Kinetic study of CO hydrogenation over co-precipitated iron–nickel catalyst

Mirzaei, Ali Akbar; Kiai, Rouhoullah M.; Atashi, Hossein; Arsalanfar, Maryam; Shahriari, Sara

doi:10.1016/j.jiec.2012.01.003

Cited by 31 publications

(17 citation statements)

References 43 publications

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“…In order to determine the most suitable kinetic model for a particular catalyst, all possible combinations of FT reactions were considered and rate equations were developed based on CO conversion. A number of Langmuir-Hinshelwood and Eley-Rideal models have been developed for kinetics of CO hydrogenation to hydrocarbons in different types of reactors over the past few years [80][81][82]. In this study, it was assumed that the FT reactions occur only at active sites and proposed six possible mechanisms for FT reactions to develop kinetic models in the microchannel microreactor as shown in Table 2.…”

Section: Mechanism and Kineticsmentioning

confidence: 99%

Kinetics of Fischer–Tropsch Synthesis in a 3-D Printed Stainless Steel Microreactor Using Different Mesoporous Silica Supported Co-Ru Catalysts

et al. 2019

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Fischer–Tropsch (FT) synthesis was carried out in a 3D printed stainless steel (SS) microchannel microreactor using bimetallic Co-Ru catalysts on three different mesoporous silica supports. CoRu-MCM-41, CoRu-SBA-15, and CoRu-KIT-6 were synthesized using a one-pot hydrothermal method and characterized by Brunner–Emmett–Teller (BET), temperature programmed reduction (TPR), SEM-EDX, TEM, and X-ray photoelectron spectroscopy (XPS) techniques. The mesoporous catalysts show the long-range ordered structure as supported by BET and low-angle XRD studies. The TPR profiles of metal oxides with H2 varied significantly depending on the support. These catalysts were coated inside the microchannels using polyvinyl alcohol and kinetic performance was evaluated at three different temperatures, in the low-temperature FT regime (210–270 °C), at different Weight Hourly Space Velocity (WHSV) in the range of 3.15–25.2 kgcat.h/kmol using a syngas ratio of H2/CO = 2. The mesoporous supports have a significant effect on the FT kinetics and stability of the catalyst. The kinetic models (FT-3, FT-6), based on the Langmuir–Hinshelwood mechanism, were found to be statistically and physically relevant for FT synthesis using CoRu-MCM-41 and CoRu-KIT-6. The kinetic model equation (FT-2), derived using Eley–Rideal mechanism, is found to be relevant for CoRu-SBA-15 in the SS microchannel microreactor. CoRu-KIT-6 was found to be 2.5 times more active than Co-Ru-MCM-41 and slightly more active than CoRu-SBA-15, based on activation energy calculations. CoRu-KIT-6 was ~3 and ~1.5 times more stable than CoRu-SBA-15 and CoRu-MCM-41, respectively, based on CO conversion in the deactivation studies.

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Section: Mechanism and Kineticsmentioning

confidence: 99%

Kinetics of Fischer–Tropsch Synthesis in a 3-D Printed Stainless Steel Microreactor Using Different Mesoporous Silica Supported Co-Ru Catalysts

et al. 2019

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“…In order to evaluate the behavior of product selectivity and CO conversion with temperature and pressure and also to determine the optimum range of operational condition (pressure and temperature), in which selectivity of desired products (C þ 5 ) was maximized and undesired products (CH 4 ) was minimized, modeling was necessary. In the reference experimental work (Mirzaei et al 2012), CO conversion or products selectivity were reported in limited points such as T: 563, 573 K…, and P: 2, 3, 4 bar…hence, it was impossible to determine the CO conversion or products selectivity from unseen points. Therefore, modeling becomes an asset in determining the exact CO conversion or products selectivity for any temperature or pressure such as 547 K or 3.5 bar, and also to demonstrate the interaction between the parameters.…”

Section: Modeling Methodsmentioning

confidence: 99%

“…Moreover, in order to develop RSM models, it is necessary to collect experimental data based on the DOE methods. In the reference work (Mirzaei et al 2012), experimental data were not collected by DOE methods. To compensate for this drawback, ANNs in which original data were trained to produce appropriate input data for RSM were constructed.…”

Section: Modeling Methodsmentioning

confidence: 99%

“…Furthermore this method is very helpful in different industries to increase preferable products and also to decrease undesirable ones by manipulating operating conditions. Mirzaei et al (2012) attempted to obtain the experimental data from fixed bed micro reactor. The catalyst was prepared by co-precipitation method.…”

Section: Introductionmentioning

confidence: 99%

“…The catalyst (Fe-Ni/Al 2 O 3 ) was dried at 383.15 K for 16 h and calcined at 873.15 K in flowing air for 6 h at 5 8C/min the catalyst was used under reaction conditions of Fischer-Tropsch synthesis. Experimental data were obtained in 54 runs (Mirzaei et al 2012).…”

Section: Introductionmentioning

confidence: 99%

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Modeling of liquid hydrocarbon products from syngas

Atashi

Hajisafari

Rezaeian

et al. 2018

Int J Coal Sci Technol

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The modeling of hydrocarbon selectivity and CO conversion of the Fischer-Tropsch synthesis over Fe-Ni/Al 2 O 3 catalyst by using coupled artificial neural networks (ANN) and design of experiment (DOE) approaches were investigated. The variable parameters for modeling consisted of the pressure range between 2 and 10 bar and the temperature range of 523-573 K. After training of data by ANN and determination of DOE points by central composite design (CCD), the results were compiled together for producing simulated data used in the response surface method (RSM). The RSM was used as an applied mathematics model to demonstrate the CO conversion and selectivity of hydrocarbons dependence on the CO hydrogenation conditions. The results indicated that CO conversion and C þ 5 selectivity increased with rising both temperature and pressure. The methane selectivity showed upward trend as the temperature increased. It also increased by decreasing pressure. Finally, the optimization of the catalytic process was carried out and conditions with maximum desired product were obtained. A comparison of experimental values and RSM values show that the RSM equations are able to predict the behavior of experimental data.

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Synthesis new Co–Mn mixed oxide catalyst for the production of light olefins by tuning the catalyst structure

Saheli

Rezvani

Arabshahi

et al. 2020

Applied Organom Chemis

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In order to increase the catalyst activity for Fischer-Tropsch synthesis (FTS), the preparation methods of two new catalysts were studied. The chemically identical bimetallic Co-Mn/Al 2 O 3 catalysts were synthesized by different synthetic methods: (a) via thermal decomposition of the complex [Co 1.33 Mn 0.667 (C 7 H 3 NO 4) 2 (H 2 O) 5 ].2H 2 O (1) and (b) by the impregnation technique. The complex was characterized by the single-crystal analysis, elemental analysis, and Fourier-transform infrared (FT-IR) spectroscopy. Both catalysts were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), Brunauer-Emmett-Teller (BET) specific surface area, hydrogen temperature-programmed reduction (H 2-TPR), and H 2-chemisorption. The catalysts' activity was investigated for the Fischer-Tropsch synthesis in a fixed bed microreactor. Higher activity was obtained for the catalyst prepared by thermal decomposition of the inorganic precursor due to its small particle size, superior dispersion, and higher surface area. The results show that the catalyst prepared thermal decomposition has 21% ethylene, 10% propylene, and 50% C 5 + selectivity, while methane selectivity of this catalyst is 11% at 250 C. On the other hand, the catalyst obtained by the impregnation method displays 15% ethylene, 8% propylene, 29% C 5 + , and 29% methane selectivity at the same temperature.

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Kinetic study of CO hydrogenation over co-precipitated iron–nickel catalyst

Cited by 31 publications

References 43 publications

Kinetics of Fischer–Tropsch Synthesis in a 3-D Printed Stainless Steel Microreactor Using Different Mesoporous Silica Supported Co-Ru Catalysts

Kinetics of Fischer–Tropsch Synthesis in a 3-D Printed Stainless Steel Microreactor Using Different Mesoporous Silica Supported Co-Ru Catalysts

Modeling of liquid hydrocarbon products from syngas

Synthesis new Co–Mn mixed oxide catalyst for the production of light olefins by tuning the catalyst structure

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