Preparation of mesoporous silica supported cobalt catalysts using supercritical fluids for Fischer–Tropsch synthesis

Shimizu, Tori; Ushiki, Ikuo; Ota, Masaki; Satō, Yoshiyuki; Koizumi, Naoto; Inomata, Hiroshi

doi:10.1016/j.cherd.2015.01.005

Cited by 29 publications

(11 citation statements)

References 26 publications

(33 reference statements)

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“…Massive efforts have been made and readers interested in the advancements in the field may find comprehensive reviews and selected examples. 61,[81][82][83][84][199][200][201][202][203][204][205][206][207][208][209][210][211][212][213][214] Supercritical CO2 can enhance the solubility of H2 in toluene 215 to create a homogeneous reductive environment favourable for the reductive synthesis of metal NPs. 51,87 As an example, Pd NPs (2-4 nm) were prepared in toluene flows by hydrogen reduction of Pd(ii) bis(hexafluoroacetylacetonate) and their surfaces were in situ bonded to different functional ligands solubilized in toluene and introduced during the synthesis.…”

Section: Carbon Dioxidementioning

confidence: 99%

Chemistry in supercritical fluids for the synthesis of metal nanomaterials

Musumeci

Aymonier

2019

React. Chem. Eng.

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Section: Carbon Dioxidementioning

confidence: 99%

Chemistry in supercritical fluids for the synthesis of metal nanomaterials

Musumeci

Aymonier

2019

React. Chem. Eng.

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“…However, it has the tendency to promote undesired methanation easily [12]. Fe-based catalysts are employed for the synthesis of lighter FTS products [3], while Co-based catalysts have proven to be the most effective in promoting longer chain hydrocarbons [13]. Furthermore, Co exhibits lower activity towards the water-gas-shift reaction compared to Fe catalysts.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study Based on the Carbide Mechanism of a Co-Pt/γ-Al2O3 Fischer–Tropsch Catalyst Tested in a Laboratory-Scale Tubular Reactor

et al. 2019

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A Co-Pt/γ-Al2O3 catalyst was manufactured and tested for Fischer–Tropsch applications. Catalyst kinetic experiments were performed using a tubular fixed-bed reactor system. The operative conditions were varied between 478 and 503 K, 15 and 30 bar, H2/CO molar ratio 1.06 and 2.11 at a carbon monoxide conversion level of about 10%. Several kinetic models were derived, and a carbide mechanism model was chosen, taking into account an increasing value of termination energy for α-olefins with increasing carbon numbers. In order to assess catalyst suitability for the determination of reaction kinetics and comparability to similar Fischer–Tropsch Synthesis (FTS) applications, the catalyst was characterized with gas sorption analysis, temperature-programmed reduction (TPR), and X-ray diffraction (XRD) techniques. The kinetic model developed is capable of describing the intrinsic behavior of the catalyst correctly. It accounts for the main deviations from the typical Anderson-Schulz-Flory distribution for Fischer–Tropsch products, with calculated activation energies and adsorption enthalpies in line with values available from the literature. The model suitably predicts the formation rates of methane and ethylene, as well as of the other α-olefins. Furthermore, it properly estimates high molecular weight n-paraffin formation up to carbon number C80.

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“…Ordered Mesoporous Silica (OMS) are considered of a great interest due to their unique properties such as highly ordered pore structures, high specific surface area, as well as tunable pore size and volume. OMS used as catalyst supports is suitable for reactions involving bulky molecules and its structure is convenient for avoiding the agglomeration and coalescence of the deposited catalyst particles, resulting in higher catalyst dispersion [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence, several studies have been performed on the support pore size effect on cobalt Fischer-Tropsch catalysts. Outcomes on those studies reported that wide pore catalysts supports are preferable for higher CO conversion and higher selectivity to hydrocarbons with longer than five carbon atoms (SC5 + ) in length [3,[15][16][17][18][19]. Subsequently, new mesoporous structures are investigated to find new outcomes not only in cobalt catalyst for FTS but also for other applications.…”

Section: Introductionmentioning

confidence: 99%

Silica with 3D Mesocellular Pore Structure Used as Support for Cobalt Fischer-Tropsch Catalyst

Pardo-Tarifa¹,

Sánchez²,

Claure³

et al. 2017

Synth Catal

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The typical MCM-41 and SBA-15 silica types were modified in order to expand their pores by addition of a swelling agent at mild conditions. The MCM-41, SBA-15 and Pore-expanded (PE) mesoporous silicas, i.e., PE-SBA-15 and PE-MCM-41 were synthesized by the atrane route and used as supports in the preparation of cobalt Fischer-Tropsch catalysts. The synthetized silicas presented a homogeneous morphology with narrow pore size distribution of 1D, 2D and 3D pore structures. The most interesting pore structure and size was presented by the PE-SBA-15 silica, which showed a 3D spherical cell structure of 30 nm diameter interconnected by small window pores of 7 nm of diameter. These supports were used in cobalt catalyst preparation. The characterization results showed that the pore structure and pore size affected the growth of cobalt oxide particles and cobalt-silica interaction. These factors played an important role on the cobalt dispersion and Degree of Reduction (DOR). Co/SBA-15 and Co/PE-SBA-15 catalysts presented similar physicochemical properties related with the Co 3 O 4 , but the pore size and structure of the support was different. All the catalysts were tested in Fischer-Tropsch reaction at close to industrial conditions. Co/PE-SBA-15 catalyst showed the best CO conversion and selectivity to long-chain hydrocarbons, results attributed to the higher degree of reduction of cobalt but mainly to the open network with 3D structure pores of the silica support which reduced the diffusion limitations of the reactants and products.

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Preparation of mesoporous silica supported cobalt catalysts using supercritical fluids for Fischer–Tropsch synthesis

Cited by 29 publications

References 26 publications

Chemistry in supercritical fluids for the synthesis of metal nanomaterials

Chemistry in supercritical fluids for the synthesis of metal nanomaterials

Kinetic Study Based on the Carbide Mechanism of a Co-Pt/γ-Al2O3 Fischer–Tropsch Catalyst Tested in a Laboratory-Scale Tubular Reactor

Silica with 3D Mesocellular Pore Structure Used as Support for Cobalt Fischer-Tropsch Catalyst

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