Fischer-Tropsch synthesis over an alumina-supported cobalt catalyst in a fixed bed reactor – Effect of process parameters

A detailed kinetic model describing the consumption of key components and product distribution in the Fischer-Tropsch synthesis (FTS) over a 20%Co/0.5Re γ-Al 2 O 3 commercial catalyst is developed. The developed model incorporates the H 2 Oassisted CO dissociation mechanism developed by Rytter and Holmen and a novel approach to product distribution modeling. The model parameters are optimized against an experimental dataset comprising a range of process conditions: total pressure 2.0-2.2 MPa, temperature 210-230 C, CO conversion range of 10%-75% and feed with and without added water. The quality of the model fit measured in terms of mean absolute relative residuals (MARR) value is 23.1%, which is comparable to literature reported values. The developed model can accurately describe both positive and negative effects of water on the rate kinetics, the positive effect of water on the growth factor, temperature and syngas composition on the kinetics and product distribution over a wide range of process conditions, which is critical for the design and optimization of the Fisher-Tropsch reactors.

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“…Altogether, 105 data points were obtained and applied for kinetic modeling. Further details on the kinetic study can be found elsewhere 7,61,62 …”

Section: Methodsmentioning

confidence: 99%

Modeling Fischer–Tropsch kinetics and product distribution over a cobalt catalyst

et al. 2021

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“…The olefin to paraffin ratio reduced from 0.54 to 0.15. This finding presented that greater reaction temperature enhances the carbon monoxide conversion, but for C 5+ selectivity, increasing reaction temperature leads to a hydrocarbon chain moves towards a shorter chain [32,34]. [35].…”

Section: Influence Of Reaction Temperature On Catalyst Efficiencymentioning

confidence: 95%

“…Simultaneously, the WGS reaction rate rises from 0.55 to 0.80. The rate of WGS reaction or CO 2 formation can be increased and related to the rise in water semi-pressure, owing to the rise in Fischer-Tropsch synthesis reaction rate [32]. A comparison of hydrocarbon product selectivity for 95Co5Mn/CNT catalysts at 220 • C and 280 • C shows a significant change with decreases in molecular weight hydrocarbons for greater reaction temperature [33].…”

Section: Influence Of Reaction Temperature On Catalyst Efficiencymentioning

confidence: 99%

Effect of Temperature, Syngas Space Velocity and Catalyst Stability of Co-Mn/CNT Bimetallic Catalyst on Fischer Tropsch Synthesis Performance

et al. 2021

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The effect of reaction temperature, syngas space velocity, and catalyst stability on Fischer-Tropsch reaction was investigated using a fixed-bed microreactor. Cobalt and Manganese bimetallic catalysts on carbon nanotubes (CNT) support (Co-Mn/CNT) were synthesized via the strong electrostatic adsorption (SEA) method. For testing the performance of the catalyst, Co-Mn/CNT catalysts with four different manganese percentages (0, 5, 10, 15, and 20%) were synthesized. Synthesized catalysts were then analyzed by TEM, FESEM, atomic absorption spectrometry (AAS), and zeta potential sizer. In this study, the temperature was varied from 200 to 280 °C and syngas space velocity was varied from 0.5 to 4.5 L/g.h. Results showed an increasing reaction temperature from 200 °C to 280 °C with reaction pressure of 20 atm, the Space velocity of 2.5 L/h.g and H2/CO ratio of 2, lead to the rise of CO % conversion from 59.5% to 88.2% and an increase for C5+ selectivity from 83.2% to 85.8%. When compared to the other catalyst formulation, the catalyst sample with 95% cobalt and 5% manganese on CNT support (95Co5Mn/CNT) performed more stable for 48 h on stream.

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“…The BTL includes the two main processes of (i) biomass gasification to produces syn-gas, a mixture of hydrogen (H 2 ) and carbon monoxide (CO) by partial oxidation, [2] and then (ii) the syn-gas is fed into the Fischer-Tropsch process (FT) where H 2 and CO at the suitable molar ratio of 1.75-2.25 : 1 react on the catalyst surface to form hydrocarbon (HC) products that are used as fuels, such as liquid petroleum gas (LPG), gasoline, kerosene, and diesel. [3] However, many articles have reported on the limitation of biomass gasification [4][5][6][7][8] which includes an unstable gas product composition, such as a H 2 /CO molar ratio well outside of the desired 2 : 1, and a high content of carbon dioxide (CO 2 ) in the gas product that causes a low-quality gas and results in a low conversion level in the FT process. [9,10] Hence, in this research, the CO 2 conversion to HC fuels was studied for application in the BTL process aiming for a higher process efficiency and to be able to cover more types of biomass substrates.…”

Section: Introductionmentioning

confidence: 99%

“…[14] In addition, there are many direct synthesis HCs from CO 2 hydrogenation investigation have reported the consistency in high level of CO selectivity according to severe RWGS side reaction and deactivation of the catalyst. [3,11,[15][16][17][18][19][20] Hybrid catalysts composed of a Cu-based catalyst and H-β zeolite are widely used for the CO 2 hydrogenation to LPG reaction, as MeOH synthesis and MeOH dehydration catalysts, respectively. Hydrogenation of CO 2 to LPG over a hybrid catalyst of Cu/ZnO/ZrO 2 /Al 2 O 3 (CZZA) and Pd-β zeolite demonstrated a stable activity over 100 h and a high selectivity for LPG HCs (75 %) but a low CO 2 conversion level (25.2 %).…”

Section: Introductionmentioning

confidence: 99%

Direct Synthesis of Liquefied Petroleum Gas from Carbon Dioxide Using a Copper/Zinc Oxide/Zirconia/Alumina and HY Zeolite Hybrid Catalyst

Natakaranakul

Thongkam

et al. 2021

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Conversion of CO 2 to lower hydrocarbons (HCs) is a high potential process that could reduce and sustainably control this greenhouse gas. In accord with The Sustainable Development Goal from The United Nation Development Program, liquefied petroleum gas (LPG) is viewed as environmentally friendly and is widely used. Small HCs can be directly synthesized from CO 2 hydrogenation over a hybrid catalyst. The main purpose of this study was to investigate the direct synthesis of LPG from CO 2 hydrogenation using a copper/zinc oxide/zirconium/alumina (CZZA) mixed metal and HY zeolite as a hybrid catalyst. The study was conducted in a fixed bed reactor using hydrogen/ CO 2 /carbon monoxide as the reactant gas and evaluating four types of production condition, method of catalyst combination, reaction temperature, CZZA/HY zeolite mass ratio, and catalyst weight/volume flow rate. The mixing type between the CZZA and HY zeolite catalysts markedly influenced the HC selectivity with strong suppression of reverse water gas shift reaction. At the optimum condition, a 27.39 % CO 2 conversion level and a high HC (98.70 %) and LPG (66.56 %) selectivity were obtained.

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Fischer-Tropsch synthesis over an alumina-supported cobalt catalyst in a fixed bed reactor – Effect of process parameters

Cited by 27 publications

References 38 publications

Modeling Fischer–Tropsch kinetics and product distribution over a cobalt catalyst

Modeling Fischer–Tropsch kinetics and product distribution over a cobalt catalyst

Effect of Temperature, Syngas Space Velocity and Catalyst Stability of Co-Mn/CNT Bimetallic Catalyst on Fischer Tropsch Synthesis Performance

Direct Synthesis of Liquefied Petroleum Gas from Carbon Dioxide Using a Copper/Zinc Oxide/Zirconia/Alumina and HY Zeolite Hybrid Catalyst

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