Catalytic properties and crystalline structures of manganese-promoted iron ultrafine particles for liquid-phase hydrogenation of carbon monoxide

Itoh, Hiroyuki; Nagano, Shinya; Takeda, Kohtaro; Kikuchi, Eiichi

doi:10.1016/0926-860x(90)80005-y

Cited by 12 publications

(10 citation statements)

References 10 publications

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“…This is because of the fact that the iron-based catalysts starting from their oxide precursors have experimentally proved to have complex phase transfer during the reduction as well as synthesis operation. 40,[41][42][43][44][45] The controversy in the active sites (or phases) in the FTS system appeals the need for much attention to be paid to the understanding of the FTS mechanism at a deep level; for example, the work for Co or Ru catalysts, for which metal phases are believed to be active phases for FTS, has been considered at even a molecular level with many interesting results achieved, casting an encouraging light on the detailed mechanism understanding. 46 For iron catalysts, however, we expect many more challenges in this direction.…”

Section: Kinetic Modelsmentioning

confidence: 99%

“…46 For iron catalysts, however, we expect many more challenges in this direction. [41][42][43][44][45][46][47][48][49] Here, we will not go into these controversies and instead will use experimental data to fit many possible mechanism-derived kinetic models, which are anyhow expected to reflect the most important points of FTS catalysis and chemistry. Beyond the complexities in the FTS catalysis with iron catalysts, it is generally accepted that reactions in eqs 1-3 can be assumed to take place on two kinds of active sites.…”

Section: Kinetic Modelsmentioning

confidence: 99%

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Detailed Kinetics of Fischer−Tropsch Synthesis on an Industrial Fe−Mn Catalyst

Yang

Liu

Chang

et al. 2003

Ind. Eng. Chem. Res.

139

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The detailed kinetics of the Fischer-Tropsch synthesis over an industrial Fe-Mn catalyst was studied in a continuous integral fixed-bed reactor under the conditions relevant to industrial operations [temperature, 540-600 K; pressure, 1.0-3.0 MPa; H 2 /CO feed ratio, 1.0-3.0; space velocity, (1.6-4.2) × 10 -3 Nm 3 kg of catalyst -1 s -1 ]. Reaction rate equations were derived on the basis of the Langmuir-Hinshelwood-Hougen-Watson type models for the Fischer-Tropsch reactions and the water-gas-shift reaction. Kinetic model candidates were evaluated by the global optimization of kinetic parameters, which were realized by first minimization of multiresponse objective functions with a genetic algorithm approach and second optimization with the conventional Levenberg-Marquardt method. It was found that an alkylidene mechanism based model could produce a good fit of the experimental data. This model shows that the desorption of the products and the insertion of methylene into the metal-alkylidene bond are the ratedetermining steps. The activation energy for olefins formation is 97.37 kJ mol -1 and smaller than that for the paraffin formation (111.48 kJ mol -1 ). In this model, the readsorption and secondary reactions of olefins are taken into account, and deviations of hydrocarbon distribution from the conventional ASF distribution can therefore be quantitatively described. However, the deeper information for the olefin-to-paraffin ratio has not intrinsically been described in the present stage, leaving for the further improvements in models to consider the transportationenhanced readsorption and secondary reaction of olefins more practically in the reactor modeling stage.

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Section: Kinetic Modelsmentioning

confidence: 99%

Section: Kinetic Modelsmentioning

confidence: 99%

Detailed Kinetics of Fischer−Tropsch Synthesis on an Industrial Fe−Mn Catalyst

Yang

Liu

Chang

et al. 2003

Ind. Eng. Chem. Res.

139

View full text Add to dashboard Cite

show abstract

“…On the one hand, the intermediate-1 can be converted to intermediate-2 through hydrogenation and dehydration reaction, 18 and then the intermediate-2 is further converted to alkanes and olens by hydrogenation or dehydrogenation. In the process of CO and H 2 conversion to hydrocarbons, only Co [43][44][45] but also promoted dehydration reaction, [46][47][48] both of which are favorable for the production of hydrocarbons, and thus adding these three catalysts can increase the yield of hydrocarbons. However, the Mn 0.5 Co 0.5 Fe 2 O 4 and Zn 0.5 Co 0.5 Fe 2 O 4 catalysts can decrease the yield of hydrocarbons as compared with the MFe 2 O 4 catalyst.…”

Section: Reaction Pathways Analysismentioning

confidence: 99%

One-pot catalytic conversion of methanol to C6–C21 hydrocarbons over bi-functional MFe₂O₄ (M = Ni, Zn, Mn, Co) catalysts

Lai

Zhang

et al. 2015

RSC Adv.

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“…Iron catalysts promoted with Mn [14][15][16][17][18][19], Zn [20,21], group I alkali and group II alkali earth are discussed elsewhere [22,23].…”

Section: Introductionmentioning

confidence: 99%

Effect of Palladium on Iron Fischer?Tropsch Synthesis Catalysts

Luo¹,

O’Brien²,

Davis³

2004

Catalysis Letters

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Studies were conducted to investigate the effect of Pd on the Fischer-Tropsch Synthesis (FTS) selectivity, activity and kinetics as well as on the water-gas shift activity of an iron catalyst. Two palladium promoted catalysts (Pd0.002/Fe100 and Pd0.005/ Fe100) were prepared from a base Fe100/Si5.1 (atomic ratio) catalyst. Results of FTS over the two palladium promoted catalysts were compared to those obtained from the K/Fe/Si base catalyst and a Cu/K/Fe/Si catalyst. The results indicate that Pd enhanced the FT activity while the selectivity for CO 2 and CH 4 changed little compared to the results for the base catalyst and the Cu promoted catalyst. Palladium promotion had a negative effect on the C 2 -C 4 olefin to paraffin ratio. Pd promotion led to a higher WGS rate than the other two catalysts at high syngas conversions. A higher WGS rate compared to the FTS rate was obtained only for the Pd promoted catalysts. The FTS rate constant for the Pd promoted catalyst is higher than the base catalyst but lower than for the Cu promoted catalyst.

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Catalytic properties and crystalline structures of manganese-promoted iron ultrafine particles for liquid-phase hydrogenation of carbon monoxide

Cited by 12 publications

References 10 publications

Detailed Kinetics of Fischer−Tropsch Synthesis on an Industrial Fe−Mn Catalyst

Detailed Kinetics of Fischer−Tropsch Synthesis on an Industrial Fe−Mn Catalyst

One-pot catalytic conversion of methanol to C6–C21 hydrocarbons over bi-functional MFe₂O₄ (M = Ni, Zn, Mn, Co) catalysts

Effect of Palladium on Iron Fischer?Tropsch Synthesis Catalysts

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Catalytic properties and crystalline structures of manganese-promoted iron ultrafine particles for liquid-phase hydrogenation of carbon monoxide

Cited by 12 publications

References 10 publications

Detailed Kinetics of Fischer−Tropsch Synthesis on an Industrial Fe−Mn Catalyst

Detailed Kinetics of Fischer−Tropsch Synthesis on an Industrial Fe−Mn Catalyst

One-pot catalytic conversion of methanol to C6–C21 hydrocarbons over bi-functional MFe2O4 (M = Ni, Zn, Mn, Co) catalysts

Effect of Palladium on Iron Fischer?Tropsch Synthesis Catalysts

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Product

Resources

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One-pot catalytic conversion of methanol to C6–C21 hydrocarbons over bi-functional MFe₂O₄ (M = Ni, Zn, Mn, Co) catalysts