Study on steam reforming of CH4 and C2 hydrocarbons and carbon deposition on Ni-YSZ cermets

Takeguchi, Tatsuya; Kani, Yukimune; Yano, Toshiro; Kikuchi, Ryuji; Eguchi, Koichi; Tsujimoto, K.; Uchida, Y.; Ueno, Akira; Omoshiki, Koiji; Aizawa, Masanobu

doi:10.1016/s0378-7753(02)00471-8

Cited by 310 publications

(181 citation statements)

References 23 publications

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“…The additive effect of third component such as MgO, CaO, SrO and CeO 2 has been studied for Ni-yttria-stabilized zirconia (Ni-YSZ) cermet to prevent the carbon deposition. [8][9][10] The influence of precious metal additives was also reported. 11 The third component altered the kinetic parameters of steam reforming of CH 4 , and some additives effectively suppressed the carbon deposition without the deterioration of catalytic activity.…”

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confidence: 99%

Redox-Induced Self-Modification of Cermet Anodes of Ni–CeO₂-Based Oxide for Solid Oxide Fuel Cells

Matsui

Eguchi

Shirai

et al. 2017

J. Electrochem. Soc.

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Recently, the strong chemical interaction between Ni and GDC (Gd 2 O 3 −CeO 2 ) was reported for the cermet anode of Ni−GDC in solid oxide fuel cells (SOFCs); 1 CeO 2 species migrated on the Ni surface after exposure to the reducing atmosphere. This surface modification of nickel affected the catalytic properties for carbon deposition and CO adsorption. Generally, such a chemical interaction is promoted by the oxidation-reduction (redox) treatment. In this study, then, the influence of redox treatment on catalytic and electrochemical properties of Ni-GDC cermets was investigated in detail to establish a new design concept of anodes. The Ni−GDC cermet subjected to the redox treatment showed high tolerance to carbon deposition. Furthermore, the redox treatment did not affect the mechanism of electrochemical hydrogen oxidation in humidified hydrogen atmospheres. We also demonstrated the stable power generation of the single cell employing the optimized Ni−GDC anode at 1000 • C in a wet methane atmosphere with a steam to carbon ratio of 0.1.

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confidence: 99%

Redox-Induced Self-Modification of Cermet Anodes of Ni–CeO₂-Based Oxide for Solid Oxide Fuel Cells

Matsui

Eguchi

Shirai

et al. 2017

J. Electrochem. Soc.

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“…Nickel in a conventional Ni/YSZ anode shows high catalytic activity for C-H bond dissociation and C-C bond formation in hydrocarbons. Formation of C-C bond, known as coking, deactivates the Ni/YSZ anode catalyst through the loss of active sites and microstructural damage [23,24]. A number of approaches were investigated to suppress the coking and delay the anode deactivation including the addition of steam [25], dilution of hydrocarbon fuel with CO 2 [26,27] …”

Section: Open Accessmentioning

confidence: 99%

La0.6Sr0.4Co0.2Fe0.8O3 Perovskite: A Stable Anode Catalyst for Direct Methane Solid Oxide Fuel Cells

Mirzababaei

Chuang

2014

Catalysts

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Direct methane solid oxide fuel cells, operated by supplying methane to a Ni/YSZ anode, suffer from degradation via accumulation of carbon deposits on the Ni surface. Coating a 40 µm thin film of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF) perovskite on the Ni/YSZ anode surface decreased the amount of carbon deposits, slowing down the degradation rate. The improvement in anode durability could be related to the oxidation activity of LSCF which facilitates oxidation of CH 4 and carbon deposits. Analysis of the crystalline structure of LSCF revealed that LSCF was stable in the reducing anode environment under H 2 and CH 4 flow at 750 °C and retained its perovskite structure throughout the 475 h long-term stability test.

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“…The region of carbon deposition in the C/H/O diagram was determined from thermodynamic calculations in the temperature range of 400-1200°C at 1 atm ( Fig. 3) 8) . At 1000°C or higher, carbon deposition occurs in the C-rich region from the H2/CO line.…”

Section: Equilibrium Conversion and Selectivity Formentioning

confidence: 99%

Solid Oxide Fuel Cell as a Multi-fuel Applicable Power Generation Device

Kikuchi

Eguchi

2004

J. Jpn. Petrol. Inst.

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The solid oxide fuel cell (SOFC) has high conversion efficiency, and is quite attractive from the viewpoint of fuel flexibility, especially the possibility of internal reforming of methane and other hydrocarbons for power generation. The high temperature operation of SOFCs allows the reform of hydrocarbon fuels on the fuel electrode internally in a SOFC module. The power generation characteristics of SOFCs with internal steam reforming of methane were investigated. Steam reforming over a Ni-YSZ (yttria-stabilized zirconia) cermet catalyst attained almost the equilibrium conversion and selectivity in a fixed bed reactor at 1000°C. Internal reforming of hydrocarbons was incomplete because of the limited contact time with the thick layer of the Ni cermet electrode. Therefore, the fuel cell supplied with pre-reformed gas to the anode always produced a lower terminal voltage due to insufficient conversion of the fuel compared with that supplied with post-reformed gas at a given current density. Methane internal reforming proceeded without deterioration with time, whereas power generation with ethane and ethylene was deteriorated by carbon deposition even at high steam-to-carbon ratio. The carbon deposition region and equilibrium partial pressure of oxygen in the C _ H _ O diagram were estimated from thermodynamic data. The characteristics of CH4 steam reforming, carbon deposition, and power generation with Ni-YSZ cermet anodes modified by MgO, CaO, SrO, CeO2, and precious metals were examined. CaO addition was effective for suppressing carbon deposition and promoting CH4 steam reforming, although the anode electrochemical activity was slightly deteriorated. Ru and Pt addition enhanced steam reforming and suppressed carbon deposition without deteriorating the anode electrochemical activity. The impedance related to gas diffusion was significantly reduced by precious metal additions, indicating that the stability of the anode catalyst was considerably improved since no carbon was deposited.

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Study on steam reforming of CH4 and C2 hydrocarbons and carbon deposition on Ni-YSZ cermets

Cited by 310 publications

References 23 publications

Redox-Induced Self-Modification of Cermet Anodes of Ni–CeO₂-Based Oxide for Solid Oxide Fuel Cells

Redox-Induced Self-Modification of Cermet Anodes of Ni–CeO₂-Based Oxide for Solid Oxide Fuel Cells

La0.6Sr0.4Co0.2Fe0.8O3 Perovskite: A Stable Anode Catalyst for Direct Methane Solid Oxide Fuel Cells

Solid Oxide Fuel Cell as a Multi-fuel Applicable Power Generation Device

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Study on steam reforming of CH4 and C2 hydrocarbons and carbon deposition on Ni-YSZ cermets

Cited by 310 publications

References 23 publications

Redox-Induced Self-Modification of Cermet Anodes of Ni–CeO2-Based Oxide for Solid Oxide Fuel Cells

Redox-Induced Self-Modification of Cermet Anodes of Ni–CeO2-Based Oxide for Solid Oxide Fuel Cells

La0.6Sr0.4Co0.2Fe0.8O3 Perovskite: A Stable Anode Catalyst for Direct Methane Solid Oxide Fuel Cells

Solid Oxide Fuel Cell as a Multi-fuel Applicable Power Generation Device

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Redox-Induced Self-Modification of Cermet Anodes of Ni–CeO₂-Based Oxide for Solid Oxide Fuel Cells

Redox-Induced Self-Modification of Cermet Anodes of Ni–CeO₂-Based Oxide for Solid Oxide Fuel Cells