XPS and ISS characterization of potassium or copper containing Fe/Mn oxide catalysts for Fischer-Tropsch synthesis

Lindner, U.; Papp, H.

doi:10.1016/0169-4332(88)90074-8

Cited by 35 publications

(14 citation statements)

References 42 publications

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“…The increased reduction level is accompanied by an unexpected slight increase in dispersion level. The results obtained are consistent with that reported for Co/MnO [38] and Fe/MnO [39] systems, but difficult to correlate with studies where high Mn loadings were used with unsupported Fe:Co catalysts [40] In an effort to improve the performance of the system, the 0.1% Mn promoted Fe:Co/TiO 2 was reduced at two additional temperatures, i.e. 325 and 350°C.…”

Section: Manganese Promotionsupporting

confidence: 88%

Effect of K, Mn and Cr on the Fischer–Tropsch Activity of Fe:Co/TiO2 Catalysts

Duvenhage

Coville

2005

Catal Lett

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A range of 5% Fe/5% Co bimetallic catalysts supported on TiO 2 was promoted with 0.1%, 0.5% and 1.0% potassium, chromium and manganese respectively, and their physical properties and Fischer-Tropsch (FT) CO hydrogenation capabilities were evaluated. Low level promotion (0.1% and 0.5%) by K and Cr modestly improved the activity, decreased the selectivity to methane and increased the +C 5 fraction of the FT product while the Mn promoted catalysts retarded activity and reduced selectivity.

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Section: Manganese Promotionsupporting

confidence: 88%

Effect of K, Mn and Cr on the Fischer–Tropsch Activity of Fe:Co/TiO2 Catalysts

Duvenhage

Coville

2005

Catal Lett

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“…X-ray photoelectron spectroscopy (XPS) analysis was performed on a KRATOS AXIS ULTRA photoelectron spectrometer to obtain information on the catalyst surface composition, which gave information on the distribution of Au and Co on the titania support. The binding energies were corrected by setting the oxidic O1s binding energy at 530 eV [11][12][13][14].…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Effect of the addition of Au on Co/TiO2 catalyst for the Fischer–Tropsch reaction

et al. 2007

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The effect of Au doping on a 10%Co/TiO 2 Fischer-Tropsch catalyst has been investigated by varying the amount of Au (0.2-5 wt.%) added to the catalyst. Addition of Au to the 10%Co/TiO 2 system improved the cobalt dispersion on the catalyst surface and shifted the reduction temperature for the cobalt oxides in interaction with the support to lower temperatures. The catalyst activity for FT reaction increased with an increase in Au loading and passed through a maximum in activity at 1 wt.% Au while the methane and light product selectivity monotonically increased with Au loading.

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“…Mn promoter also promotes the formation of amorphous or graphitic carbon and leads to catalyst deactivation [21]. On the other hand, it is found that Mn has some structural promotion and stabilizes the iron-based catalyst [22,23], and the structural promotion also plays an important role in the catalytic performances [24]. When Mn acts at a structural promoter, the chemisorptive properties of the catalyst are affected due to the strong metal support interaction (SMSI) effect, which promotes the transformation of syngas into light olefins [20,21].…”

Section: Introductionmentioning

confidence: 99%

Effect of manganese on a potassium-promoted iron-based Fischer-Tropsch synthesis catalyst

et al. 2007

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The effects of manganese promoter on the reduction-carburization behavior, surface basicity, bulk phase structure and their correlation with Fischer-Tropsch synthesis (FTS) performances have been emphatically studied over a series of spray-dried Fe-Mn-K catalysts with a wide range of Mn incorporation amount. The catalysts were characterized by means of H 2 and CO temperature-programmed reduction (TPR), CO 2 temperature-programmed desorption (TPD), Mo¨ssbauer spectroscopy etc.. The results indicated that small amount of Mn promoter can promote the reduction of the catalyst in H 2 . However, FeO phase formed during reduction is stabilized by MnO phase with the further increase of Mn content, making FeO phase difficult to be reduced in H 2 . The addition of Mn promoter can stabilize the Fe 2+ and Fe 3+ ions, and suppresses the reduction and carburization of the catalyst in syngas and CO. Mn promoter can also enhance the amount of the basic sites and weaken the strength of the basic sites, which possibly come from the reason that the Mn-K interaction is strengthened with the addition of Mn promoter. The change of surface basicity can modify the selectivity of hydrocarbons and olefins, and the change of bulk structure phase derived from the addition of Mn promoter will affect the catalyst activity and run stability. The synergetic effects of the two main factors result in an optimized amount of Mn promoter for the highest catalyst activity and heavy hydrocarbon selectivity in slurry FTS reaction of Fe-Mn-K catalysts.

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XPS and ISS characterization of potassium or copper containing Fe/Mn oxide catalysts for Fischer-Tropsch synthesis

Cited by 35 publications

References 42 publications

Effect of K, Mn and Cr on the Fischer–Tropsch Activity of Fe:Co/TiO2 Catalysts

Effect of K, Mn and Cr on the Fischer–Tropsch Activity of Fe:Co/TiO2 Catalysts

Effect of the addition of Au on Co/TiO2 catalyst for the Fischer–Tropsch reaction

Effect of manganese on a potassium-promoted iron-based Fischer-Tropsch synthesis catalyst

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