Optimization of Fischer‐Tropsch Process in a Fixed‐Bed Reactor Using Non‐uniform Catalysts

Mazidi, S. K.; Sadeghi, Mohammad Taghi; Marvast, Mahdi Ahmadi

doi:10.1002/ceat.201200268

Cited by 21 publications

(12 citation statements)

References 43 publications

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“…However, excessively high temperatures in the catalyst bed should be avoided for the sake of system safety and FTS reaction performance 5 . Temperature runaway, which is a serious issue in practice, was observed in Mazidi's research when the reaction heat was not immediately removed 6 . Dry 7 states that higher temperatures will result in higher selectivity toward undesired methane; while it was also found that the probability of chain growth decreases when the temperature increases 8 .…”

Section: Introductionmentioning

confidence: 99%

Experimental and simulation study of the temperature distribution in a bench‐scale fixed bed Fischer–Tropsch reactor

Shen

et al. 2021

AIChE Journal

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The temperature distribution in a bench‐scale fixed bed Fischer–Tropsch reactor using Co‐based catalyst was investigated under conditions of 2 MPa and 458 K at various syngas partial pressures and space velocities. The single‐tube reactor had a diameter of 0.05 m, which is representative of the diameters used in industrial applications. With a special designed temperature measurement, the detailed temperature distribution in a bench‐scale reactor was reported for the first time. The changes of maximum temperature in the bed and hot spot region were discussed at different N2 flow rate and gas hourly space velocity. A 2D pseudo‐homogeneous fixed bed reactor model was developed using ANSYS Fluent. A position‐dependent heat‐transfer coefficient, which considered more accurate in temperature prediction, was applied. The model was validated against both the reaction results and the measured temperatures. The inferred properties within the reactor were analyzed to give insight as to how to increase the reactor production capacity.

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Section: Introductionmentioning

confidence: 99%

Experimental and simulation study of the temperature distribution in a bench‐scale fixed bed Fischer–Tropsch reactor

Shen

et al. 2021

AIChE Journal

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“…Several approaches can be used to minimize transport limitations: egg-shell catalyst with a specific thickness of the active layer [14,15], wash-coated monoliths [16], solid foams, and micro-and millireactors. Mazdidi et al have demonstrated that, by using a tubular fixed bed reactor, it is convenient to use different catalyst distributions along the bed length, as the diffusion limitations strongly depend on the reactant conversion [17].…”

Section: Introductionmentioning

confidence: 99%

“…Despite the academic and industrial interest, the models reported on in the literature are based on a simplified approach. Boukezoula and Bencheikh [17] developed a steady-state modelling approach for the aromatization of methyl cyclopentane. Thus, all the dynamic aspects are neglected; that is an essential issue to be considered within the start-up operation of a chemical plant.…”

Section: Introductionmentioning

confidence: 99%

Intraparticle Modeling of Non-Uniform Active Phase Distribution Catalyst

et al. 2020

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To maximize the performances of heterogeneous catalytic reactors, it is necessary to consider many parameters. Catalytic particle morphology (dimension, shape, active phase distribution) is generally previously established and seldom considered in the optimization of the catalyst to be specific for a given process. In this work, the influence of active phase distribution within spherical catalytic particles (egg-shell, egg-yolk and egg-white), on the yield and selectivity of a product is shown for a consecutive reaction network; here, the intermediate component is the main product of interest. Intraparticle mass and energy balances under non-steady conditions were implemented. Sensitivity studies lead to the identification of the optimal conditions, thus maximizing the yield of the intermediate for each active phase distribution. It was demonstrated that the egg-shell catalyst can maximize the intermediate yield, with a lower active-phase usage.

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“…Also, due to lower catalyst loading, the inert pellet mixing also reduces the reactor performance [153]. In practice, the non-uniform catalysts are commonly seen on Fischer-Tropsch reactors for the optimization of hydrocarbon formation [156]. The bed temperature runaway is found to be completely prevented in the optimum case and the long chain hydrocarbon selectivity (C 5 + ) is enhanced [156].…”

Section: Axis Directionmentioning

confidence: 99%

“…In practice, the non-uniform catalysts are commonly seen on Fischer-Tropsch reactors for the optimization of hydrocarbon formation [156]. The bed temperature runaway is found to be completely prevented in the optimum case and the long chain hydrocarbon selectivity (C 5 + ) is enhanced [156]. On the steam methane reforming (the reverse of methanation) reactor, catalyst dilution by adsorbent is one of the useful reactor design strategies for the thermal optimization [150].…”

Section: Axis Directionmentioning

confidence: 99%

The thermodynamics and reactor optimization of CO2 methanation

Miao¹

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Power-toGas (PtG) is an emerging grid-scale energy storage technology by which the surplus renewable electricity and captured CO2 are converted to synthetic natural gas as an energy carrier. In short, the off-grid, surplus electricity from renewable power sources such as wind and solar farms is utilized to electrolyze water via Solid-Oxide-Cell, and the generated hydrogen is then combined with CO2 through the Sabatier process to produce methane. The transportation of methane is mature and energy-efficient within the existing natural gas pipeline or town gas network. Additionally, it would be ideal to make use of the reverse function of SOEC, the Solid-Oxide-Fuel-Cell, to generate electricity when the grid is short of power. The electricity generation is important to lower the levelized cost of the energy stored in the system. On the other hand, the CO2 methanation (CO2 + 4H2 = CH4 + H2O) is one of the crucial steps in the PtG technology. It utilizes the existing natural gas infrastructure to store and transport the renewable energy in a largescale and long-distance. However, the strong exothermicity of the methanation process remains one of the major challenges for the scale-up of the technology, especially when the feedstocks are I also want to express my thank to my co-supervisor, Professor Wang Xin for his good advises on the aspect of chemical reaction engineering during our meetings and discussion. I truly appreciate the useful guidance on paper writing and critical thinking skills from my TAC member Professor Su Haibin. Without the scholarship support from my school, Nanyang Technological University, Interdisciplinary Graduate School, I couldn't have the chance and courage to pursue the degree. I would like to thank the university for providing the funding and the great environment for my study. Last but not least I would like to thank my wife and my parents for the spiritual support every day.

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Optimization of Fischer‐Tropsch Process in a Fixed‐Bed Reactor Using Non‐uniform Catalysts

Cited by 21 publications

References 43 publications

Experimental and simulation study of the temperature distribution in a bench‐scale fixed bed Fischer–Tropsch reactor

Experimental and simulation study of the temperature distribution in a bench‐scale fixed bed Fischer–Tropsch reactor

Intraparticle Modeling of Non-Uniform Active Phase Distribution Catalyst

The thermodynamics and reactor optimization of CO2 methanation

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