An investigation of the kinetics and mechanism of Fischer–Tropsch synthesis on Fe–Co–Mn supported catalyst

Arsalanfar, Maryam; Mirzaei, Ali Akbar; Atashi, Hossein; Bozorgzadeh, Hamid Reza; Vahid, Samaneh; Zare, Akbar

doi:10.1016/j.fuproc.2011.12.018

Cited by 56 publications

(24 citation statements)

References 46 publications

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“…The Arrhenius plot of the CO conversion rate plotted for the temperature range between 280 1C and 300 1C generated a straight line and shows apparent activation energy of 104 kJ/mol. This apparent activation energy value is similar to the reported values for the FTS process utilizing different catalyst compositions (Yates and Satterfield, 1991;Arsalanfar et al, 2012).…”

Section: Carbon Numbersupporting

confidence: 89%

Direct syngas hydrogenation over a Co–Ni bimetallic catalyst: Process parameter optimization

Ramasamy

Gray

Job

et al. 2015

Chemical Engineering Science

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Low metal loading Co-Ni bimetallic catalyst for the CO hydrogenation/FTS. Very high olefin to paraffin ratio generated. The highest olefin to paraffin ratio of 8 was observed for C 3 hydrocarbon. Demonstrated dual bed configuration to convert oxygenates. a b s t r a c tThe syngas hydrogenation activity of the Co-Ni bimetallic catalyst containing total metal loading less than 10 wt% was prepared via a wet impregnation method and was studied with respect to the reaction temperature and the catalyst composition. Among the hydrocarbons generated, small olefinic compounds between C 2 and C 7 (up to 40%) were the highest in the product mixture. The olefin to paraffin ratio for C 3 hydrocarbon is around 8. For all variables tested, the product distribution contains up to 10% oxygenates along with the hydrocarbon compounds. An acidic alumina containing reactor was added followed by the Co-Ni containing reactor to demonstrate the deoxygenation of oxygenates generated from the FTS process to improve the small olefinic fraction and the overall carbon yield to the valuable products.

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Section: Carbon Numbersupporting

confidence: 89%

Direct syngas hydrogenation over a Co–Ni bimetallic catalyst: Process parameter optimization

Ramasamy

Gray

Job

et al. 2015

Chemical Engineering Science

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“…It has also been reported that TiO 2 -supported Co-Mn catalyst enhanced the selectivity to higher olefins and middle distillate [3]. Arsalanfar and co-workers [1] recently reported the kinetics and mechanism of Fe-Co-Mn system at temperature range of 290-320 °C and reaction pressure of 1-10 bar. Their findings show that the C 5+ DA VID PUBLISHING D selectivity was enhanced with increasing reaction pressure.…”

Section:  1 Introductionmentioning

confidence: 94%

“…Fischer-Tropsch (FT) synthesis is a process which deals with the chemical conversion of syngas (a mixture of carbon monoxide and hydrogen) derived from coal, biomass and natural gas into hydrocarbons consisting of paraffins, olefins, alcohols and aldehydes [1]. Due to uncertainty in the Middle East, limited petroleum reserves and environmental restrictions, FT reaction is gaining more attention nowadays than ever.…”

Section:  1 Introductionmentioning

confidence: 99%

Effects of Pressure on the Performance of CNTs-Supported Catalyst in a Fischer-Tropsch Reaction

Zabidi¹,

Ali²,

Subbarao³

2014

JMSE-B

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Fischer-Tropsch (FT) reaction involves conversion of syngas (a mixture of carbon monoxide and hydrogen) into higher hydrocarbons in the presence of an active catalyst. The syngas can be derived from non-petroleum feedstocks such as coal, biomass and natural gas, thus the FT reaction provides an alternative route for production of clean fuels. The FT process has received growing interest in recent years due to uncertainty in the Middle East, fast depletion of fossil fuel and environmental concern. This paper reports the synthesis, physicochemical properties and catalytic performance of cobalt-based catalyst in the FT reaction. The catalysts comprised metal nanoparticles supported on carbon nanotubes (CNTs) which were synthesized via a wet impregnation method. The catalysts were characterized using transmission electron microscopy (TEM), temperature-programmed reduction/desorption (TPR/TPD) and X-ray photoelectron spectroscopy (XPS). The performance of the cobalt-based catalyts in a FT reaction was evaluated in a fixed bed microreactor equipped with an on-line gas chromatograph for analyses of hydrocarbon products. The catalysts investigated in this work were Co/CNTs, 70Co30Mn/CNTs, 0.06%K/70Co30Fe/CNTs and 0.04%Nb/70Co30Fe/CNTs. TEM analyses revealed that the average sizes of the metal nanoparticles were 4-5 nm. Based on TPD analyses, the dispersion of these nanoparticles on CNTs were greater than 90%. The presence of both Co 2+ and Co 3+ ions were confirmed by XPS analysis. The 0.04%Nb/70Co30Fe/CNTs catalyst performed better than other catalysts in the FT reaction where it resulted in CO conversion of 35% and 16% C 5+ selectivity at pressure of 1 bar, 220 °C and H 2 :CO of 2:1. Using the same catalyst, the CO conversion and C 5+ selectivity increased to 60% and 57%, respectively when the pressure was increased to 20 bar.

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“…For each run in a differential reactor, molar flow rate of carbon monoxide in feed is calculated from Eq. (12) [21]. …”

Section: Catalyst Testingmentioning

confidence: 99%

“…Two prominent proposed kinetic mechanisms, including carbide and enolic, have been used to describe the FT reaction rate those based on involving elementary steps, and those derived empirically. Conventional Langmuir-Hinshelwood-Hougen-Watson (LHHW) expressions based on three leading FT mechanisms have been put forward by a number of authors [12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

How do the preparation methods impact the kinetic parameters of the two Co/Ni/Al2O3 nanocatalysts in Fischer–Tropsch process?

2015

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The influence of the preparation methods on the kinetics of Fischer-Tropsch (FT) synthesis in a fixed-bed reactor is investigated by kinetic tests employing two 80 %Co/20 %Ni/Al 2 O 3 catalysts prepared through: (a) cogelling support and cobalt, as well as nickel (SG), and (b) impregnating cobalt and nickel with sol-gel derived support (IM-SG). The kinetics for both the catalysts is developed on the basis of Langmuir-Hinshelwood-Hougen-Watson (LHHW) type models at the same range: T = 200-250°C, P = 1-10 bar, gas hourly space velocity (GHSV) = 4200 h -1 and H 2 /CO mole ratio of 1/1-3/1. According to the enolic and carbide mechanisms, eight kinetic expressions of the CO consumption rate have been tested. The achieved best fitted model is subject to a good correlation between experimental and theoretical data; and the kinetic parameters are estimated by the use of Levenberg-Marquardt algorithm. Kinetic parameters such as rate constant (k) and activation energy (E a ) suggest that the preparation method remarkably impact the FT behavior. The IM-SG sample was selected as the better catalyst due to a higher reaction rate and less activation energy comparing with the SG catalyst. Graphical abstract

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An investigation of the kinetics and mechanism of Fischer–Tropsch synthesis on Fe–Co–Mn supported catalyst

Cited by 56 publications

References 46 publications

Direct syngas hydrogenation over a Co–Ni bimetallic catalyst: Process parameter optimization

Direct syngas hydrogenation over a Co–Ni bimetallic catalyst: Process parameter optimization

Effects of Pressure on the Performance of CNTs-Supported Catalyst in a Fischer-Tropsch Reaction

How do the preparation methods impact the kinetic parameters of the two Co/Ni/Al2O3 nanocatalysts in Fischer–Tropsch process?

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