Modeling Carbon Monoxide Direct Oxidation in Solid Oxide Fuel Cells

Abstract

In the present study, the results of the numerical implementation of a mathematical model of a planar anode-supported SOFC are reported. In particular, model results are validated and discussed when the fuel is a mixture of hydrogen and carbon monoxide, focusing on the importance of simulating direct oxidation of carbon monoxide. The mathematical model is solved in a 3D environment and the key issue is the validation comparing with experimental data, which is made in different operating conditions to establish the reliability of the presented model. The results show the importance of simulating direct oxidation of carbon monoxide and its effect on the fuel cell performance.

Characterization of a 100 W SOFC stack fed by carbon monoxide rich fuels

“…as defined in other studies [12]. This range of CO was chosen because the maximum amount of carbon monoxide inside a mixture of reformed gas from biogas, landfill gas or natural gas and from gas processes such as pyrolysis and gasification, is generally lower than 40% by volume [8,9,20].…”

“…On the other hand, if the current is mainly produced by H 2 oxidation, the shift reaction compensates the reduced H 2 concentration [12].…”

Multi-physicochemical modeling of direct methane fueled solid oxide fuel cells

“…It has been realized that the rate of CO oxidation is about 2w3 times less than that of hydrogen oxidation under the same oxidant partial pressure [23]. When the rate of CO oxidation reaction is assumed to be three times lower than that of H 2 oxidation, the modeling result is able to obtain a good agreement with experimental data [24]. Therefore, this assumption is employed to describe COeCO 2 oxidation reaction,…”

“…R H2O ¼ Àr 4 R An ¼ Q ohm þ Q chem r CHðsÞ ¼ r 16 À r 17 þ r 20 À r 21 R CO2 ¼ Àr 5 R Cl ¼ 0 r CðsÞ ¼ Àr 10 þ r 17 þ r 21 À r 24 R CO ¼ Àr 6 r COðsÞ ¼ r 6 þ r 10 À r 11 þ r 12 þ r 24 À r 25 R O2 ¼ Àr 27 r CO2ðsÞ ¼ r 5 þ r 11 þ r 25 r HðsÞ ¼ 2r 1 À r 7 À r 8 þ r 12 þ r 14 þ r 15 þ r 16 þ r 17 À r 22 À r 23 r OHðsÞ ¼ r 7 À r 8 À r 9 þ r 13 þ r 18 þ r 19 þ r 20 þ r 21 þ r 22 À r 23 r OðLSMÞ ¼ 2r 27 À r 18 of the large ceramic tube. The molar fractions show relatively large gradients near the porous anode.…”

SOFC fuelled with reformed urea

“…Among the different fuels that have been studied in high temperature fuel cells, it is worth mentioning ammonia [1][2][3][4][5], biogas [6][7][8][9][10][11][12][13][14], syngas from biomass gasification [15][16][17][18], hydrogen rich mixtures of gases [7], CO rich fuels [19][20][21][22]. Even though the performance with those unconventional fuels has always been high, http://dx.doi.org/10.1016/j.apenergy.2015.04.126 0306-2619/Ó 2015 Elsevier Ltd. All rights reserved.…”