High temperature desulfurization over nano-scale high surface area ceria for application in SOFC

Kempegowda, Rajesh S.; Laosiripojana, Navadol; Assabumrungrat, Suttichai

doi:10.1007/s11814-008-0040-3

Cited by 25 publications

(16 citation statements)

References 23 publications

(30 reference statements)

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“…It stands to reason that the outstanding performance of the formulations developed in this work is borne out of the fact that there is another mechanism for sulfur resistance. It is well-known that ceria itself is capable of forming an oxysulfide [27][28][29][30]. Therefore, in reducing environments, due cognizance should be given to the highly favorable thermodynamics of CeO 2 -H 2 -H 2 S system.…”

Section: Ru + H 2 Smentioning

confidence: 99%

A Phenomenological Study on the Synergistic Role of Precious Metals and the Support in the Steam Reforming of Logistic Fuels on Monometal Supported Catalysts

Azad

Sundararajan

2010

Advances in Materials Science and Engineering

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Clean power source utilizing vast logistic fuel reserves (jet fuels, diesel, and coal) would be the main driver in the 21st century for high efficiency. Fuel processors are required to convert these fuels into hydrogen-rich reformate for extended periods in the presence of sulfur, and deliver hydrogen with little or no sulfur to the fuel cell stack. However, the jet and other logistic fuels are invariably sulfur-laden. Sulfur poisons and deactivates the reforming catalyst and therefore, to facilitate continuous uninterrupted operation of logistic fuel processors, robust sulfur-tolerant catalysts ought to be developed. New noble metal-supported ceria-based sulfur-tolerant nanocatalysts were developed and thoroughly characterized. In this paper, the performance of single metal-supported catalysts in the steam-reforming of kerosene, with 260 ppm sulfur is highlighted. It was found that ruthenium-based formulation provided an excellent balance between hydrogen production and stability towards sulfur, while palladium-based catalyst exhibited rapid and steady deactivation due to the highest propensity to sulfur poisoning. The rhodium supported system was found to be most attractive in terms of high hydrogen yield and long-term stability. A mechanistic correlation between the role of the nature of the precious metal and the support for generating clean desulfurized -rich reformate is discussed.

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Section: Ru + H 2 Smentioning

confidence: 99%

A Phenomenological Study on the Synergistic Role of Precious Metals and the Support in the Steam Reforming of Logistic Fuels on Monometal Supported Catalysts

Azad

Sundararajan

2010

Advances in Materials Science and Engineering

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“…Production of water showed an undesirable effect for ceria-coated anode, since the water probably competes with H 2 S to be absorbed by ceria. Higher amounts of water maintained ceria in it fully oxidized state, making it difficult to absorb H 2 S [21,24,25].…”

Section: Button Cells Analysismentioning

confidence: 99%

Electrochemical impedance study of the poisoning behaviour of Ni-based anodes at low concentrations of H2S in an MCFC

Devianto

Simonetti²,

McPhail³

et al. 2012

International Journal of Hydrogen Energy

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“…It is well known that ceria itself is capable of forming an oxysulfide [26][27][28][29]. Therefore, in reducing environments, due cognizance, should be given to the highly favorable thermodynamics of CeO 2 -H 2 -H 2 S system…”

Section: Steam-reforming Characteristicsmentioning

confidence: 99%

A Phenomenological Study on the Synergistic Role of Precious Metals in the Steam Reforming of Logistic Fuels on Bimetal-Supported Catalysts

Azad

Sundararajan

2011

Advances in Materials Science and Engineering

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Fuel processors are required to convert sulfur-laden logistic fuels into hydrogen-rich reformate and deliver to the fuel cell stack with little or no sulfur. Since sulfur poisons and deactivates the reforming catalyst, robust sulfur-tolerant catalysts ought to be developed. In this paper, the development, characterization and evaluation of a series of reforming catalysts containing two noble metals (with total metal loading not exceeding 1 weight percent) supported on nanoscale ceria for the steam-reforming of kerosene is reported. Due to inherent synergy, a bimetallic catalyst is superior to its monometallic analog, for the same level of loading. The choice of noble metal combination in the bimetallic formulations plays a vital and meaningful role in their performance. Presence of ruthenium and/or rhodium in formulations containing palladium showed improved sulfur tolerance and significant enhancement in their catalytic activity and stability. Rhodium was responsible for higher hydrogen yields in the logistic fuel reformate. Duration of steady hydrogen production was higher in the case of RhPd (75 h) than for RuPd (68 h); hydrogen generation was stable over the longest period (88 h) with RuRh containing no Pd. A mechanistic correlation between the characteristic role of precious metals in the presence of each other is discussed.

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High temperature desulfurization over nano-scale high surface area ceria for application in SOFC

Cited by 25 publications

References 23 publications

A Phenomenological Study on the Synergistic Role of Precious Metals and the Support in the Steam Reforming of Logistic Fuels on Monometal Supported Catalysts

A Phenomenological Study on the Synergistic Role of Precious Metals and the Support in the Steam Reforming of Logistic Fuels on Monometal Supported Catalysts

Electrochemical impedance study of the poisoning behaviour of Ni-based anodes at low concentrations of H2S in an MCFC

A Phenomenological Study on the Synergistic Role of Precious Metals in the Steam Reforming of Logistic Fuels on Bimetal-Supported Catalysts

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