Enhancement of highly-concentrated hydrogen productivity in chemical looping steam methane reforming using Fe-substituted LaCoO3

Lee, Minbeom; Lim, Hyun Suk; Kim, Yikyeom; Lee, Jae Woo

doi:10.1016/j.enconman.2020.112507

Cited by 64 publications

(17 citation statements)

References 56 publications

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“…This implies that the thermodynamic properties of the oxygen carrier were altered by the inclusion of Co in the material, and its ability to split carbon dioxide or steam was reduced. Preliminary results using oxygen carriers that had different ratios of Fe/Co indicate that the amount of Co in the material should be relatively low to regenerate a large fraction of the lattice oxygen by carbon dioxide or steam, similar to observations made elsewhere …”

supporting

confidence: 73%

Chemical Looping Partial Oxidation of Methane: Reducing Carbon Deposition through Alloying

2022

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In chemical looping, Fe-containing oxygen carriers can catalyze as a side reaction the decomposition of methane, which results in the deposition of carbon on their surface with multiple adverse effects. In this work, we propose a strategy to reduce the extent of carbon deposition by using Co as a second redox-active metal that forms a bimetallic phase with Fe during reduction. We show for a perovskite-based oxygen carrier that the formation of the bimetallic Fe–Co phase improves the dispersion and decreases the size of iron within the material, which may influence its catalytic effect on the decomposition of methane (in addition to potential changes in its electronic structure).

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supporting

confidence: 73%

Chemical Looping Partial Oxidation of Methane: Reducing Carbon Deposition through Alloying

2022

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“…Lee et al [327] applied B-site substituted LaCo 0.6 B 0.4 O 3 (B = Fe, Mn, Ni) oxygen carriers to the chemical looping steam reforming process and investigated the effects of different B-site substitutions on the performance of oxygen carriers. The experimental results showed that the introduction of iron promoted the oxidation of the oxygen carrier by steam and promoted the migration of lattice oxygen from the bulk phase to the surface oxygen vacancies, so that the LaCo 0.6 Fe 0.4 O 3 oxygen carrier has good reactivity and cyclic stability.…”

Section: Other Oxygen Carriermentioning

confidence: 99%

Chemical looping reforming: process fundamentals and oxygen carriers

et al. 2022

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Chemical looping reforming (CLR) provides a viable process intensification approach for clean and efficient syngas production from carbonaceous fuel with inherent gas–gas separation. The rational design of metal oxide-based oxygen carriers and the scale-up of associated CLR reactor systems play important roles in CLR process development. This review first introduces the concept and advantages of CLR as well as its historical development. The process fundamentals, including basic schemes, reaction stoichiometry, thermodynamics, kinetics and reactor system design, are reviewed. The integral approach for CLR process development is illustrated, showing that the design and compatibility of oxygen carriers and reactor systems are critical for CLR performance. The reaction principle during the reduction of oxygen carriers is discussed, followed by strategies for improving the redox reactivity and stability. We further review and discuss the latest exciting advances on this subject with the purpose of illustrating factors that govern fundamental mechanisms in the redox reaction chemistry of oxygen carriers and their design principles for sustained chemical looping reactor applications. It is expected that these new advances will inspire more effective oxygen carriers and efficient reactor systems for the development and deployment of various CLR processes.

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“…However, the thermal stability and reactivity of single metal OCs are poor during the redox cycle, which cannot meet the long‐term operational requirements. As for composite metal oxides, due to their synergistic effect or characteristic complementarity, they show better reactivity than single metal oxides and have been studied more extensively, including perovskite (eg, La 0.7 Sr 0.3 FeO 3 , 7 LaCoO 3 , 8 La 1‐y Ca y Ni 0.9 Cu 0.1 O 3 , 9 etc. ), hexaaluminate, 10 spinel (eg, Cu 0.5 Co 0.5 Fe 2 O 4 , 11 NiFe 2 O 4 , 12,13 etc.)…”

Section: Introductionmentioning

confidence: 99%

Study on the redox performance of Cu and Ce‐doped CoFe ₂ O ₄ as oxygen carriers for chemical looping hydrogen generation

Gao

Jia

et al. 2022

Intl J of Energy Research

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Summary In the chemical looping hydrogen generation process, CoFe2O4 is regarded as one of the most excellent candidates for oxygen carriers (OCs). In this paper, the synergistic effect of Cu and Ce added to CoFe2O4 was studied. The doping of Cu and Ce improved the reactivity of CoFe2O4 with methane, and also increased the hydrogen yield and purity. The results indicated that the introduction of Cu and Ce facilitated the deep reduction of CoFe2O4, which was ascribed to the enhanced migration capacity of lattice oxygen. In addition, the addition of Cu inhibited the decomposition of CH4 and alleviated carbon deposition. The Cu4Ce4‐CoFe had a suitable Cu/Ce mass ratio, which was more conducive to the formation of excellent synergistic effect to enhance hydrogen production and weaken carbon deposition. The Cu4Ce4‐CoFe exhibited outstanding H2 yield (15.42 mmol·g−1) and H2 purity (99.13%). In addition, the reactivity of OC decreased to some extent with the cyclic experiment when the Cu4Ce4‐CoFe was used, the H2 yield decreased from ∼15.21 to ∼10.86 mmol·g−1 over 10 experimental cycles. In conclusion, Cu and Ce co‐doping is an effective strategy to obtain OCs with preeminent hydrogen production performance and anti‐carbon deposition performance.

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Enhancement of highly-concentrated hydrogen productivity in chemical looping steam methane reforming using Fe-substituted LaCoO3

Cited by 64 publications

References 56 publications

Chemical Looping Partial Oxidation of Methane: Reducing Carbon Deposition through Alloying

Chemical Looping Partial Oxidation of Methane: Reducing Carbon Deposition through Alloying

Chemical looping reforming: process fundamentals and oxygen carriers

Study on the redox performance of Cu and Ce‐doped CoFe ₂ O ₄ as oxygen carriers for chemical looping hydrogen generation

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Enhancement of highly-concentrated hydrogen productivity in chemical looping steam methane reforming using Fe-substituted LaCoO3

Cited by 64 publications

References 56 publications

Chemical Looping Partial Oxidation of Methane: Reducing Carbon Deposition through Alloying

Chemical Looping Partial Oxidation of Methane: Reducing Carbon Deposition through Alloying

Chemical looping reforming: process fundamentals and oxygen carriers

Study on the redox performance of Cu and Ce‐doped CoFe 2 O 4 as oxygen carriers for chemical looping hydrogen generation

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Study on the redox performance of Cu and Ce‐doped CoFe ₂ O ₄ as oxygen carriers for chemical looping hydrogen generation