Development of a kinetic model for Fischer–Tropsch synthesis over Co/Ni/Al2O3 catalyst

Fazlollahi, Farhad; Sarkari, Majid; Zare, Akbar; Mirzaei, Ali Akbar; Atashi, Hossein

doi:10.1016/j.jiec.2011.10.011

Cited by 42 publications

(25 citation statements)

References 39 publications

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“…Based on this model, calculated data show good agreement with experimental results over CoNi/Al 2 O 3 catalysts [42,43]. By applying the density function theory (DFT) over the different Co structures for the CO methanation suggested that the mechanism through the formyl intermediate is the most favorable for the flat Co surface [44]. To facilitate model discrimination, we considered k (a kinetic parameter group) as the reaction rate constant and a (an equilibrium constant group) as the adsorption parameter.…”

Section: Kinetic Modeling and Derivation Rate Reactionmentioning

confidence: 60%

Impact of Na Promoter on Structural Properties and Catalytic Performance of CoNi/Al2O3 Nanocatalysts for the CO Hydrogenation Process: Fischer–Tropsch Technology

2015

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This work deals with the effect of adding Na to bimetallic sol-gel derived alumina supported Co/Ni nanocatalysts in Fischer-Tropsch synthesis. The catalyst activity and selectivity changed with different levels of Na, and the catalyst with 2 % Na loading was selected as an optimal catalyst to compare with un-promoted Co/Ni/ Al 2 O 3 catalyst. Na reduced the methane selectivity by increasing the chain-growth probability (a-value) at 12 bar. The results of physico-chemical characterizations show that the Na promoter plays a significant role in the catalytic structure. Additionally, the kinetic behavior was considered in absence and presence of Na over CoNi/Al 2 O 3 catalysts. We applied an enolic approach, which was developed based on the interaction between adsorption HCO and dissociated adsorption hydrogen, through the Langmuir-Hinshelwood-Hougen-Watson (LHHW) adsorption theory. Kinetic parameters, including the rate constant (k) and activation energy (E a ) of the catalysts, were also determined. The results show that, by adding Na, the activation energy (E a ) decreases and the reaction rate (-R CO ) increases. Graphical Abstract

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Section: Kinetic Modeling and Derivation Rate Reactionmentioning

confidence: 60%

Impact of Na Promoter on Structural Properties and Catalytic Performance of CoNi/Al2O3 Nanocatalysts for the CO Hydrogenation Process: Fischer–Tropsch Technology

2015

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“…29,30 The particle size range of the catalyst of 37 to 75 μm was used for FT synthesis test. 29,30 The particle size range of the catalyst of 37 to 75 μm was used for FT synthesis test.…”

Section: Catalyst and Experimental Conditionsmentioning

confidence: 99%

“…The cobalt-based catalysts was prepared by a conventional wet-impregnation approach with a compositions of 20 wt% Co and 0.5 wt% Ru on γ-alumina. 29,30 The particle size range of the catalyst of 37 to 75 μm was used for FT synthesis test. The obtained sieved catalyst was then transferred into a microchannel reactor prior to the reduction.…”

Section: Catalyst and Experimental Conditionsmentioning

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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“…Among the potential FTS catalysts, only the iron-based and cobalt-based appear to be economically feasible on an industrial scale [3,4], although cobalt catalysts have higher activity and a longer life-time than iron catalysts [5]. In addition to the active phase of the catalyst, the support also plays an important role in catalytic activity [3,6]. Previous work has shown that carbon nanotubes (CNTs) minimise the interaction of the cobalt active phase with the support [7,8].…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of Fischer–Tropsch Synthesis Using a Co/CNTs Catalyst

Pour

Karimi²,

Torshizi

et al. 2017

Progress in Reaction Kinetics and Mechanism

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The intrinsic kinetics of the Fischer–Tropsch synthesis reaction in the conversion of synthesis gas into liquid hydrocarbons in a spinning basket reactor over a cobalt catalyst supported on carbon nanotubes were studied. The catalyst was synthesised by the impregnation wetness technique and the reactor tests were done at 215–245 °C, 20 bar, a H2/CO molar ratio of 2 and a gas hourly space velocity of 2.4–12 Nl gcat−1 h−1. To develop an appropriate kinetic model for syngas consumption, five different mechanisms were considered as possibilities for the Fischer–Tropsch reaction, each with a rate-determining step. The rate equations obtained were based on the Langmuir–Hinshelwood–Hougen–Watson model and statistical analyses were used for comparing the resulting values. The activation energies were found to be limited within the range 89–145 kJ mol−1 and the adsorption constants of hydrogen and carbon monoxide were in the range −32 to −76 kJ mol−1 and −13 to −64 kJ mol−1 respectively.

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Development of a kinetic model for Fischer–Tropsch synthesis over Co/Ni/Al2O3 catalyst

Cited by 42 publications

References 39 publications

Impact of Na Promoter on Structural Properties and Catalytic Performance of CoNi/Al2O3 Nanocatalysts for the CO Hydrogenation Process: Fischer–Tropsch Technology

Impact of Na Promoter on Structural Properties and Catalytic Performance of CoNi/Al2O3 Nanocatalysts for the CO Hydrogenation Process: Fischer–Tropsch Technology

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

Kinetic Study of Fischer–Tropsch Synthesis Using a Co/CNTs Catalyst

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Development of a kinetic model for Fischer–Tropsch synthesis over Co/Ni/Al2O3 catalyst

Cited by 42 publications

References 39 publications

Impact of Na Promoter on Structural Properties and Catalytic Performance of CoNi/Al2O3 Nanocatalysts for the CO Hydrogenation Process: Fischer–Tropsch Technology

Impact of Na Promoter on Structural Properties and Catalytic Performance of CoNi/Al2O3 Nanocatalysts for the CO Hydrogenation Process: Fischer–Tropsch Technology

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

Kinetic Study of Fischer–Tropsch Synthesis Using a Co/CNTs Catalyst

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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