Fischer-Tropsch synthesis in the slurry phase on manganese/iron catalysts

Deckwer, W.‐D.; Serpemen, Y.; Rálek, M.; Schmidt, B.

doi:10.1021/i200017a005

Cited by 63 publications

(26 citation statements)

References 7 publications

(12 reference statements)

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“…As in the present study the measured data are evaluated on the basis of appropriate slurry reactor models and the hydrodynamic and mass transfer properties can be estimated with sufficient accuracy from previous investigations (Deckwer et al, 1980(Deckwer et al, , 1981(Deckwer et al, , 1982a, it is thought that a more reasonable measure to characterize activity and reproducibility is the first order rate constant evaluated from the experimental data. However, all these quantities also depend on specific operating conditions and hydrodynamic and mass transfer properties, as well.…”

Section: Data Reproducibilitymentioning

confidence: 99%

“…However, these studies are mainly based on few data points from the RheinpreuBen-Koppers demonstration plant (Kolbel and Ralek, 1980) operated over 30 years ago. Deckwer et al (1982a) studied the FTS on a Mn/Fe catalyst in a bubble column slurry reactor (BCSR) and the experimental results were analysed from the reaction engineering point of view. The earlier work was reviewed by Kolbel and Ralek ( 1980).…”

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confidence: 99%

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Fischer‐tropsch synthesis in bubble column slurry reactors on FE/K‐catalyst

1986

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Fischer-Tropsch synthcsis (FTS) on K promoted Fe catalyst was studied in three bubble column slurry reactors (BCSR) of 2.5. 5 , and 10 cm diameter. The objective was to check data reproducibility under conditions of arbitrary alterations of various parameters. First order rate constants evaluated on the basis of appropriate slurry reactor models were chosen as an approximate measure to characterize data reproducibility and catalyst activity. It was found that rate constants and hence reproducibility may differ by a factor of two if different batches and precipitations of catalyst are considered. Within the parameter ranges covered in this study this rule of thumb is valid irrespective of reactor diameter, type of sparger, catalyst concentration, temperature, pressure, and gas flow rate. The rate constants compare well with literature data.On a ktudi6 la synthkse Fischer-Tropsch sur un catalyseur au Fe active par le K dans trois rkacteurs a colonnes 21 bulles et suspension dont les diamktres Ctaient respectivement 2.5, 5 et 10 cm. L'objectif du travail ktait de vkrifier la reproductibilitk des rksultats dans des conditions de perturbations arbitraires de divers paramktres. On a choisi, comme mesure approximative servant a caractkriser la reproductibilitk des donnCes et I'activitk du catalyseur, des constantes de vitesse de premier ordre kvalukes I'aide de modkles de rkacteurs a suspension appropriks. On a constatk que les constantes de vitesse donc la reproductibilitk peuvent differer d'un facteur 2 , si I'on considkre diffkrents lots du catalyseur. Dans les limites des gammes des parametres couvertes dans la prksente etude, cette rkgle empirique est valable, indkpendamment du diamktre du rkactcur, du type de barboteur, de la concentration du catalyseur, de la temp&ature, de la pression et du dkbit de gaz. Les constantes de vitesse se comparent bien avec celles donnkes dans la littkrature. n the second wave of research on the Fischer-Tropsch

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Section: Data Reproducibilitymentioning

confidence: 99%

mentioning

confidence: 99%

Fischer‐tropsch synthesis in bubble column slurry reactors on FE/K‐catalyst

1986

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“…This observation combined with chemisorption results suggests that the high olefin to paraffin ratios observed for MnO-supported systems are due to metal-support interaction whose effect is limited to reducing the hydrogenation activity of the catalyst. Manganese oxide-containing iron catalysts, which are known for high selectivity to short-chain olefins, have also been found to follow Schulz-Flory distribution by Deckwer et al (1982). They have concluded that the higher yield of Cz to C4 hydrocarbons in Mn/Fe systems is due to the lower value of chain growth probability.…”

Section: ' C L H H Fmentioning

confidence: 99%

Manganese oxide supported cobalt‐nickel catalysts for carbon monoxide hydrogenation

et al. 1985

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Performances of manganese oxide‐supported cobalt, nickel, and their combinations of varying compositions have been investigated for CO hydrogenation to lower hydrocarbons using a fixed bed microreactor at atmospheric pressure and temperatures ranging from 525 to 575 K. While Co/MnO was found to exhibit high selectivity to olefins in the C2–C4 range, the total yield of hydrocarbons was low. Addition of nickel to cobalt gave a stable catalyst having improved hydrocarbon yields while still retaining good olefin selectivity. The effect of operating conditions on product distribution was studied. Lower space times and higher temperatures favored olefin selectivity. A comparison of Ni and Co catalysts on various support materials was made. MnO‐supported Co catalyst gave significantly higher olefin/paraffin ratio than that obtained using conventional supports such as SiO2 or Al2O3. It was found that Co/MnO exhibited high water‐gas shift activity, and suppressed hydrogen uptake due to strong metal‐support interaction which favored olefin formation. This can be explained on the basis of competitive adsorption of water and hydrogen on the same surface sites resulting in low hydrogenation activity but improved olefin selectivity.

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“…Desired compositions of copper-promoted iron-based catalysts were prepared by continuous co-precipitation, using an apparatus and a technique similar to that employed by previous investigators (Kolbel and Ralek, 1980;Deckwer et al, 1982). Unlike conventional batch precipitation, this approach ensures that precipitation occurs at a constant, rather than continuously changing, pH, resulting in much more uniform and predictable particle size and porelstructure.…”

Section: Co -Precipitation Proceduresmentioning

confidence: 99%