Title:
Hydrogen and Methane Production by Supercritical Water Gasification of Ethanol as a Model Compound: Use and Reuse of Raney Nickel Catalyst
Author(s):
Demey, H., Lacaze, B., Sepini-Fressato, L., Hardy, J., Delattre, O., Thiery, S., Haarlemmer, G., Roubaud, A.
Document(s):
Paper
Abstract:
In this work, ethanol was studied as a model compound for understanding its degradation in supercritical water gasification (SCWG) with Raney nickel catalyst. Four gasification cycles were performed in order to evaluate the reutilization of the catalyst in the process and the influence of solid carbon deposit on the gas yield. The experiments were conducted at 450 °C, 250 bar and 30 min of holding time. The results were compared to those obtained without catalyst at the same operating conditions. The results showed that the total gas yield was highly improved (from 2.26 mol gas/kg of ethanol to 32 mol gas/kg of ethanol and 38 mol gas/kg of ethanol, in the first and second cycle). The H2 yield was higher than that of CH4 and CO2 without catalyst, but the total gas yield was relatively low. The Raney nickel catalysts contributes to improves the selectivity towards CH4 production in a major extend in the first and second cycles, and from the third cycle the total gas yield started to decrease and the H2 production was predominant. The major contribution of this work is that gas yield can be improved at mild temperatures (450°C) with a non-expensive catalyst, which can be re-use several times in the process before deactivation. The gas yield of the four cycles was estimated as 96.8 mol gas/kg of ethanol. This is promising for treating wastewaters from alcohol industries by SCWG at moderate temperatures.
Keywords:
ethanol, methane, wastewater treatment, hydrogen production, supercritical water gasification (SCWG)
Topic:
Biomass Conversion to Intermediate Bioenergy Carriers and Sustainable Biofuels
Subtopic:
Hydrothermal processing
Event:
31st European Biomass Conference and Exhibition
Session:
5DO.9.4
Pages:
887 - 890
ISBN:
978-88-89407-23-3
Paper DOI:
10.5071/31stEUBCE2023-5DO.9.4
Price:
FREE
