Low-temperature Conversion of Carbon Dioxide to Methane in an Electric Field

Yamada, Kensei; Ogo, Shuhei; Yamano, Ryota; Higo, Takuma; Sekine, Yasushi

doi:10.1246/cl.190930

Cited by 28 publications

(16 citation statements)

References 32 publications

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“…During the CO 2 reduction reaction (CO 2 RR), multiple viable products are generated depending on the reaction kinetics and electron transport process. Among the C 1 feedstocks of CO 2 RR, CH 4 is the cleanest‐burning fossil fuel that can be directly used in fuel cells and as a hydrogen carrier [8, 9] . However, because CH 4 production is an eight‐electron reduction process in which the charge transport kinetics plays an important role, achieving high efficiency and selectivity remains a challenge that relies heavily on the development of new photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Boosted Inner Surface Charge Transfer in Perovskite Nanodots@Mesoporous Titania Frameworks for Efficient and Selective Photocatalytic CO₂ Reduction to Methane

et al. 2022

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Exploring high-efficiency and stable halide perovskite-based photocatalysts for the selective reduction of CO 2 to methane is a challenge because of the intrinsic photo-and chemical instability of halide perovskites. In this study, halide perovskites (Cs 3 Bi 2 Br 9 and Cs 2 AgBiBr 6 ) were grown in situ in mesoporous TiO 2 frameworks for an efficient CO 2 reduction. Benchmarked CH 4 production rates of 32.9 and 24.2 μmol g À 1 h À 1 with selectivities of 88.7 % and 84.2 %, were achieved, respectively, which are better than most reported halide perovskite photocatalysts. Focused ionbeam sliced-imaging techniques were used to directly image the hyperdispersed perovskite nanodots confined in mesopores with tunable sizes ranging from 3.8 to 9.9 nm. In situ X-ray photoelectronic spectroscopy and Kelvin probe force microscopy showed that the built-in electric field between the perovskite nanodots and mesoporous titania channels efficiently promoted photoinduced charge transfer. Density functional theory calculations indicate that the high methane selectivity was attributed to the Bi-adsorption-mediated hydrogenation of *CO to *HCO that dominates CO desorption.

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Section: Introductionmentioning

confidence: 99%

Boosted Inner Surface Charge Transfer in Perovskite Nanodots@Mesoporous Titania Frameworks for Efficient and Selective Photocatalytic CO₂ Reduction to Methane

et al. 2022

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“…Chromium and ruthenium (Ru) can act as key metal catalysts for CH 4 production via Sabatier reaction (Etiope & Ionescu, 2015;Etiope et al, 2018). It is also well-known that supported Ru catalysts promote CO 2 methanation (e.g., Yamada et al, 2020). Hydrothermally synthesized Ru nanoparticles also promote the conversion of CO 2 to CH 4 (Cored et al, 2019).…”

Section: Candidates Of Catalysts In Chromititementioning

confidence: 99%

Abiotic Methane Generation via CO₂ Hydrogenation With Natural Chromitite Under Hydrothermal Conditions

Ueda

Matsui

Sawaki

2021

Geochem Geophys Geosyst

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In modern continental serpentinization systems and ultramafic rock‐hosted sub‐seafloor hydrothermal systems, it is believed that chromitite plays an important role in abiotic hydrocarbon generation. Previous experiments have suggested that chromite acts as a catalyst of CH4 generation, but the composition of chromite used in the previous experiment is unrealistic on Earth. On the other hand, other studies have suggested that natural chromite including Mg and Al cannot function as a catalyst for CH4 generation. Consequently, it still remains uncertain whether naturally occurring Cr‐rich minerals promote CH4 generation. We monitored the reaction between naturally occurring chromitite and CO2‐rich fluid at 300°C, 500 bars. We performed two experiments in different initial CO2/H2 ratios. In both experiments, CH4 was generated immediately after the beginning of experiments. When CO2 was more abundant than H2, the CH4 concentration in the fluid decreased below the detection limit value. On the other hand, when H2 was more abundant than CO2, the CH4 concentration in the fluid was maintained above 0.01 mmol/kg. This is the first report to demonstrate that naturally occurring Cr‐rich minerals act as a promotor of CH4 generation. Cr‐rich minerals such as Cr spinel are common accessory mineral in ultramafic rock. Therefore, on the early Earth, a certain level (on the order of 0.01 mmol/kg) of CH4 was likely produced through reactions between ultramafic rock and CO2‐bearing fluid. To produce more abundant CH4, more favorable conditions featuring greater quantities of Cr spinel and much higher H2 concentration (H2/CO2 ratio) must be necessary.

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“…[22][23][24][25] We earlier reported various effects of enhanced activity and lowered apparent activation energy at low temperatures in DRM, 26 RWGS, 27 and CO 2 methanation. 28 However, details of the reactivity of CO 2 and its adsorption ability in the EF have not been claried. Therefore, in situ DRIFTs measurements were taken for this study to conrm EF effects on the CO 2 conversion reaction by examining changes of intermediates when the EF is applied during a DRM reaction.…”

Section: Introductionmentioning

confidence: 99%

Elucidation of the reaction mechanism on dry reforming of methane in an electric field by in situ DRIFTs

et al. 2022

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Low-temperature Conversion of Carbon Dioxide to Methane in an Electric Field

Cited by 28 publications

References 32 publications

Boosted Inner Surface Charge Transfer in Perovskite Nanodots@Mesoporous Titania Frameworks for Efficient and Selective Photocatalytic CO₂ Reduction to Methane

Boosted Inner Surface Charge Transfer in Perovskite Nanodots@Mesoporous Titania Frameworks for Efficient and Selective Photocatalytic CO₂ Reduction to Methane

Abiotic Methane Generation via CO₂ Hydrogenation With Natural Chromitite Under Hydrothermal Conditions

Elucidation of the reaction mechanism on dry reforming of methane in an electric field by in situ DRIFTs

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Low-temperature Conversion of Carbon Dioxide to Methane in an Electric Field

Cited by 28 publications

References 32 publications

Boosted Inner Surface Charge Transfer in Perovskite Nanodots@Mesoporous Titania Frameworks for Efficient and Selective Photocatalytic CO2 Reduction to Methane

Boosted Inner Surface Charge Transfer in Perovskite Nanodots@Mesoporous Titania Frameworks for Efficient and Selective Photocatalytic CO2 Reduction to Methane

Abiotic Methane Generation via CO2 Hydrogenation With Natural Chromitite Under Hydrothermal Conditions

Elucidation of the reaction mechanism on dry reforming of methane in an electric field by in situ DRIFTs

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Boosted Inner Surface Charge Transfer in Perovskite Nanodots@Mesoporous Titania Frameworks for Efficient and Selective Photocatalytic CO₂ Reduction to Methane

Boosted Inner Surface Charge Transfer in Perovskite Nanodots@Mesoporous Titania Frameworks for Efficient and Selective Photocatalytic CO₂ Reduction to Methane

Abiotic Methane Generation via CO₂ Hydrogenation With Natural Chromitite Under Hydrothermal Conditions