Generalized kinetic model for iron and cobalt based Fischer–Tropsch synthesis catalysts: Review and model evaluation

Mousavi, Shabbir; Zamaniyan, Akbar; Irani, Mohammad; Rashidzadeh, Mehdi

doi:10.1016/j.apcata.2015.08.020

Cited by 64 publications

(55 citation statements)

References 82 publications

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“…Although the actual chemistry is complex and involves a great many elementary steps, Table 2 summarizes the processes in terms of fiv e global reactions [90,91] . The reactants are H 2 and CO with the ratio of H 2 to CO being approximately two.…”

Section: Fischer-tropsch Synthesismentioning

confidence: 99%

Process intensification in the catalytic conversion of natural gas to fuels and chemicals

Kee

Karakaya

Zhu

2017

Proceedings of the Combustion Institute

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This paper explores alternative technologies for the conversion of natural gas to higher-value products. Because of methane's chemical stability, all practical processes require elevated temperature (e.g., T > 700 °C) and catalysts to activate the methane. Some approaches are mature and widely practiced at the commercial scale (e.g., steam reforming and Fischer-Tropsch synthesis). Others are emerging, based on laboratory-scale experimentation (e.g., oxidative coupling of methane). In all cases, the present paper is concerned with aspects of process intensification, seeking chemical methods and reactor implementations that can improve overall performance. Performance metrics include reactor size, energy efficiency, conversion rates, and product selectivity. Process intensification approaches include integrated microchannel reactors and heat exchangers as well as a range of permselective membranes.

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Section: Fischer-tropsch Synthesismentioning

confidence: 99%

Process intensification in the catalytic conversion of natural gas to fuels and chemicals

Kee

Karakaya

Zhu

2017

Proceedings of the Combustion Institute

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“…The kinetics and TOFs (s À 1 ) values on the P/m-CoAl, which was defined as (reacted CO molecules)/(surface cobalt atom·s), are summarized in supplementary Table S4 and Table 3. The reaction rate and rate constant, which were calculated by using the previously reported kinetic equation, [8] were maximized on the P(3)/m-CoAl in all tested temperature ranges like 0.00967 mol/(L · s) and 0.00335 mol/(L · s · bar 7/4 ) at 220°C. The rate was found to be much higher than the P(0)/m-CoAl with those of 0.00509 mol/ (L · s) and 0.00176 mol/(L · s · bar 7/4 ), respectively, in the CO conversion ranges of 10-80 % as shown in supplementary Figure S8(A).…”

Section: Effects Of Newly Formed Metal Phosphates To Catalytic Activimentioning

confidence: 99%

“…[4,5] However, the supported cobalt nanoparticles can be easily deactivated through the facile aggregations of cobalt crystallites by a well-known sintering, reoxidation by water formed, and heavy hydrocarbons depositions on the active metallic cobalt sites. [5][6][7][8] In order to solve these deactivation phenomena, the highly ordered mesoporous materials such as silica, carbons or metal oxides [9][10][11] have been intensively studied since they have a larger specific surface area with a higher dispersion of cobalt nanoparticles, strong metalsupport interactions and less mass-transfer limitations. Among those mesoporous materials, the ordered mesoporous mixed metal oxides have some advantages by directly using the exposed metallic surfaces of the mesoporous frameworks as well as by lessening the aggregations of active metals.…”

Section: Introductionmentioning

confidence: 99%

Ordered Mesoporous Co₃O₄−Al₂O₃Binary Metal Oxides for CO Hydrogenation to Hydrocarbons: Synergy Effects of Phosphorus Modifier for an Enhanced Catalytic Activity and Stability

Park

Lee

et al. 2019

ChemCatChem

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The synergy effects of phosphorus modifier on highly ordered mesoporous binary metal oxides of Co 3 O 4 À Al 2 O 3 (m-CoAl), prepared by nanocasting method using a hard template of KIT-6, were observed by an enhanced catalytic and structural stability of the m-CoAl during CO hydrogenation to hydrocarbons. The enhanced structural stability of the ordered mesoporous structures on the phosphorous-modified m-CoAl at an optimal amount of phosphorous modifier below 0.3 wt%P (P (3)/m-CoAl) was attributed to the partial formation of thermally stable metal phosphates under a reductive Fischer-Tropsch synthesis (FTS) reaction condition. The positive effects of the phosphorous modifier were originated from the partially formed SiO 2 -like AlPO 4 phases on the outer surfaces of the m-CoAl, as well as from partially formed irreducible and thermally stable spinel-type cobalt aluminates (CoAl 2 O 4 ). The hydrophobic SiO 2 -like tridymite AlPO 4 surfaces on the ordered matrices of the P/m-CoAl also effectively prevented the heavy wax (or coke precursors) depositions. The structural instability of the P/m-CoAl was observed at a higher phosphorous content above 0.5wt%P by preferentially forming the largely segregated mixed metal oxides such as Co 3 O 4 À CoAl 2 O 4 À Co 3 (PO 4 ) 2 through the phase transformations of the surface excess AlPO 4 .

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“…[6][7][8][9] Among them, Fischer-Tropsch (FT) synthesis is one of the extensively investigated area using the LHHW approach. [16][17][18][19][20][21][22][23][24][25] Due to its inherent features of fast converge, less computational time together with equipped statistical analysis, the hybrid ANNs-RSM has been successfully implemented into many practical applications such as investigation of the flexible mechanism considering friction dynamics in lubricating industry, 26 structural reliabilities studies, 27 and optimization of biohydrogen productions etc. [16][17][18][19][20][21][22][23][24][25] Due to its inherent features of fast converge, less computational time together with equipped statistical analysis, the hybrid ANNs-RSM has been successfully implemented into many practical applications such as investigation of the flexible mechanism considering friction dynamics in lubricating industry, 26 structural reliabilities studies, 27 and optimization of biohydrogen productions etc.…”

Section: Introductionmentioning

confidence: 99%

A simple coupled ANNs‐RSM approach in modeling product distribution of Fischer‐Tropsch synthesis using a microchannel reactor with Ru‐promoted Co/Al ₂ O ₃ catalyst

Sun

Yang

et al. 2019

Int J Energy Res

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A simple approach using hybrid artificial neural networks (ANNs)-response surface methodology (RSM) was developed to model the detailed product distribution using Ru-promoted cobalt-based catalyst with Al 2 O 3 as the support in a microchannel reactor for Fischer-Tropsch (FT) synthesis. Using the independent process parameters for training, the established model is capable of predicting hydrocarbon production distributions, ie, paraffin formation rate (C 2 -C 15 ) and olefin to paraffin ratio (OPR C 2 -C 15 ) within acceptable uncertainties. The ANNs-RSM model and comprehensive mechanistic model using the Langmuir-Hinshelwood-Hougen-Watson (LHHW) approach were compared to identify a few inherent advantages of the proposed model in modeling complex FT synthesis. The proposed ANNs-RSM model shows its appealing merits, ie, faster converge and higher accuracy (less than ±10% uncertainties was achieved from ANNs-RSM model, while LHHW model achieved less than ±15% uncertainties except a few exceptional high errors uncertainties at certain experimental conditions). The statistical significances to the product distributions and hydrocarbon formation rate during FT synthesis could be easily identified and quantitatively analyzed by the established ANNs-RSM model.The future effective alternative of kinetic study of the complex system such as FT synthesis in the microstructured reactor might follow the methods of using empirical reliable approach for process optimization together with mechanistic kinetic study for detailed reaction pathway discrimination.

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Generalized kinetic model for iron and cobalt based Fischer–Tropsch synthesis catalysts: Review and model evaluation

Cited by 64 publications

References 82 publications

Process intensification in the catalytic conversion of natural gas to fuels and chemicals

Process intensification in the catalytic conversion of natural gas to fuels and chemicals

Ordered Mesoporous Co₃O₄−Al₂O₃Binary Metal Oxides for CO Hydrogenation to Hydrocarbons: Synergy Effects of Phosphorus Modifier for an Enhanced Catalytic Activity and Stability

A simple coupled ANNs‐RSM approach in modeling product distribution of Fischer‐Tropsch synthesis using a microchannel reactor with Ru‐promoted Co/Al ₂ O ₃ catalyst

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Generalized kinetic model for iron and cobalt based Fischer–Tropsch synthesis catalysts: Review and model evaluation

Cited by 64 publications

References 82 publications

Process intensification in the catalytic conversion of natural gas to fuels and chemicals

Process intensification in the catalytic conversion of natural gas to fuels and chemicals

Ordered Mesoporous Co3O4−Al2O3Binary Metal Oxides for CO Hydrogenation to Hydrocarbons: Synergy Effects of Phosphorus Modifier for an Enhanced Catalytic Activity and Stability

A simple coupled ANNs‐RSM approach in modeling product distribution of Fischer‐Tropsch synthesis using a microchannel reactor with Ru‐promoted Co/Al 2 O 3 catalyst

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Product

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Ordered Mesoporous Co₃O₄−Al₂O₃Binary Metal Oxides for CO Hydrogenation to Hydrocarbons: Synergy Effects of Phosphorus Modifier for an Enhanced Catalytic Activity and Stability

A simple coupled ANNs‐RSM approach in modeling product distribution of Fischer‐Tropsch synthesis using a microchannel reactor with Ru‐promoted Co/Al ₂ O ₃ catalyst