Ammonia-mediated suppression of coke formation in direct-methane solid oxide fuel cells with nickel-based anodes
Identifieur interne : 005524 ( PascalFrancis/Curation ); précédent : 005523; suivant : 005525Ammonia-mediated suppression of coke formation in direct-methane solid oxide fuel cells with nickel-based anodes
Auteurs : WEI WANG [République populaire de Chine] ; RAN RAN [République populaire de Chine] ; CHAO SU [Australie] ; YOUMIN CUO [France] ; David Farrusseng [France] ; ZONGPING SHAO [République populaire de Chine, Australie]Source :
- Journal of power sources [ 0378-7753 ] ; 2013.
Descripteurs français
- Pascal (Inist)
- Wicri :
English descriptors
- KwdEn :
Abstract
In this study, we report a novel approach for suppressing coke formation in direct-methane solid oxide fuel cells (SOFCs) with a conventional nickel cermet anode by simply adding ammonia to the fuel gas. Because ammonia preferentially occupies the acidic sites of the anode catalyst materials, a significant decrease in the coke formation rate is realized by introducing ammonia into the methane gas. In addition, hydrogen, a decomposition product of ammonia, also acts as an additional fuel for the SOFCs, resulting in high cell performance. At 700 °C, the coke formation rate over the Ni-YSZ anode is suppressed by 71% after the addition of 33.3% NH3 into CH4. Suppressed coke formation is also observed for other Ni catalysts such as Ni/Al2O3, a common catalyst for methane reforming that has been successfully used as the anode catalyst layer for SOFCs operating on methane, which suggests that introducing NH3 as an additive gas is a general method for suppressing the coke formation. The addition of ammonia can also effectively improve the power output and operational stability and offers a novel means for developing new coke-resistant SOFCs operating on widely available hydrocarbons for clean power generation to realize a sustainable future.
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<term>Nickel</term>
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<front><div type="abstract" xml:lang="en">In this study, we report a novel approach for suppressing coke formation in direct-methane solid oxide fuel cells (SOFCs) with a conventional nickel cermet anode by simply adding ammonia to the fuel gas. Because ammonia preferentially occupies the acidic sites of the anode catalyst materials, a significant decrease in the coke formation rate is realized by introducing ammonia into the methane gas. In addition, hydrogen, a decomposition product of ammonia, also acts as an additional fuel for the SOFCs, resulting in high cell performance. At 700 °C, the coke formation rate over the Ni-YSZ anode is suppressed by 71% after the addition of 33.3% NH<sub>3</sub>
into CH<sub>4</sub>
. Suppressed coke formation is also observed for other Ni catalysts such as Ni/Al<sub>2</sub>
O<sub>3</sub>
, a common catalyst for methane reforming that has been successfully used as the anode catalyst layer for SOFCs operating on methane, which suggests that introducing NH<sub>3</sub>
as an additive gas is a general method for suppressing the coke formation. The addition of ammonia can also effectively improve the power output and operational stability and offers a novel means for developing new coke-resistant SOFCs operating on widely available hydrocarbons for clean power generation to realize a sustainable future.</div>
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<fC01 i1="01" l="ENG"><s0>In this study, we report a novel approach for suppressing coke formation in direct-methane solid oxide fuel cells (SOFCs) with a conventional nickel cermet anode by simply adding ammonia to the fuel gas. Because ammonia preferentially occupies the acidic sites of the anode catalyst materials, a significant decrease in the coke formation rate is realized by introducing ammonia into the methane gas. In addition, hydrogen, a decomposition product of ammonia, also acts as an additional fuel for the SOFCs, resulting in high cell performance. At 700 °C, the coke formation rate over the Ni-YSZ anode is suppressed by 71% after the addition of 33.3% NH<sub>3</sub>
into CH<sub>4</sub>
. Suppressed coke formation is also observed for other Ni catalysts such as Ni/Al<sub>2</sub>
O<sub>3</sub>
, a common catalyst for methane reforming that has been successfully used as the anode catalyst layer for SOFCs operating on methane, which suggests that introducing NH<sub>3</sub>
as an additive gas is a general method for suppressing the coke formation. The addition of ammonia can also effectively improve the power output and operational stability and offers a novel means for developing new coke-resistant SOFCs operating on widely available hydrocarbons for clean power generation to realize a sustainable future.</s0>
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<fC02 i1="01" i2="X"><s0>001D06D03E</s0>
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<fC02 i1="03" i2="X"><s0>001D05C</s0>
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<fC02 i1="04" i2="X"><s0>230</s0>
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<s5>01</s5>
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<fC03 i1="01" i2="X" l="ENG"><s0>Coke</s0>
<s5>01</s5>
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<s5>02</s5>
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<s5>02</s5>
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<s5>02</s5>
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<s5>03</s5>
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<s5>03</s5>
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<s5>03</s5>
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<s5>04</s5>
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<s5>04</s5>
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<s5>04</s5>
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<s2>FX</s2>
<s5>22</s5>
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<s2>FX</s2>
<s5>22</s5>
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<s5>23</s5>
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<s2>FX</s2>
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<s5>05</s5>
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<s2>NC</s2>
<s5>05</s5>
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<fC07 i1="01" i2="X" l="SPA"><s0>Metal transición</s0>
<s2>NC</s2>
<s5>05</s5>
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<fN21><s1>217</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
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