Effect of steam content on nickel nano-particle sintering and methane reforming activity of Ni–CZO anode cermets for internal reforming SOFCs

Dasari, Hari Prasad; Park, S.Y.; Ji, Hyunjin; Kim, H.-R.; Son, Ji‐Won; Kim, B.-K.; Lee, H.-W.; Lee, J.-H.

doi:10.1016/j.apcata.2011.10.035

Cited by 35 publications

(13 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…27−32 It was reported that even the dilution of methane fuel with inert gases could cause a significant change in the anode reaction mechanism, resulting in a coking resistance effect. 30,33,34 The above information suggests that there is great potential to take advantage of the diluent components, both active O 2 and inert N 2 , in low-concentration CBM for suppressing coke formation. In addition, the performance of SOFCs can be improved by optimizing the anode microstructure and the operating conditions.…”

Section: Introductionmentioning

confidence: 97%

“…Meanwhile, the efforts to increase the coking resistance of Ni-based cermet anodes have never waned. , The application of a catalyst layer with high catalytic activity for the reforming or partial oxidation of methane over the anode has been proven to be effective in coking resistance and performance improvement. − For example, LiLaNi–Al 2 O 3 /Cu, a cost-effective catalyst was developed for anode catalyst layers with high methane-reforming activity, good coking resistance, high electronic conductivity, and excellent thermomechanical compatibility with Ni-based anodes. − Herein, we adopted this LiLaNi–Al 2 O 3 /Cu anode catalyst layer and extended its application to the conversion of oxygen-bearing CBM in SOFCs. Another strategy is the addition of oxygen-containing gases, such as steam, CO 2 , O 2 , or air, into the fuel gas to increase the oxygen-to-carbon ratio and thereby avoid the coke formation thermodynamically. − It was reported that even the dilution of methane fuel with inert gases could cause a significant change in the anode reaction mechanism, resulting in a coking resistance effect. ,, The above information suggests that there is great potential to take advantage of the diluent components, both active O 2 and inert N 2 , in low-concentration CBM for suppressing coke formation. In addition, the performance of SOFCs can be improved by optimizing the anode microstructure and the operating conditions. − …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Direct Operation of Solid Oxide Fuel Cells on Low-Concentration Oxygen-Bearing Coal-Bed Methane with High Stability

et al. 2018

View full text Add to dashboard Cite

This paper studies the electrochemical feasibility of the direct conversion of low-concentration, oxygen-bearing coal-bed methane (CBM, 30 vol % CH 4 ) to electricity via solid oxide fuel cells (SOFCs). A fuel cell with the LiLaNi−Al 2 O 3 /Cu catalyst layer was developed, and a maximum power output of ∼1068 mW cm −2 was achieved at 850 °C using 30 vol % CBM fuel, which is only modestly lower than that from a cell based on hydrogen fuel. The stability test showed that the cell operation was quite stable during the 120-h test period, which is ∼40-fold longer than that of the cell without catalyst layer. The partial oxidation of methane (POM) occurring in the anode may play an important role when using 30 vol % CBM fuel, which not only supplies highly active gaseous fuels (H 2 and CO) but also suppresses the carbon deposition on the anode. By modifying the anode with a LiLaNi−Al 2 O 3 /Cu catalyst layer, the POM of 30 vol % CBM was further promoted and the carbon deposition over the anode was mitigated more efficiently. Therefore, the strategy of direct conversion of low-concentration, oxygen-bearing CBM via the SOFCs with an anode catalyst layer may pave an alternative way to utilize this abundant resource efficiently and cleanly.

show abstract

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Direct Operation of Solid Oxide Fuel Cells on Low-Concentration Oxygen-Bearing Coal-Bed Methane with High Stability

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The most attractive feature of SOFCs is their fuel flexibility and high efficiencies, even cells running directly on hydrocarbons, including liquid fuels. 1 As shown in Equations ( 1), (2), and (3), commonly used reforming techniques include CO 2 reforming (or dry reforming), 2 steam reforming, 3,4 and partial oxidation reforming (passing air or oxygen). 5 The main reaction details of the reforming process are summarized below 6 :…”

Section: Introductionmentioning

confidence: 99%

“…The most attractive feature of SOFCs is their fuel flexibility and high efficiencies, even cells running directly on hydrocarbons, including liquid fuels 1 . As shown in Equations (), (), and (), commonly used reforming techniques include CO 2 reforming (or dry reforming), 2 steam reforming, 3,4 and partial oxidation reforming (passing air or oxygen) 5 . The main reaction details of the reforming process are summarized below 6 :

{CH}_{4} goodbreak+ {CO}_{2} \to 2 CO goodbreak+ 2 H_{2} {ΔH}_{298 normalk} goodbreak= goodbreak+ 247 kJ / mol

{CH}_{4} goodbreak+ H_{2} normalO \to CO goodbreak+ 3 H_{2} {ΔH}_{298 normalk} goodbreak= goodbreak+ 228 kJ / mol

{CH}_{4} goodbreak+ 1 / 2 O_{2} \to CO goodbreak+ 2 H_{2} {ΔH}_{298 normalk} goodbreak= goodbreak- 22.6 kJ / mol

…”

Section: Introductionmentioning

confidence: 99%

Catalytic performance of Cu‐Ni /La _0. ₇₅ Sr ₀ _. ₂₅ Cr ₀ _. ₅ Mn ₀ _.
Liu
¹
,
Yu
²

2022
Intl J of Energy Research
6
0
0
0
View full text Add to dashboard Cite

La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3-δ (LSCM) powders with perovskite structures were prepared by the glycine-nitrate process (GNP), and Cu-Ni/LSCM catalyst with Ni and Cu atomic mass ratios of 3:1, 4:1, 5:1, and 6:1 was prepared by impregnation. The structures and properties of the samples were characterized and the Cu/Ni-LSCM catalysts were subjected to dry methane reforming at 600 C/700 C. X-ray diffraction (XRD) patterns showed that the samples contained perovskite structure and Cu-Ni alloy phases. Hydrogen-based temperature-programmed reduction (H 2 -TPR) showed that the reduction temperature of CuO/NiO-LSCM decreased as the Cu content increased. X-ray photoelectron spectroscopy (XPS) results of Cu and Ni elements showed Cu-Ni alloy formed after reduction, and the extent of carbon deposition on the spent catalysts was measured using thermogravimetric analysis (TGA). The effect of wet impregnation on the structure and properties of Cu-Ni/LSCM composite anodes was investigated. The results showed that the four Cu-Ni/LSCM catalysts had slightly different methane conversions during dry methane reforming at 600/700 C. The conversion of methane increased first and then decreased as Ni/Cu mass ratio increased and the maximum was 88.75%. The best catalytic performance was obtained at sample 3(Cu:Ni = 1:5 in mass ratios) for its largest surface area, which was 10.797 m 2 /g and the highest Ni content.

show abstract

“…As mentioned earlier (Sections 2.4 and 2.4.1.1.1), the sintering issues with Ni, as well as the link between increasing particle size and carbon formation have been well documented [8,54,56]. Therefore, significant [82,83], perovskites (ABO3) [84][85][86], hexaaluminates (MO•6(Al2O3)) [87][88][89], and pyrochlores (A2B2O7) [10,14].…”

Section: Issues With Traditional Supported Metal Catalystsmentioning

confidence: 78%

Steam Reforming of CH4 Using Ni- Substituted Pyrochlore Catalysts

Haynes¹

View full text Add to dashboard Cite

The steam reforming of methane (SMR) continues to remain an important industrial reaction for large-scale production of H2 as well as synthesis gas mixtures which can be used for the production of useful chemicals (e.g. methanol). Although SMR is a rather mature technology, traditional nickel based catalysts used industrially are subjected to severe temperatures and reaction conditions, which lead to irreversible activity loss through sintering, support collapse, and carbon formation. Pyrochlore-based mixed oxide have been identified as refractory materials that can be modified through the substitution of catalytic metals and other promoting species into the structure to mitigate these issues causing deactivation. For this study, a lanthanum zirconate pyrochlore catalyst was substituted with Ni to determine whether the oxide structure could effectively stabilize the activity of the catalytic metal during the SMR. The effect of different variables including calcination temperature, a comparison of a substituted versus supported Ni pyrochlore catalyst, Ni weight loading, and Sr promotion have been evaluated to determine the location of the Ni in the structure, and their effect on catalytic behavior.

show abstract

Effect of steam content on nickel nano-particle sintering and methane reforming activity of Ni–CZO anode cermets for internal reforming SOFCs

Cited by 35 publications

References 59 publications

Direct Operation of Solid Oxide Fuel Cells on Low-Concentration Oxygen-Bearing Coal-Bed Methane with High Stability

Direct Operation of Solid Oxide Fuel Cells on Low-Concentration Oxygen-Bearing Coal-Bed Methane with High Stability

Catalytic performance of Cu‐Ni /La _0. ₇₅ Sr ₀ _. ₂₅ Cr ₀ _. ₅ Mn ₀ _.
Liu
¹
,
Yu
²

2022
Intl J of Energy Research
6
0
0
0
View full text Add to dashboard Cite

Steam Reforming of CH4 Using Ni- Substituted Pyrochlore Catalysts

Contact Info

Product

Resources

About

Effect of steam content on nickel nano-particle sintering and methane reforming activity of Ni–CZO anode cermets for internal reforming SOFCs

Cited by 35 publications

References 59 publications

Direct Operation of Solid Oxide Fuel Cells on Low-Concentration Oxygen-Bearing Coal-Bed Methane with High Stability

Direct Operation of Solid Oxide Fuel Cells on Low-Concentration Oxygen-Bearing Coal-Bed Methane with High Stability

Catalytic performance of Cu‐Ni /La 0. 75 Sr 0 . 25 Cr 0 . 5 Mn 0 . Liu1, Yu2 2022Intl J of Energy Research6000View full textAdd to dashboardCite

Steam Reforming of CH4 Using Ni- Substituted Pyrochlore Catalysts

Contact Info

Product

Resources

About

Catalytic performance of Cu‐Ni /La _0. ₇₅ Sr ₀ _. ₂₅ Cr ₀ _. ₅ Mn ₀ _.
Liu
¹
,
Yu
²

2022
Intl J of Energy Research
6
0
0
0
View full text Add to dashboard Cite