Effects of Potassium and Manganese Promoters on Nitrogen-Doped Carbon Nanotube-Supported Iron Catalysts for CO2 Hydrogenation

Kangvansura, Praewpilin; Chew, Ly May; Kongmark, Chanapa; Santawaja, Phatchada; Ruland, Holger; Xia, Wei; Schulz, Hans; Worayingyong, Attera; Mühler, Martin

doi:10.1016/j.eng.2017.03.013

Cited by 46 publications

(25 citation statements)

References 42 publications

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“…A broad peak with a maximum at 695 °C refers to the reduction of iron oxides to metallic iron, and the shoulder at 610 °C indicates that this process partially passes through the formation of a metastable wustite phase [ 50 ]. This can facilitate the easier reduction of iron to the metallic state Fe 0 [ 51 ], and the formation of this iron is a prerequisite for the formation of Hegg carbides—that is, active centers for the formation and growth of a chain of hydrocarbons [ 19 ]. The peak with a maximum at about 515 °C can be attributed to the reduction of zinc oxide to the metallic state ZnO→Zn 0 .…”

Section: Resultsmentioning

confidence: 99%

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Zn Doping Effect on the Performance of Fe-Based Catalysts for the Hydrogenation of CO2 to Light Hydrocarbons

et al. 2022

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In this work, we studied the role of zinc in the composition of supported iron-containing catalysts for the hydrogenation of CO2. Various variants of incipient wetness impregnation of the support were tested to obtain catalyst samples. The best results are shown for samples synthesized by co-impregnation of the support with a common solution of iron and zinc precursors at the same molar ratio of iron and zinc. Catalyst samples were analyzed by various methods: Raman, DRIFT-CO, TPR-H2, XPS, and UV/Vis. The introduction of zinc leads to the formation of a mixed ZnFe2O4 phase. In this case, the activation of the catalyst proceeds through the stage of formation of the metastable wustite phase FeO. The formation of this wustite phase promotes the formation of metallic iron in the composition of the catalyst under the reaction conditions. It is believed that the presence of metallic iron is a necessary step in the formation of iron carbides—that is, active centers for the formation and growth of chain in the hydrocarbons. This leads to an increase in the activity and selectivity of the formation of hydrocarbons in the process of CO2 hydrogenation.

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Section: Resultsmentioning

confidence: 99%

“…Zinc directs the process of iron reduction to the stage of FeO formation. Possibly, the stabilization of the FeO phase is achieved by the migration of Zn 2+ ions to the structure of iron [ 51 ]. Table 3 shows the specific absorption of hydrogen by the carrier and catalyst samples in the course of TPR-H 2 studies.…”

Section: Resultsmentioning

confidence: 99%

Zn Doping Effect on the Performance of Fe-Based Catalysts for the Hydrogenation of CO2 to Light Hydrocarbons

et al. 2022

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“…There are many recent works on the use of carbon nanotubes [114][115][116][117][118][119][120][121], graphitized carbon [113], honeycomb-structured graphene [122] and N-ordered mesoporous carbon [123,124] to support iron-based catalysts. Nitrogen doping of the carbon support is a common practice because it promotes the reduction in the supported iron oxide particles [114][115][116][117][118][119][120][121]. For example, the effectiveness of functionalization of multi-walled carbon nanotubes (MWCNTs) by oxygen and nitrogen in CO 2 hydrogenation was investigated by Chew et al [114].…”

Section: Carbon-based Catalystsmentioning

confidence: 99%

Catalysts for the Conversion of CO2 to Low Molecular Weight Olefins—A Review

et al. 2021

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There is a large worldwide demand for light olefins (C2=–C4=), which are needed for the production of high value-added chemicals and plastics. Light olefins can be produced by petroleum processing, direct/indirect conversion of synthesis gas (CO + H2) and hydrogenation of CO2. Among these methods, catalytic hydrogenation of CO2 is the most recently studied because it could contribute to alleviating CO2 emissions into the atmosphere. However, due to thermodynamic reasons, the design of catalysts for the selective production of light olefins from CO2 presents different challenges. In this regard, the recent progress in the synthesis of nanomaterials with well-controlled morphologies and active phase dispersion has opened new perspectives for the production of light olefins. In this review, recent advances in catalyst design are presented, with emphasis on catalysts operating through the modified Fischer–Tropsch pathway. The advantages and disadvantages of olefin production from CO2 via CO or methanol-mediated reaction routes were analyzed, as well as the prospects for the design of a single catalyst for direct olefin production. Conclusions were drawn on the prospect of a new catalyst design for the production of light olefins from CO2.

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“…Besides, potassium could promote the carbonization of iron species, which was one of the key factors for the low methane selectivity and high chain‐growth probability in CO x hydrogenation reaction. [ 39,40 ]…”

Section: Introductionmentioning

confidence: 99%

CO₂ hydrogenation to C₅₊ hydrocarbons over K‐promoted Fe/CNT catalyst: Effect of potassium on structure–activity relationship

Dai

Chen

Liu

et al. 2021

Applied Organom Chemis

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Developing efficient catalysts for direct CO2 hydrogenation to fuel hydrocarbons is of great significance for the effective utilization of CO2, and C5+ selectivity is one critical indicator for the process economics. In this work, a series of K‐promoted Fe/CNT catalysts were prepared by the co‐impregnation method, and their catalytic performance for CO2 hydrogenation was studied in a slurry‐bed reactor. As a result, CO2 conversion and C5+ selectivity showed positive correlation with the increase of K/Fe ratio from 0 to 0.3, but further increase of K/Fe ratio above 0.3 slightly affected its. The catalyst with a K/Fe molar ratio of 0.3 achieved the best performance with CO2 conversion of 23.7% and C5+ selectivity of 56%. In addition, the structure–activity relationship of the catalyst was discussed based on various characterization results. K‐modified catalysts presented a higher specific surface area and stronger CO2 chemisorption, which helped to improve CO2 conversion and C5+ selectivity. However, excessive potassium loading caused a loss of specific surface area, reduction degree, and graphitization degree of the catalyst, which inhibited the CO2 chemisorption and the formation of C5+ hydrocarbons.

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Effects of Potassium and Manganese Promoters on Nitrogen-Doped Carbon Nanotube-Supported Iron Catalysts for CO2 Hydrogenation

Cited by 46 publications

References 42 publications

Zn Doping Effect on the Performance of Fe-Based Catalysts for the Hydrogenation of CO2 to Light Hydrocarbons

Zn Doping Effect on the Performance of Fe-Based Catalysts for the Hydrogenation of CO2 to Light Hydrocarbons

Catalysts for the Conversion of CO2 to Low Molecular Weight Olefins—A Review

CO₂ hydrogenation to C₅₊ hydrocarbons over K‐promoted Fe/CNT catalyst: Effect of potassium on structure–activity relationship

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Effects of Potassium and Manganese Promoters on Nitrogen-Doped Carbon Nanotube-Supported Iron Catalysts for CO2 Hydrogenation

Cited by 46 publications

References 42 publications

Zn Doping Effect on the Performance of Fe-Based Catalysts for the Hydrogenation of CO2 to Light Hydrocarbons

Zn Doping Effect on the Performance of Fe-Based Catalysts for the Hydrogenation of CO2 to Light Hydrocarbons

Catalysts for the Conversion of CO2 to Low Molecular Weight Olefins—A Review

CO2 hydrogenation to C5+ hydrocarbons over K‐promoted Fe/CNT catalyst: Effect of potassium on structure–activity relationship

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CO₂ hydrogenation to C₅₊ hydrocarbons over K‐promoted Fe/CNT catalyst: Effect of potassium on structure–activity relationship