Interaction Of CO2/CH4 With Steel Wool In An
Electrocatalytic Dry Reforming Reactor
Author(s)
M. Banville, R. A. Lee, R. Labrecque & J. M. Lavoie
Abstract
Dry reforming is a process allowing simultaneous conversion of hydrocarbons
(methane being the prototype molecule used for this study) to syngas using
carbon dioxide as an oxidizing agent. Such strategy may eventually become an
opportunity for the industrial sector to produce syngas whilst valorizing residual
CO2. As reported previously, an iron-based catalyst, i.e. steel wool, activated by
an electrical current showed potential for dry reforming. As a follow up to this
preliminary work, this study mainly focuses on the characterization of the lowcost
thin iron wires in order to determine the robustness and stability of the iron
material over extended operation. Under CO2/CH4 molar feed ratios ranging
from 0.8 to 1.25, coking is inhibited by high surface temperature. After 25 hours
of operation at a temperature higher than 900°C measured in the gas phase, XRD
patterns show a preserved Fe structure along with FeO suggesting an eased redox
cycle with CO2 and CH4. It is also showing that a high CO2/CH4 ratio favors
higher oxidation states of the iron in the zone of the iron bed, which is first in
contact with the gas input. Decreasing the temperature to 800°C favors oxidation
by CO2 over reduction by CH4 leading to Fe3O4 formation. This disturbs the
Joule dissipation through the wire mesh catalyst bed. Although high molar ratios
of CO2 over CH4 result in fast oxidation of the catalyst, reducing the ratio may
lead to increasing the catalyst lifespan which, overall, is essential to scale this
process to a commercial scale.
Keywords: carbon dioxide, dry reforming, iron, syngas, methane.
Keywords
Keywords: carbon dioxide, dry reforming, iron, syngas, methane.
Related Book
Other papers in this volume
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