On the structural, textural and morphological features of Fe-based catalysts supported on polystyrene mesoporous carbon for Fischer–Tropsch synthesis

Cruz, Márcia G.A.; Bastos‐Neto, Moises; Oliveira, Alcinéia C.; Filho, J. Mendes; Soares, J.M.; Rodríguez‐Castellón, Enrique; Fernandes, Fabiano A. N.

doi:10.1016/j.apcata.2015.02.009

Cited by 21 publications

(20 citation statements)

References 59 publications

(101 reference statements)

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“…Figure 1a show the main diffraction crystallographic planes at 2θ = 30.2 • , 35.4 • , 37.1 • , 43.4 • , 56.9 • and 62.5 • , which are attributed to be from the (220), (311), (400), (422), (511) and (440) planes, respectively. These peaks were indexed to a standard pattern of the inverse cubic spinel Fe 3 O 4 phase, e.g., magnetite with file JCPDS 85-1436, in agreement with some reports [22]. Hence, co-precipitating aqueous solutions of iron sulphate precursors, e.g., Fe 2+ /Fe 3+ ions mixtures in a basic medium with sucrose promotes the formation of iron hydroxides (Fe(OH) 3 ) and oxyhydroxides (α-FeOOH).…”

Section: Adsorption Studiessupporting

confidence: 87%

“…The O 1s core level spectra exhibit contributions at 530.0 and 531.5 eV. While the first contribution is assigned to lattice oxygen from iron oxides, the latter is due to surface hydroxyl groups and oxygen bonded to carbon [22]. These results confirm that the samples do not suffer from phase transformation and the α-Fe 2 O 3 , γ-Fe 2 O 3 and Fe 3 O 4 phases are preserved, after the adsorption process.…”

Section: Samplesupporting

confidence: 52%

“…In the case of Fe sample, the binding energies (BE) located at about 710.5-711.0 and 724.2 eV are ascribed to Fe 2p 3/2 and Fe 2p 1/2 , respectively. This indicates that Fe species exist as Fe 3+ and Fe 3+ coming from the γ-Fe 2 O 3 and Fe 3 O 4 besides that of α-Fe 2 O 3 phases [22]. Moreover, the shake satellite peak at 718.8 eV is associated with the γ-Fe 2 O 3 .…”

Section: Samplementioning

confidence: 90%

“…The Mössbauer spectroscopy studies are performed to obtain the chemical environments of the iron on the samples [22,35,36]. Mössbauer spectrum of Fe depicts the typical shape of Fe 3 O 4 with four sextets, e.g., S1, S2, S3 and S4 (Figure 5a).…”

Section: Mössbauer Epr and Magnetization Curvesmentioning

confidence: 99%

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Acid Red 66 Dye Removal from Aqueous Solution by Fe/C-based Composites: Adsorption, Kinetics and Thermodynamic Studies

et al. 2020

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The presence of synthetic dyes in water causes serious environmental issues owing to the low water quality, toxicity to environment and human carcinogenic effects. Adsorption has emerged as simple and environmental benign processes for wastewater treatment. This work reports the use of porous Fe-based composites as adsorbents for Acid Red 66 dye removal in an aqueous solution. The porous FeC and Fe/FeC solids were prepared by hydrothermal methods using iron sulfates and sucrose as precursors. The physicochemical properties of the solids were evaluated through X-ray diffraction (XRD), Scanning electron microscopy coupled with Energy dispersive spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared s (FTIR), Raman and Mössbauer spectroscopies, nitrogen adsorption–desorption isotherms, Electron Paramagnetic Resonance (EPR) and magnetic saturation techniques. Results indicated that the Fe species holds magnetic properties and formed well dispersed Fe3O4 nanoparticles on a carbon layer in FeC nanocomposite. Adding iron to the previous solid resulted in the formation of γ-Fe2O3 coating on the FeC type structure as in Fe/FeC composite. The highest dye adsorption capacity was 15.5 mg·g−1 for FeC nanocomposite at 25 °C with the isotherms fitting well with the Langmuir model. The removal efficiency of 98.4% was obtained with a pristine Fe sample under similar experimental conditions.

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Section: Adsorption Studiessupporting

confidence: 87%

Section: Samplesupporting

confidence: 52%

Section: Samplementioning

confidence: 90%

Section: Mössbauer Epr and Magnetization Curvesmentioning

confidence: 99%

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Acid Red 66 Dye Removal from Aqueous Solution by Fe/C-based Composites: Adsorption, Kinetics and Thermodynamic Studies

et al. 2020

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“…Significant efforts have been exerted on the development of FTS catalysts to improve the efficiency and economics of this process. For hydrogen-deficient syngas obtained from coal or biomass, iron based FTS catalysts are generally preferable to cobalt catalysts, due to their relatively low cost, low methane selectivity, and high water-gas shift (WGS) activity [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Drying Temperature on Iron Fischer-Tropsch Catalysts Prepared by Solvent Deficient Precipitation

Albretsen

Huang

Keyvanloo

et al. 2017

Journal of Nanomaterials

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A novel solvent deficient precipitation (SDP) method to produce nanoparticles was studied for its potential in Fischer-Tropsch synthesis (FTS) catalysis. Using Fe(NO 3 ) 3 ⋅9H 2 O as the iron-containing precursor, this method produces ferrihydrite particles which are then dried, calcined, reduced, and carbidized to form the active catalytic phase for FTS. Six different drying profiles, including final drying temperatures ranging between 80 and 150 ∘ C, were used to investigate the effect of ammonium nitrate (AN), a major by-product of reaction between Fe(NO 3 ) 3 ⋅9H 2 O and NH 4 HCO 3 in the SDP method. Since AN has two phase-transitions within this range of drying temperatures, three different AN phases can exist during the drying of the catalyst precursors. These AN phases, along with physical changes occurring during the phase transitions, may affect the pore structure and the agglomeration of ferrihydrite crystallites, suggesting possible reasons for the observed differences in catalytic performance. Catalysts dried at 130 ∘ C showed the highest FTS rate and the lowest methane selectivity. In general, better catalytic performance is related to the AN phase present during drying as follows: phase III > phase II > phase I. However, within each AN phase, lower drying temperatures led to better catalytic properties.

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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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On the structural, textural and morphological features of Fe-based catalysts supported on polystyrene mesoporous carbon for Fischer–Tropsch synthesis

Cited by 21 publications

References 59 publications

Acid Red 66 Dye Removal from Aqueous Solution by Fe/C-based Composites: Adsorption, Kinetics and Thermodynamic Studies

Acid Red 66 Dye Removal from Aqueous Solution by Fe/C-based Composites: Adsorption, Kinetics and Thermodynamic Studies

Effect of Drying Temperature on Iron Fischer-Tropsch Catalysts Prepared by Solvent Deficient Precipitation

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

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