Co-precipitated Fe-Zr catalysts for the Fischer-Tropsch synthesis of lower olefins (C2O ∼ C4O): Synergistic effects of Fe and Zr

Ma, Zixuan; Zhou, Chenliang; Wang, Danmei; Wang, Yaxiong; He, Wenxiu; Tan, Yisheng; Liu, Quansheng

doi:10.1016/j.jcat.2019.08.037

Cited by 26 publications

(20 citation statements)

References 55 publications

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“…With varying the catalyst material compositions (e. g., active d-block metal, support material and structural and/or chemical promoters) the catalysts behaviour can be modified. [1,7,16,17,[8][9][10][11][12][13][14][15] General requirements for an industrially good FTS reaction catalyst material are: i) sufficient activity towards FTS reaction, ii) high selectivity for converting the input CO only to the desired hydrocarbons and iii) mechanical and catalytical stability. [4] Despite most of the d-block transition metals being somewhat active towards the FTS reaction, [1,18,19] catalysts based on Fe and Co are the most suitable ones for FTS reaction applications.…”

Section: Introductionmentioning

confidence: 99%

Carbon Pathways, Sodium‐Sulphur Promotion and Identification of Iron Carbides in Iron‐based Fischer‐Tropsch Synthesis

Paalanen

Weckhuysen

2020

ChemCatChem

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Fisher‐Tropsch Synthesis (FTS) is industrially used for converting a carbon‐containing feedstock, such as coal, natural gas, biomass, and municipal waste, via the production of synthesis gas (a mixture of CO+H2) into hydrocarbons. This review article focuses on Fe‐based FTS catalysis, thereby focusing on the process conditions available for steering the various carbon pathways from input CO and their associated reactions. We will also discuss the effects of alkali‐sulphur chemical promotion and the identification of the FTS reaction active Fe carbides, which are assigned with precise crystal structures and nomenclature. Each observed Fe carbide crystal structure is further assigned with corresponding Mössbauer Absorption Spectroscopy (MAS) hyperfine fields. The expected formation temperatures and experimental conditions for the identified Fe carbides encountered in FTS research, namely ϵ‐Fe3C, η‐Fe2C, χ‐Fe5C2, θ‐Fe3C and θ‐Fe7C3, are reviewed.

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Section: Introductionmentioning

confidence: 99%

Carbon Pathways, Sodium‐Sulphur Promotion and Identification of Iron Carbides in Iron‐based Fischer‐Tropsch Synthesis

Paalanen

Weckhuysen

2020

ChemCatChem

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“…The second peak at about 400 °C is assigned to the iron carbides (χ-Fe 5 C 2 , θ-Fe 3 C, etc.) from the reduction of Fe 3 O 4 by CO. , The third peak at about 521 °C indicates the carburization producing more carbon deposition on the catalyst . The corresponding peaks (294, 359, and 508 °C) for the 15Fe–K/t-ZrO 2 catalyst shift to a lower temperature than those with the 15Fe–K/m-ZrO 2 catalyst, indicating that the carburization temperature on the t-ZrO 2 support is lower than that on the m-ZrO 2 support.…”

Section: Resultsmentioning

confidence: 98%

“…from the reduction of Fe 3 O 4 by CO. 55,56 The third peak at about 521 °C indicates the carburization producing more carbon deposition on the catalyst. 57 The corresponding peaks (294, 359, and 508 °C) for the 15Fe−K/t-ZrO 2 catalyst shift to a lower temperature than those with the 15Fe−K/m-ZrO 2 catalyst, indicating that the carburization temperature on the t-ZrO 2 support is lower than that on the m-ZrO 2 support. In other words, the CO-TPR peaks on the 15Fe−K/t-ZrO 2 catalyst shifted to a lower temperature in comparison to those on the 15Fe−K/m-ZrO 2 catalyst due to the weaker interaction between the FeO x species and the support.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Dynamic Evolution of Fe and Carbon Species over Different ZrO₂ Supports during CO Prereduction and Their Effects on CO₂ Hydrogenation to Light Olefins

Huang

Jiang

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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The dynamic evolution of active Fe species and carbon species during CO prereduction was revealed for Fe–Zr catalysts with different (monoclinic and tetragonal) zirconia supports (m-ZrO2 and t-ZrO2) on CO2 hydrogenation to light olefins. As the Fe loading reached 15 wt %, the corresponding Fe–K/m-ZrO2 catalyst presented a remarkable CO2 conversion (38.8%) and a high selectivity to light olefins in the hydrocarbon (C–H) products (42.8%). Using in situ characterization techniques including in situ X-ray diffraction (XRD), Raman, and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), the dynamic evolution (reduction and carburization) of iron oxides and the generation of diverse carbon species during CO prereduction on different ZrO2 supports were probed. The detected intermediate FeO species in the Fe–K/m-ZrO2 catalyst indicates a mild and sufficient reduction of Fe2O3 on m-ZrO2, promoting the carburization leading to smaller and more active iron species (Fe3O4 and χ-Fe5C2). More oxygen vacancies (Ov) on the surface of m-ZrO2 and the electron-donating ability of iron elements boosted the charge transfer between Fe and the ZrO2 support, forming a more active Fe species. For the Fe–K/t-ZrO2 catalyst, the low selectivity of C x H y implied its weak capacity to produce light olefins through CO2 hydrogenation. By comparison, the m-ZrO2 support provided relatively more strong basic sites, reducing the physically deposited carbon species and coke generation. The formation of more χ-Fe5C2 species contributed to the high yield of light olefins in products. Tuning the physicochemical properties and base microenvironment of supports could be an effective means to boost the iron catalyst activity for CO2 hydrogenation to olefins.

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“…The syngas, which mainly consist of CO and hydrogen, has great potential to produce many useful platform chemicals [ 1 , 2 , 3 , 4 ]. It is well known that CO/H 2 can be converted to methanol using a Cu-based catalyst under pressured conditions and can produce gasoline by the Fischer–Tropsch process using iron-based catalysts [ 5 , 6 , 7 , 8 ]. However, CO plays a role as an anthropogenic toxic pollutant when it is released at levels beyond the those established by environmental regulations.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Crystalline Properties of Hollow Ceria Nanostructures on a CuO-CeO2 Catalyst in CO Oxidation

et al. 2022

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The development of an efficient and economic catalyst with high catalytic performance is always challenging. In this study, we report the synthesis of hollow CeO2 nanostructures and the crystallinity control of a CeO2 layer used as a support material for a CuO-CeO2 catalyst in CO oxidation. The hollow CeO2 nanostructures were synthesized using a simple hydrothermal method. The crystallinity of the hollow CeO2 shell layer was controlled through thermal treatment at various temperatures. The crystallinity of hollow CeO2 was enhanced by increasing the calcination temperature, but both porosity and surface area decreased, showing an opposite trend to that of crystallinity. The crystallinity of hollow CeO2 significantly influenced both the characteristics and the catalytic performance of the corresponding hollow CuO-CeO2 (H-Cu-CeO2) catalysts. The degree of oxygen vacancy significantly decreased with the calcination temperature. H-Cu-CeO2 (HT), which presented the lowest CeO2 crystallinity, not only had a high degree of oxygen vacancy but also showed well-dispersed CuO species, while H-Cu-CeO2 (800), with well-developed crystallinity, showed low CuO dispersion. The H-Cu-CeO2 (HT) catalyst exhibited significantly enhanced catalytic activity and stability. In this study, we systemically analyzed the characteristics and catalyst performance of hollow CeO2 samples and the corresponding hollow CuO-CeO2 catalysts.

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Co-precipitated Fe-Zr catalysts for the Fischer-Tropsch synthesis of lower olefins (C2O ∼ C4O): Synergistic effects of Fe and Zr

Cited by 26 publications

References 55 publications

Carbon Pathways, Sodium‐Sulphur Promotion and Identification of Iron Carbides in Iron‐based Fischer‐Tropsch Synthesis

Carbon Pathways, Sodium‐Sulphur Promotion and Identification of Iron Carbides in Iron‐based Fischer‐Tropsch Synthesis

Dynamic Evolution of Fe and Carbon Species over Different ZrO₂ Supports during CO Prereduction and Their Effects on CO₂ Hydrogenation to Light Olefins

Effects of the Crystalline Properties of Hollow Ceria Nanostructures on a CuO-CeO2 Catalyst in CO Oxidation

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Co-precipitated Fe-Zr catalysts for the Fischer-Tropsch synthesis of lower olefins (C2O ∼ C4O): Synergistic effects of Fe and Zr

Cited by 26 publications

References 55 publications

Carbon Pathways, Sodium‐Sulphur Promotion and Identification of Iron Carbides in Iron‐based Fischer‐Tropsch Synthesis

Carbon Pathways, Sodium‐Sulphur Promotion and Identification of Iron Carbides in Iron‐based Fischer‐Tropsch Synthesis

Dynamic Evolution of Fe and Carbon Species over Different ZrO2 Supports during CO Prereduction and Their Effects on CO2 Hydrogenation to Light Olefins

Effects of the Crystalline Properties of Hollow Ceria Nanostructures on a CuO-CeO2 Catalyst in CO Oxidation

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Resources

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Co-precipitated Fe-Zr catalysts for the Fischer-Tropsch synthesis of lower olefins (C2O ∼ C4O): Synergistic effects of Fe and Zr

Dynamic Evolution of Fe and Carbon Species over Different ZrO₂ Supports during CO Prereduction and Their Effects on CO₂ Hydrogenation to Light Olefins