Impact of lattice properties on the CO2 splitting kinetics of lanthanide-doped cerium oxides for chemical looping syngas production

Laqdiem, Marwan; Carrillo, Alfonso J.; Dimitrakopoulos, Georgios; Balaguer, María; García‐Fayos, Julio; Ghoniem, Ahmed F.; Serrà, Joan

doi:10.1016/j.ssi.2023.116192

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…For instance, doping ceria with trivalent cations such as gadolinium increases its ionic conductivity. 124,125 These materials are employed in a wide range of high-temperature processes in which surface reactions are crucial. Thus, functionalization with robust exsolved nanoparticles would be highly convenient.…”

Section: Exsolution From Non-perovskite Oxidesmentioning

confidence: 99%

New trends in nanoparticle exsolution

Carrillo,

López-García,

Delgado-Galicia

et al. 2024

Chem. Commun.

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Section: Exsolution From Non-perovskite Oxidesmentioning

confidence: 99%

New trends in nanoparticle exsolution

Carrillo,

López-García,

Delgado-Galicia

et al. 2024

Chem. Commun.

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“…The introduction of dopant, supports, and the use of mixed oxides can considerably increase oxygen carriers' performance [56][57][58]. Alumina is a common, cheap support material, and its interaction with cerium dioxide has been studied in a number of applications.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Process Conditions for H2 Production by Chemical Looping Reforming

Storione,

Boscherini,

Miccio

et al. 2024

Energies

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A syngas production process was studied cyclically, exploiting the redox properties of Ce-based oxygen carriers. The two steps of the looping cycle were investigated through thermogravimetric analysis and fixed bed experiments. While TGA experiments were focused on the identification of the optimal temperatures ranges for methane partial oxidation (900–1000 °C) and carrier regeneration (400–900 °C), fixed bed testing was performed isothermally (at 900 or 950 °C), with a 10% CH4 feed stream in N2 to investigate material stability and cyclic performance reproducibility. The effect of the process times on carbon deposition, specific syngas yields, and selectivity was inspected, together with the investigation of best conditions to fully regenerate the carrier, adjust the syngas final ratio, and to ensure stable performances. The obtained results ensured the possibility to work in fully isothermal operations, with CH4 conversion of up to 38% and specific yields of syngas per mass of O2 carrier between 4.0–6.8 mmol∙g−1, preserved even across cycles, thus paving the path to the development of alternative and effective processes for syngas production. Under the operating conditions of the lab-scale experiment, an effective reforming time was 20 min, corresponding to 1.16 times of the characteristic time of reaction kinetics at 950 °C.

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Enhanced Hydrogen Production in Microwave‐Driven Water‐Splitting Redox Cycles by Engineering Ceria Properties

Domínguez‐Saldaña,

Navarrete,

Balaguer

et al. 2024

Advanced Energy Materials

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Sustainable hydrogen, produced from renewable sources such as solar or wind, plays a decisive role in driving industrial decarbonization. Among hydrogen production technologies, steam electrolysis, and solar‐driven thermochemical cycles using reducible solid oxides show promise but face challenges due to high operation temperatures. Microwave‐driven redox chemical looping enables the direct, contactless electrification of the process, reducing the operation temperature and complexity. Previous works showed that microwaves can efficiently drive reduction/water‐splitting cycles using Gd‐doped ceria at low temperatures (<250 °C), but adjustment of material properties is needed. Here, the key properties of materials are explored that affect the redox mechanism by screening a series of doped ceria materials to enhance microwave‐driven hydrogen production. Evaluation of trivalent dopants (La3+, Gd3+, Y3+, Yb3+, Er3+, and Nd3+) reveals that reduction correlates with lattice and electronic properties. The composition Ce0.9La0.1O2‐δ achieves 1.41 mL g−1, the highest hydrogen production among the studied series. Its narrower bandgap allows for reaching higher conductivity upon microwave‐driven reduction at lower temperatures, while a larger ionic lattice size boosts solid‐state oxygen diffusion. Overall, this research remarks on the critical properties of ceria‐based materials that enhance hydrogen production in microwave‐driven water‐splitting cycles, supporting the design of more efficient materials for sustainable chemical production technology.

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Impact of lattice properties on the CO2 splitting kinetics of lanthanide-doped cerium oxides for chemical looping syngas production

Cited by 5 publications

References 34 publications

New trends in nanoparticle exsolution

New trends in nanoparticle exsolution

Improvement of Process Conditions for H2 Production by Chemical Looping Reforming

Enhanced Hydrogen Production in Microwave‐Driven Water‐Splitting Redox Cycles by Engineering Ceria Properties

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