Effect of Fischer–Tropsch synthesis on the microstructure of Fe–Co-based metal/spinel composite materials

Tihay, F.; Pourroy, G.; Richard‐Plouet, Mireille; Roger, Anne‐Cécile; Kiennemann, A.

doi:10.1016/s0926-860x(00)00595-0

Cited by 82 publications

(50 citation statements)

References 31 publications

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“…It comprises both the application of the algorithm for calculating the objective function and the optimization algorithm (4) and (5). The fitting results are improved (6). The fitted optical response is visualized on the drawing canvas (7).…”

Section: Mielab's Graphical Usermentioning

confidence: 99%

See 1 more Smart Citation

MieLab: A Software Tool to Perform Calculations on the Scattering of Electromagnetic Waves by Multilayered Spheres

Peña‐Rodríguez

Pérez²,

Pal

2011

International Journal of Spectroscopy

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In this paper, we present MieLab, a free computational package for simulating the scattering of electromagnetic radiation by multilayered spheres or an ensemble of particles with normal size distribution. It has been designed as a virtual laboratory, including a friendly graphical user interface (GUI), an optimization algorithm (to fit the simulations to experimental results) and scripting capabilities. The paper is structured in five different sections: the introduction is a perspective on the importance of the software for the study of scattering of light scattering. In the second section, various approaches used for modeling the scattering of electromagnetic radiation by small particles are discussed. The third and fourth sections are devoted to provide an overview of MieLab and to describe the main features of its architectural model and functional behavior, respectively. Finally, several examples are provided to illustrate the main characteristics of the software.

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Section: Mielab's Graphical Usermentioning

confidence: 99%

“…Their optical properties can be successfully modeled using a core-shell type particle [4,5]. Moreover, in the field of nanotechnology, applications of multilayered spheres are multiple in catalysis [6], optoelectronics [7], biomedical diagnosis [8], and medicine [9][10][11], among others.…”

Section: Introductionmentioning

confidence: 99%

MieLab: A Software Tool to Perform Calculations on the Scattering of Electromagnetic Waves by Multilayered Spheres

Peña‐Rodríguez

Pérez²,

Pal

2011

International Journal of Spectroscopy

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“…The Fe 2p core-level spectra (not shown) of all catalysts show the characteristic doublet (Fe 2p 3/2 -Fe 2p 1/2 ) of iron species, whose splitting is about 13.6 eV. On looking at the most intense Fe2p 3/2 component, a minor peak placed at 707.3 eV belonging to metallic iron is observed for all samples [15], whereas a major peak whose maximum intensity is located at 710.5 eV is usually assigned to iron oxide [16]. As no satellite line is observed somewhere around 719.0 eV indicative of the presence of Fe 3+ ions, it is inferred that the iron oxides responsible for the peak around 710.5 eV in the reduced catalysts comes from partially reduced iron oxides such as Fe 3 O 4 (magnetite) species.…”

Section: Catalyst Characterizationmentioning

confidence: 90%

Hydrocarbons Synthesis From a Simulated Biosyngas Feed Over Fe/Sio2, Catalysts

Ubilla¹,

Garcı́a²,

Fierro

et al. 2010

J. Chil. Chem. Soc.

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The Fischer Tropsch reaction, using a simulated gas mixture similar to that obtained from biomass transformation (biosyngas), was studied over Fe/SiO 2 catalysts. The reaction was carried out in a stainless steel fixed bed reactor at 300 ºC and 1 MPa. Excess solvent impregnation was used to prepare the catalysts. Nitrogen adsorption at -196 ºC, thermal programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM) were used as characterization methods. The highest CO conversion was obtained for the catalyst with Fe-loading of 15wt% whereas it decreased at higher Fe loadings. The decrease of the activity is explained in terms of the drop of the active sites due to the formation of large Fe metallic aggregates. The Fe/SiO 2 catalysts presented a wide distribution of liquid hydrocarbons (C 6 to C 18 + ) and high methane formation. The liquid product distribution was related to the average size of iron particles. The increase of iron particle size favours the formation of hydrocarbons centred in C 11-14 chain length.

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“…• C is considered to be the optimum operating temperature because of high-CO conversion, total selectivity of light olefins products, low CH 4 , and not formation of coke.…”

Section: Effect Of Reactionmentioning

confidence: 99%

“…An approach to improve the selectivity of the classical Fischer-Tropsch (FT) process for conversion of synthesis gas to hydrocarbons involves the use of a bifunctional catalyst system containing a metal catalyst (FT catalyst) combined with a support. There has been renewed interest in recent years in FT synthesis, especially for the selective production of petrochemical feedstocks such as ethylene, propylene, and buthylene (C 2 -C 4 olefins) directly from synthesis gas [1][2][3][4][5][6][7]. Compared to other metal catalysts for Fischer-Tropsch (FT) synthesis, an iron-based catalyst is distinguished by higher conversion, selectivity to the lower olefins, and flexibility to the process parameters [8,9].…”

Section: Introductionmentioning

confidence: 99%

Spatial Heterogeneity and Imperfect Mixing in Chemical Reactions: Visualization of Density-Driven Pattern Formation

2011

Physical Chemistry

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Iron manganese oxides are prepared using a coprecipitation procedure and studied for the conversion of synthesis gas to light olefins and C 5 + hydrocarbons. In particular, the effect of a range of preparation variables such as [Fe]/[Mn] molar ratios of the precipitation solution, pH of precipitation, temperature of precipitation, and precipitate aging times was investigated in detail. The results are interpreted in terms of the structure of the active catalyst and it has been generally concluded that the calcined catalyst (at 650• C for 6 hours) containing 50%Fe/50%Mn-on molar basis which is the most active catalyst for the conversion of synthesis gas to light olefins. The effects of different promoters and supports with loading of optimum support on the catalytic performance of catalysts are also studied. It was found that the catalyst containing 50%Fe/50%Mn/5 wt.%Al 2 O 3 is an optimum-modified catalyst. The catalytic performance of optimal catalyst has been studied in operation conditions such as a range of reaction temperatures, H 2 /CO molar feed ratios and a range of total pressures. Characterization of both precursors and calcined catalysts is carried out by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), BET specific surface area and thermal analysis methods such as TGA and DSC.

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Effect of Fischer–Tropsch synthesis on the microstructure of Fe–Co-based metal/spinel composite materials

Cited by 82 publications

References 31 publications

MieLab: A Software Tool to Perform Calculations on the Scattering of Electromagnetic Waves by Multilayered Spheres

MieLab: A Software Tool to Perform Calculations on the Scattering of Electromagnetic Waves by Multilayered Spheres

Hydrocarbons Synthesis From a Simulated Biosyngas Feed Over Fe/Sio2, Catalysts

Spatial Heterogeneity and Imperfect Mixing in Chemical Reactions: Visualization of Density-Driven Pattern Formation

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