Methanation of CO2 on iron based catalysts

Kirchner, Johann; Anolleck, Jasmin Katharina; Lösch, Henry; Kureti, Sven

doi:10.1016/j.apcatb.2017.06.025

Cited by 108 publications

(81 citation statements)

References 73 publications

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“…Generally, substantial CH 4 yield is reported for elevated temperatures above 400 °C, pressures in the range of 15 bar and high molar H 2 /CO 2 ratios, e. g. Y(CH 4 )=34 % at 400 °C, 15 bar, molar H 2 /CO 2 ratio of 6 and 1.14 l/g/h, whereas the CH 4 selectivity is 50 % only . Furthermore, a recent study demonstrates a maximum CH 4 yield of 81 % (X(CO 2 )=85 %) using a bare α‐Fe 2 O 3 pre‐exposed to H 2 . Note that CO significantly appears as side product, while C 2 −C 3 hydrocarbons are formed in minor abundance only; corresponding methanation conditions are referred to a stoichiometric H 2 /CO 2 ratio, 400 °C, 15 bar and 8.3 l/g/h.…”

Section: Co2 Methanation Activity Of Fe Catalystsmentioning

confidence: 99%

“…Additionally, these carbidic structures are hardly stable under atmospheric conditions, thus requiring in situ XRD analyses. These measurements can be conducted at relevant temperatures as well as elevated pressures . Indeed, distinct phase assignment of ϵ‐carbides (ϵ‐Fe 2 C and ϵ’‐Fe 2.2 C) is focused in several studies.…”

Section: Characterization Of Fe Catalysts Exposed To Syngasmentioning

confidence: 99%

“…When the TPH is stopped after the first CH 4 peak, XRD as well as 57 Fe Mössbauer spectroscopy both evidence exclusive presence of α‐Fe. Hence, the TPH peak ranging from 220 to 400 °C is clearly attributed to the complete hydrogenation of the iron carbides . As a consequence, the assignment of the CH 4 signals should be made by using accompanying characterization methods, since the TPH profiles also depend on the physical‐chemical properties of the Fe catalysts.…”

Section: Characterization Of Fe Catalysts Exposed To Syngasmentioning

confidence: 99%

“… TPH pattern of a γ‐Fe 2 O 3 catalyst after CO 2 hydrogenation for 18 h at 400 °C and 1 bar; TPH conditions: 200 ml min −1 H 2 , 5 K min −1 …”

Section: Characterization Of Fe Catalysts Exposed To Syngasmentioning

confidence: 99%

“…[12] Furthermore, a recent study demonstrates a maximum CH 4 yield of 81 % (X(CO 2 ) = 85 %) using a bare α-Fe 2 O 3 pre-exposed to H 2 . [25] Note that CO significantly appears as side product, while C 2 À C 3 hydrocarbons are formed in minor abundance only; corresponding methanation conditions are referred to a stoichiometric H 2 /CO 2 ratio, 400°C, 15 bar and 8.3 l/g/h. Additionally, Yoshida et al [26] showed CH 4 yields about 60 to 70 % on partially H 2 -reduced Fe 3 O 4 .…”

Section: Co 2 Methanation Activity Of Fe Catalystsmentioning

confidence: 99%

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Activity and Structural Changes of Fe‐based Catalysts during CO₂ Hydrogenation towards CH₄ – A Mini Review

2020

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Heterogeneous iron catalysts are active in the hydrogenation of carbon oxides and are widely investigated for the production of long‐chained hydrocarbons according to the Fischer‐Tropsch synthesis. Moreover, high selectivity of light hydrocarbons, such as CH4, also occurs strongly depending on reaction conditions and catalyst formulations. As a consequence, Fe catalysts reveal promising methanation activity as referred to the traditional Ni catalysts. Additionally, Fe catalysts also benefit from their low price and toxicological harmlessness. However, the dynamic behavior of iron upon CO2 hydrogenation is not yet unraveled unambiguously including phase transformations, structural changes and participation of carbon species formed. The present review highlights these complex processes of Fe catalysts with special focus on the methanation of CO2. Additionally, different analytical tools useful for ex situ and in situ studies are critically evaluated.

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Section: Co2 Methanation Activity Of Fe Catalystsmentioning

confidence: 99%

Section: Characterization Of Fe Catalysts Exposed To Syngasmentioning

confidence: 99%

Section: Characterization Of Fe Catalysts Exposed To Syngasmentioning

confidence: 99%

“… TPH pattern of a γ‐Fe 2 O 3 catalyst after CO 2 hydrogenation for 18 h at 400 °C and 1 bar; TPH conditions: 200 ml min −1 H 2 , 5 K min −1 …”

Section: Characterization Of Fe Catalysts Exposed To Syngasmentioning

confidence: 99%

Section: Co 2 Methanation Activity Of Fe Catalystsmentioning

confidence: 99%

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Activity and Structural Changes of Fe‐based Catalysts during CO₂ Hydrogenation towards CH₄ – A Mini Review

2020

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Plasma‐driven CO₂ hydrogenation to CH₃OH over Fe₂O₃/γ‐Al₂O₃ catalyst

Meng

Liu

et al. 2023

AIChE Journal

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We report a plasma‐assisted CO2 hydrogenation to CH3OH over Fe2O3/γ‐Al2O3 catalysts, achieving 12% CO2 conversion and 58% CH3OH selectivity at a temperature of nearly 80°C atm pressure. We investigated the effect of various supports and loadings of the Fe‐based catalysts, as well as optimized reaction conditions. We characterized catalysts by X‐ray powder diffraction (XRD), hydrogen temperature programmed reduction (H2‐TPR), CO2 and CO temperature programmed desorption (CO2/CO‐TPD), high‐resolution transmission electron microscopy (HRTEM), scanning transmission electron microscopy (STEM), x‐ray photoelectron spectroscopy (XPS), Mössbauer, and Fourier transform infrared (FTIR). The XPS results show that the enhanced CO2 conversion and CH3OH selectivity are attributed to the chemisorbed oxygen species on Fe2O3/γ‐Al2O3. Furthermore, the diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs) and TPD results illustrate that the catalysts with stronger CO2 adsorption capacity exhibit a higher reaction performance. In situ DRIFTS gain insight into the specific reaction pathways in the CO2/H2 plasma. This study reveals the role of chemisorbed oxygen species as a key intermediate, and inspires to design highly efficient catalysts and expand the catalytic systems for CO2 hydrogenation to CH3OH.

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Unravelling the New Roles of Na and Mn Promoter in CO₂ Hydrogenation over Fe₃O₄‐Based Catalysts for Enhanced Selectivity to Light α‐Olefins

et al. 2018

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The direct production of light α‐olefins (C2=‐C4=) from CO2 is of great importance as this process can convert the greenhouse gas into the desired chemicals. In this study, the crucial roles of Na and Mn promoter in CO2 hydrogenation to produce light α‐olefins via the Fischer‐Tropsch synthesis (FTS) over Fe3O4‐based catalysts are investigated. The results indicate that both Na and Mn promoter can enhance the reducibility of Fe3O4. In situ XPS and DFT calculations show that Na facilitates the reduction by electron donation from Na to Fe as the oxygen vacancy formation energy is reduced by Na. In contrast, Mn promotes the reduction by the presence of oxygen vacancy in MnO as the oxygen in Fe oxide can spillover to the vacancy in MnO spontaneously. For un‐promoted Fe3O4 catalysts, CO2 hydrogenation dominantly produces light n‐paraffins. The addition of Na remarkably shifts the selectivity to light α‐olefins with a sharp decline in the selectivity to light n‐paraffins, which is attributed to the electron donation from Na to Fe resulting in the promoted CO dissociation and the favorable β‐H abstraction of surface short alkyl‐metal intermediates. The addition of Mn into Na‐containing Fe3O4 catalysts can obviously further enhance the selectivity to light α‐olefins as the spatial hindrance of Mn suppresses the chain growth to increase the amount of surface short alkyl‐metal intermediates.

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Methanation of CO2 on iron based catalysts

Cited by 108 publications

References 73 publications

Activity and Structural Changes of Fe‐based Catalysts during CO₂ Hydrogenation towards CH₄ – A Mini Review

Activity and Structural Changes of Fe‐based Catalysts during CO₂ Hydrogenation towards CH₄ – A Mini Review

Plasma‐driven CO₂ hydrogenation to CH₃OH over Fe₂O₃/γ‐Al₂O₃ catalyst

Unravelling the New Roles of Na and Mn Promoter in CO₂ Hydrogenation over Fe₃O₄‐Based Catalysts for Enhanced Selectivity to Light α‐Olefins

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Methanation of CO2 on iron based catalysts

Cited by 108 publications

References 73 publications

Activity and Structural Changes of Fe‐based Catalysts during CO2 Hydrogenation towards CH4 – A Mini Review

Activity and Structural Changes of Fe‐based Catalysts during CO2 Hydrogenation towards CH4 – A Mini Review

Plasma‐driven CO2 hydrogenation to CH3OH over Fe2O3/γ‐Al2O3 catalyst

Unravelling the New Roles of Na and Mn Promoter in CO2 Hydrogenation over Fe3O4‐Based Catalysts for Enhanced Selectivity to Light α‐Olefins

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Product

Resources

About

Activity and Structural Changes of Fe‐based Catalysts during CO₂ Hydrogenation towards CH₄ – A Mini Review

Activity and Structural Changes of Fe‐based Catalysts during CO₂ Hydrogenation towards CH₄ – A Mini Review

Plasma‐driven CO₂ hydrogenation to CH₃OH over Fe₂O₃/γ‐Al₂O₃ catalyst

Unravelling the New Roles of Na and Mn Promoter in CO₂ Hydrogenation over Fe₃O₄‐Based Catalysts for Enhanced Selectivity to Light α‐Olefins