Activation studies with an iron fischer‐tropsch catalyst in fixed bed and stirred tank slurry reactors

Bukur, Dragomir B.; Nowicki, Ł.; Patel, Snehal A.

doi:10.1002/cjce.5450740311

Cited by 32 publications

(39 citation statements)

References 20 publications

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“…These catalysts were prepared by incipient wetness replacing SiO 2 with spent FCC material as a support. The Ruhrchemie catalyst is a robust precipitated iron catalyst for the F-T synthesis and was used initially in commercial fixed bed reactors at Sasol in South Africa [24,25]. Two different commercial spent FCC catalysts were procured from Engelhard and Albemarle Corporation for this purpose and were used in this study without any further modification.…”

Section: Methodsmentioning

confidence: 99%

Attrition Resistant Fischer-Tropsch Catalysts Based on FCC Supports

Adeyiga¹

2010

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Section: Methodsmentioning

confidence: 99%

Attrition Resistant Fischer-Tropsch Catalysts Based on FCC Supports

Adeyiga¹

2010

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“…A schematic of the product analysis procedure is shown in Figure 2. Further details on the experimental set up, operating procedures, and product quantification can be found elsewhere Zimmerman and Bukur, 1990;Bukur et al, 1994;Bukur et al, 1996).…”

Section: Methodsmentioning

confidence: 99%

Kinetics of Slurry Phase Fischer-Tropsch Synthesis

Bukur¹,

Froment²,

Olewski³

2006

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This report covers the fourth year of a research project conducted under the University Coal Research Program. The overall objective of this project is to develop a comprehensive kinetic model for slurry-phase Fischer-Tropsch synthesis (FTS) employing iron-based catalysts. This model will be validated with experimental data obtained in a stirred-tank slurry reactor (STSR) over a wide range of process conditions. The model will be able to predict molar flow rates and concentrations of all reactants and major product species (water, carbon dioxide, linear 1-and 2-olefins, and linear paraffins) as a function of reaction conditions in the STSR.During the fourth year of the project, an analysis of experimental data collected during the second year of this project was performed. Kinetic parameters were estimated utilizing product distributions from 27 mass balances. During the reporting period two kinetic models were employed: a comprehensive kinetic model of Dr. Li and co-workers and a hydrocarbon selectivity model of Van der Laan andBeenackers (1998, 1999) The kinetic model of Yang et al. (2003) has 24 parameters (20 parameters for hydrocarbon formation, and 4 parameters for the water-gas-shift (WGS) reaction). Kinetic parameters for the WGS reaction and FTS synthesis were estimated first separately, and then simultaneously. The estimation of these kinetic parameters employed the Levenberg-Marquardt (LM) method and the trust-region reflective Newton large-scale (LS) method. A genetic algorithm (GA) was incorporated into estimation of parameters for FTS reaction to provide initial estimates of model parameters.All reaction rate constants and activation energies were found to be positive, but at the 95% confidence level the intervals were large. Agreement between predicted and experimental reaction rates has been fair to good. Light hydrocarbons are predicted fairly accurately, whereas the model underpredicts values of higher molecular weight hydrocarbons.Van der Laan and Beenackers hydrocarbon selectivity model provides a very good fit of the experimental data for hydrocarbons up to about C 20. However, the experimental data shows higher paraffin formation rates in C 12 -C 25 region which is likely due to hydrocracking or other secondary reactions. The model accurately captures the observed experimental trends of decreasing olefin to paraffin ratio and increasing α (chain growth length) with increase in chain length.

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“…The reactants and noncondensible products leaving the ice traps were analyzed on an on-line GC (Carle AGC 400) with multiple columns using both flame ionization and thermal conductivity detectors. Further details on the experimental set up, operating procedures and product quantification can be found elsewhere [1,2,5,8].…”

Section: Methodsmentioning

confidence: 99%

“…Sasol in South Africa. It has been tested extensively at TAMU [1][2][3][4], and was used in previous study of kinetics of Fischer-Tropsch (F-T) synthesis by Lox and Froment [5,6]. It is a robust catalyst and its selectivity is similar to that of TAMU's catalyst.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Slurry Phase Fischer-Tropsch Synthesis

Bukur¹

2004

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This report covers the second year of this three-year research grant under the University Coal Research program. The overall objective of this project is to develop a comprehensive kinetic model for slurry phase Fischer-Tropsch synthesis on iron catalysts. This model will be validated with experimental data obtained in a stirred tank slurry reactor (STSR) over a wide range of process conditions. The model will be able to predict concentrations of all reactants and major product species (H 2 O, CO 2 , linear 1-and 2-olefins, and linear paraffins) as a function of reaction conditions in the STSR.During the second year of the project we completed the STSR test SB-26203 (275-343 h on stream), which was initiated during the first year of the project, and another STSR test (SB-28603 lasting 341 h). Since the inception of the project we completed 3 STSR tests, and evaluated catalyst under 25 different sets of process conditions. A precipitated iron catalyst obtained from Ruhrchemie AG (Oberhausen-Holten, Germany) was used in all tests. This catalyst was used initially in commercial fixed bed reactors at Sasol in South Africa. Also, during the second year we performed a qualitative analysis of experimental data from all three STSR tests. Effects of process conditions (reaction temperature, pressure, feed composition and gas space velocity) on water-gas-shift (WGS) activity and hydrocarbon product distribution have been determined.

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Activation studies with an iron fischer‐tropsch catalyst in fixed bed and stirred tank slurry reactors

Cited by 32 publications

References 20 publications

Attrition Resistant Fischer-Tropsch Catalysts Based on FCC Supports

Attrition Resistant Fischer-Tropsch Catalysts Based on FCC Supports

Kinetics of Slurry Phase Fischer-Tropsch Synthesis

Kinetics of Slurry Phase Fischer-Tropsch Synthesis

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