Methane reforming kinetics within a Ni–YSZ SOFC anode support

Hecht, Ethan; Gupta, Gaurav; Zhu, Huayang; Dean, Anthony M.; Kee, Robert J.; Maier, Luba I.; Deutschmann, Olaf

doi:10.1016/j.apcata.2005.08.003

Cited by 330 publications

(253 citation statements)

References 22 publications

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“…Numerous SOFC models considering the intricate interdependency among ionic and electronic conduction, gas transport phenomena, and electrochemical processes have been reported in the literatures for pure hydrogen, syngas or methane [10][11][12][13][14][15][16][17][18][19][20]. Hecht et al [21] further reported a multi-step heterogeneous elementary reaction mechanism for CH 4 reforming using Ni as catalyst. Janardhanan et al [22] developed an extended version of the mechanism evaluated for temperatures between 220 o C and 1700 o C. We also developed a transient elementary reaction model coupled with anodic elementary heterogeneous reactions (adsorption/desorption and water-gas-shift reactions) and electrochemical kinetics for syngas operation (mixtures of H 2 , H 2 O, CO, CO 2 and N 2 ) based on an anode supported button cell [3].…”

Section: Dcfcmentioning

confidence: 98%

Experimental characterization and elementary reaction modeling of solid oxide electrolyte direct carbon fuel cell

Shi

Wang

et al. 2013

Journal of Power Sources

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A detailed mechanistic model for solid oxide electrolyte direct carbon fuel cell (SO-DCFC) is developed while considering the thermo-chemical and electrochemical elementary reactions in both the carbon bed and the SOFC, as well as the meso-scale transport processes within the carbon bed and the SOFC electrode porous structures. The model is validated using data from a fixed bed carbon gasification experiment and the SO-DCFC performance testing experiments carried out using different carrier gases and * Corresponding author. Tel.: +86-10-62789955; Fax: +86-10-62770209.Email: shyx@tsinghua.edu.cn.2 at various temperatures. The analyses of the experimental and modeling results indicate the strong influence of the carrier gas on the cell performance. The coupling between carbon gasification and electrochemical oxidation on the SO-DCFC performance that results in an unusual transition zone in the cell polarization curve was predicted by the model, and analyzed in detail at the elementary reaction level. We conclude that the carbon bed physical properties such as the bed height, char conversion ratio and fuel utilization, as well as the temperature significantly limit the performance of the SO- DCFC.Key words: solid oxide electrolyte; direct carbon fuel cell; elementary reaction; modeling; heterogeneous chemistry This work is focuses on the solid oxide electrolyte direct carbon fuel cells (SO-DCFC) which are capable of conversing chemical energy in the solid carbon fuel into electricity.These offer a number of advantages over the traditional carbon conversion technologies 3 as well as alternative DCFCs such as: the abundance of the fuel source, high theoretical efficiency, high CO 2 emission reduction potential, relatively higher reaction activity ascribed to its high operating temperatures, and avoidance of liquid electrolyte consumption, leakage and corrosion [3]. Due to these advantages, some researchers have investigated DFFCs for application in large-scale power plants [4,5] considering their potential merits for high efficiency and emission reduction.SO-DCFC performance improvement relies on optimal electrochemical reactions, carbon gasification and mass transport processes. Since experimental studies on SO-DCFC are rather complex, expensive, and time-consuming, comprehensive mathematical models are essential for the technology development. A validated mechanistic model would offer means to gain insight into the complex physical phenomena governing fthe uel cell performance that is not readily accessible experimentally, and it can also be useful tool for cell design and operating condition optimization.Modeling and experimental studies of SO-DCFCs have been reported recently by several researchers [6][7][8][9]. Numerous SOFC models considering the intricate interdependency among ionic and electronic conduction, gas transport phenomena, and electrochemical processes have been reported in the literatures for pure hydrogen, syngas or methane [10][11][12][13][14][15][16][17][18][19][20]. Hecht et al. [21]...

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Section: Dcfcmentioning

confidence: 98%

Experimental characterization and elementary reaction modeling of solid oxide electrolyte direct carbon fuel cell

Shi

Wang

et al. 2013

Journal of Power Sources

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“…The rate of the pyrolysis reactions depends mainly on the temperature, space velocity and flow conditions in the anodic compartment. Only a few studies have been published on the gas-phase kinetics within the anode channels of SOFC [79][80][81][82][83][84]. Walters et al [79] predicted the propensity of coke formation in the anode channels of SOFC fuelled with dry natural gas by applying a simple gas-phase kinetics model of CH 4 pyrolysis and oxidation, and relating the rate of formation of cyclic hydrocarbon species to the propensity of carbon deposition.…”

Section: Kinetics In the Anode Compartmentmentioning

confidence: 99%

“…Sheng et al [80] demonstrated that substantial gas-phase chemistry occurs in SOFC fuelled directly with n-butane by using a complex kinetics model to predict the conversion of butane pyrolysis. Hecht et al [81] studied reforming of CH 4 on Ni/YSZ anodes and added the non-electrochemical heterogeneous reforming chemistry to a kinetics model including the pyrolysis of the fuel. Gupta et al [82] applied a model including the gas-phase chemistry to predict the performance of a tubular SOFC fuelled with partially reformed JP-8 (Jet) fuel.…”

Section: Kinetics In the Anode Compartmentmentioning

confidence: 99%

Direct Utilization of Liquid Fuels in SOFC for Portable Applications: Challenges for the Selection of Alternative Anodes

2009

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Solid oxide fuel cells (SOFC) have the advantage of being able to operate with fuels other than hydrogen. In particular, liquid fuels are especially attractive for powering portable applications such as small power generators or auxiliary power units, in which case the direct utilization of the fuel would be convenient. Although liquid fuels are easier to handle and transport than hydrogen, their direct use in SOFC can lead to anode deactivation due to carbon formation, especially on traditional nickel/yttria stabilized zirconia (Ni/YSZ) anodes. Significant advances have been made in anodic materials that are resistant to carbon formation but often these materials are less electrochemically active than Ni/YSZ. In this review the challenges of using liquid fuels directly in SOFC, in terms of gas-phase and catalytic reactions within the anode chamber, will be discussed and the alternative anode materials so far investigated will be compared.

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“…This mechanism can be simplified and widely employed for not only SOFC fueled with CO, H2, syngas and CH4, but also SOEC for electrolysis of H2O and CO2 and co-electrolysis of H2O and CO2. [8][9][10][11][12][13] The structures and materials of the anode in SOFEC are completely same as those of the anode in SOFC [10,11]. Thus, the mechanism is adopted to analyze the reaction kinetics of H2, CO and CH4 in the SOFEC model.…”

Section: Anode Heterogeneous Chemistrymentioning

confidence: 99%

Elementary reaction modeling and experimental characterization of solid oxide fuel-assisted steam electrolysis cells

Luo

Shi

et al. 2014

International Journal of Hydrogen Energy

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Methane reforming kinetics within a Ni–YSZ SOFC anode support

Cited by 330 publications

References 22 publications

Experimental characterization and elementary reaction modeling of solid oxide electrolyte direct carbon fuel cell

Experimental characterization and elementary reaction modeling of solid oxide electrolyte direct carbon fuel cell

Direct Utilization of Liquid Fuels in SOFC for Portable Applications: Challenges for the Selection of Alternative Anodes

Elementary reaction modeling and experimental characterization of solid oxide fuel-assisted steam electrolysis cells

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