Proton conduction-assisted direct CO2 methanation using Ni/CaO/Y-doped BaZrO3 proton conductor

Lee, Jihan; Otomo, Junichiro

doi:10.1016/j.fuel.2022.124094

Cited by 3 publications

(2 citation statements)

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“…In our previous study, to achieve direct flue gas (10% CO 2 and 5% H 2 O) CO 2 methanation, direct CO 2 methanation was conducted with dual-functional materials (DFMs), Ni and CaO supported on BaZr 0.9 Y 0.1 O 3 (BZY10) at 420 °C. 25 The study suggested that proton conduction can facilitate the adsorption of CO 2 on CaO to form COOH at low temperatures, as evidenced by the infrared (IR) spectra, resulting in facile direct CO 2 methanation. 25 In this study, K-β alumina was employed to faciliate the ionic conduction effect for an accelerated direct air capture methanation.…”

Section: ■ Introductionmentioning

confidence: 99%

“…25 The study suggested that proton conduction can facilitate the adsorption of CO 2 on CaO to form COOH at low temperatures, as evidenced by the infrared (IR) spectra, resulting in facile direct CO 2 methanation. 25 In this study, K-β alumina was employed to faciliate the ionic conduction effect for an accelerated direct air capture methanation. CO 2 was captured from 400 ppm CO 2 and 1.8% H 2 O simulated gas with K 2 CO 3 solid sorbent at room temperature (30 °C) and transformed into CH 4 at elevated temperatures (30−300 °C) in a H 2 atmosphere, as displayed in eqs 1 and 2.…”

Section: ■ Introductionmentioning

confidence: 99%

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Low-Temperature Activated Direct Air Capture Methanation Using K-β″ Alumina

Lee

Otomo

2023

Ind. Eng. Chem. Res.

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400 ppm of CO 2 was captured with Ru/K 2 CO 3 on K-β″ alumina at 30 °C and was transformed into CH 4 successfully when the temperature was increased to 300 °C. K-β″ alumina was employed as the support material, and K + ions were designed to access Ru particles and induce the activation of adsorbed CO 2 . By the promotional effect, the K-β″ alumina-supported catalyst displayed a lower methanation temperature (120 °C) than the γ-Al 2 O 3 -supported one (150 °C). The K-β″ alumina-supported catalysts also exhibited high CH 4 selectivity (79%) and highly stable cyclic properties throughout the tests. Diffuse reflectance infrared Fourier transform spectroscopy revealed that K + in K-β″ alumina actively intervenes in the formation of intermediates (CO 3 2− and CO). The promotion in reactions will be due to σ → π K backdonation and can assist in their reactions to other intermediates (formate and carbonyl) at 120 °C. This implies that promotion of CH 4 intermediates' formation was aided by the conduction of K + in K-β″ alumina.

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Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%