Chemical looping at the nanoscale — challenges and opportunities

Mishra, Amit Kumar; Li, Fanxing

doi:10.1016/j.coche.2018.05.001

Cited by 50 publications

(26 citation statements)

References 62 publications

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“…In order to avoid secondary reactions, incorporation of metallic promoters, such as Rh or Ni, onto the oxygen carrier has been employed to enhance the surface activity of oxide and favor methane activation. ,,, Such metallic nanoparticles are normally prepared via impregnation routes . However, the elevated temperatures ( e.g., 700–1000 °C) at which chemical looping reforming takes place can lead to nanoparticle agglomeration or Ostwald ripening, which alters the nanoparticle microstructure, decreasing the chemical performance over prolonged cycling.…”

Section: Introductionmentioning

confidence: 99%

La_0.6Sr_0.4Cr_0.8Co_0.2O₃Perovskite Decorated with Exsolved Co Nanoparticles for Stable CO₂Splitting and Syngas Production

Carrillo

Kim

Hood

et al. 2020

ACS Appl. Energy Mater.

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Exsolution is an auspicious processing route for the fabrication of catalytically active nanoparticles that are anchored into the oxide backbone, presenting inherent long-term stability benefits. Here, we show that the exsolution method can be effectively applied to create metallic nanoparticles that improve the syngas production performance under chemical-looping methane reforming coupled with CO2 splitting. The La0.6Sr0.4Cr0.8Co0.2O3 perovskite surface was functionalized with exsolving metallic Co nanoparticles of around 30 nm which exhibited remarkable microstructural stability and uniform dispersion after 28 cycles at 900 °C. The highly dispersed exsolved nanoparticles activated methane partial oxidation, increasing the syngas selectivity and fuel production rates, namely, 44 mLH2 min–1 g–1, which was a twofold improvement over the bare perovskite. In addition, surface modification via exsolution enhanced the CO2-splitting rate, ca. 100 mLCO min–1 g–1, faster than that of state-of-the-art ceria, ca. 70 mLCO min–1 g–1. The results illustrate that exsolved nanoparticles play a critical role in improving the fuel production performance while presenting high durability, denoting its relevance for high-temperature thermocatalytic processes for syngas production.

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Section: Introductionmentioning

confidence: 99%

La_0.6Sr_0.4Cr_0.8Co_0.2O₃Perovskite Decorated with Exsolved Co Nanoparticles for Stable CO₂Splitting and Syngas Production

Carrillo

Kim

Hood

et al. 2020

ACS Appl. Energy Mater.

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“…11 Compared with the SMR process, this technology utilizes metal oxides as redox materials to split the traditional one-step reaction into two consecutive reactions. 12,13 In a typical procedure, oxygen carrier reacts with the reducing agent to release its lattice oxygen in the fuel reactor. Aer that, the reduced oxygen carrier enters the hydrogen production reactor to react with water vapor to generate hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Effect of support on hydrogen generation over iron oxides in the chemical looping process

Gao

Niu

et al. 2021

RSC Adv.

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“…Other factors, which can lead to sintering, include ionic migrations inside the materials, the observed phase changes, and the high exothermicity of the redox reactions and the volume changes resulting from the phase-changes of the active material. By a careful selection of support-active phase combinations and using an advanced oxygen carrier design, it is possible to stabilize these oxygen carriers and mitigate these changes [34,264]. Another factor, which hampers the actual use of these kinds of materials as oxygen carrier particles for a certain application, is their cost and low scalability.…”

Section: New Trends In Oxygen Carrier Research and Developmentmentioning

confidence: 99%

“…These nano-sized materials can also be formed, however, during the chemical looping process itself [265], depending on the oxygen carrier composition. These materials may also be very promising in other future chemical looping processes, where value-added chemicals are generated [34].…”

Section: New Trends In Oxygen Carrier Research and Developmentmentioning

confidence: 99%

Development of Stable Oxygen Carrier Materials for Chemical Looping Processes—A Review

et al. 2020

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This review aims to give more understanding of the selection and development of oxygen carrier materials for chemical looping. Chemical looping, a rising star in chemical technologies, is capable of low CO2 emissions with applications in the production of energy and chemicals. A key issue in the further development of chemical looping processes and its introduction to the industry is the selection and further development of an appropriate oxygen carrier (OC) material. This solid oxygen carrier material supplies the stoichiometric oxygen needed for the various chemical processes. Its reactivity, cost, toxicity, thermal stability, attrition resistance, and chemical stability are critical selection criteria for developing suitable oxygen carrier materials. To develop oxygen carriers with optimal properties and long-term stability, one must consider the employed reactor configuration and the aim of the chemical looping process, as well as the thermodynamic properties of the active phases, their interaction with the used support material, long-term stability, internal ionic migration, and the advantages and limits of the employed synthesis methods. This review, therefore, aims to give more understanding into all aforementioned aspects to facilitate further research and development of chemical looping technology.

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Chemical looping at the nanoscale — challenges and opportunities

Cited by 50 publications

References 62 publications

La_0.6Sr_0.4Cr_0.8Co_0.2O₃Perovskite Decorated with Exsolved Co Nanoparticles for Stable CO₂Splitting and Syngas Production

La_0.6Sr_0.4Cr_0.8Co_0.2O₃Perovskite Decorated with Exsolved Co Nanoparticles for Stable CO₂Splitting and Syngas Production

Effect of support on hydrogen generation over iron oxides in the chemical looping process

Development of Stable Oxygen Carrier Materials for Chemical Looping Processes—A Review

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Chemical looping at the nanoscale — challenges and opportunities

Cited by 50 publications

References 62 publications

La0.6Sr0.4Cr0.8Co0.2O3Perovskite Decorated with Exsolved Co Nanoparticles for Stable CO2Splitting and Syngas Production

La0.6Sr0.4Cr0.8Co0.2O3Perovskite Decorated with Exsolved Co Nanoparticles for Stable CO2Splitting and Syngas Production

Effect of support on hydrogen generation over iron oxides in the chemical looping process

Development of Stable Oxygen Carrier Materials for Chemical Looping Processes—A Review

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La_0.6Sr_0.4Cr_0.8Co_0.2O₃Perovskite Decorated with Exsolved Co Nanoparticles for Stable CO₂Splitting and Syngas Production

La_0.6Sr_0.4Cr_0.8Co_0.2O₃Perovskite Decorated with Exsolved Co Nanoparticles for Stable CO₂Splitting and Syngas Production