited the highest H2 yield where almost complete conversion was obtained at 798 K. Moderate space velocities (WHSV = 6.45 h-1) and glycerol feed concentration (5wt.%) favor high hydrogen selectivity and yield. Methanation is favored at a low WHSV or high glycerol feed concentration, resulting in a lower H2 yield. Increasing Ni loading on the Ni/La2O3 catalyst strongly promoted the reforming, water-gas shift, and methanation reactions, which contributed significantly to the product species distribution. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Citation
International Journal of Hydrogen Energy, 39(27), 14739-14750, 2014