The effect of water on cobalt Fischer-Tropsch catalysts studied by steady-state isotopic transient kinetic analysis (SSITKA)

Rothaemel, M.; Hanssen, K.F.; Blekkan, Edd A.; Schanke, Dag; Holmén, Anders

doi:10.1016/s0920-5861(97)00041-2

Cited by 66 publications

(36 citation statements)

References 8 publications

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“…Water decreased the reaction ate for all these catalysts. A negative impact on the Fischer-Tropsch activity for cobalt deposited on c-Al 2 O 3 due to addition of water is consistent with previous findings [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. It is known for similar catalysts that water may act as an oxidation agent, producing non-active cobalt.…”

Section: Narrow-pore Catalystssupporting

confidence: 91%

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The Effect of Water on the Activity and Selectivity for γ-Alumina Supported Cobalt Fischer–Tropsch Catalysts with Different Pore Sizes

et al. 2006

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The effect of water on the activity and selectivity for a series of c-Al 2 O 3 supported cobalt Fischer-Tropsch catalysts has been studied in an isothermal fixed-bed reactor at T=483 K, P=20 bar, and H 2 /CO=2.1. The catalysts were produced applying incipient wetness impregnation and consisted of 20 wt.% cobalt and 0.5 wt.% rhenium deposited on c-Al 2 O 3 supports with different pore characteristics. For the narrow-pore catalysts, addition of water corresponding to an inlet partial pressure ratio of P H2 O/P H2 =0.4 reduced the reaction rates. In contrast, for a catalyst with larger pores the same water pressure increased the reaction rates. For all catalysts, water amounts equal to P H2 O/P H2 =0.7 at the reactor inlet suppressed the reaction rates and led to permanent deactivation. The addition of water increased the C 5+ selectivity and decreased the CH 4 selectivity for all catalysts. The pore characteristics seem to determine the effect of water on the rates.

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Section: Narrow-pore Catalystssupporting

confidence: 91%

“…According to Rothaemel et al [10], deactivation is caused by the loss of active sites, whereas the site activity of the remaining sites is unchanged by the water treatment. This indicates that oxidation of exposed cobalt atoms is the main course for the deactivation process.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Water on the Activity and Selectivity for γ-Alumina Supported Cobalt Fischer–Tropsch Catalysts with Different Pore Sizes

et al. 2006

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“…Holmen et al [33] reported that both Co/Al2O3 and Co/Re/Al2O3 exhibited deactivation when exposed to water vapor during the Fischer-Tropsch synthesis. In our work, Ni/Al2O3 might be deactivated in aqueous solution following the deactivation mechanisms of Co/Al2O3 and Co/Re/Al2O3 in Holmen's work, which may contribute to the better performance for the hydrogenation of levulinic acid in dioxane than in water.…”

Section: Catalytic Activity and Stabilitymentioning

confidence: 99%

Hydrogenation of Levulinic Acid over Nickel Catalysts Supported on Aluminum Oxide to Prepare γ-Valerolactone

Dong

2015

Catalysts

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Four types of nickel catalysts supported on aluminum oxide (Ni/Al 2 O 3 ) with different nickel loadings were synthesized using the co-precipitation method and were used for the hydrogenation of levulinic acid (LA) to prepare γ-valerolactone (GVL). The synthesized Ni/Al 2 O 3 catalysts exhibited excellent catalytic activity in dioxane, and the activity of the catalysts was excellent even after being used four times in dioxane. The catalytic activity in dioxane as a solvent was found to be superior to the activity in water. Nitrogen physisorption, X-ray diffraction, and transmission electron microscopy were employed to characterize the fresh and used catalysts. The effects of the nickel loading, temperature, hydrogen pressure, and substrate/catalyst ratio on the catalytic activity were investigated.

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“…For FTS, the use of SSITKA has resulted in an improved understanding on the effect of catalyst properties (promoters [72][73][74][75][76][77][78][79][80][81][82][83], support [84][85][86][87][88][89][90], particle size etc. [91][92][93][94]) and the reaction conditions [95][96][97][98][99][100][101] on the performance. Concerning the mechanism, SSITKA gives the coverage of CO and surface carbon intermediates and the site coverage of H can be estimated.…”

Section: Approaches Of Kinetic Analysis For Ftsmentioning

confidence: 99%

Recent Progresses in Understanding of Co-Based Fischer–Tropsch Catalysis by Means of Transient Kinetic Studies and Theoretical Analysis

Yang

Chen

et al. 2014

Catal Lett

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During the last years it has been an increasing focus on fundamental studies of the Fischer-Tropsch synthesis (FTS). Steady-state isotopic transient kinetic analysis and first principles investigation have proven to be important methods in studying the reaction mechanism of FTS. The present contribution deals with recent progresses in understanding of the F-T mechanism on Co catalysts based on combined DFT calculations, in situ characterization, steady-state isotopic transient kinetic analysis and microkinetics. A brief outlook into future perspectives of the FTS for converting synthesis gas from different carbon sources to fuels and chemicals is also provided.

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The effect of water on cobalt Fischer-Tropsch catalysts studied by steady-state isotopic transient kinetic analysis (SSITKA)

Cited by 66 publications

References 8 publications

The Effect of Water on the Activity and Selectivity for γ-Alumina Supported Cobalt Fischer–Tropsch Catalysts with Different Pore Sizes

The Effect of Water on the Activity and Selectivity for γ-Alumina Supported Cobalt Fischer–Tropsch Catalysts with Different Pore Sizes

Hydrogenation of Levulinic Acid over Nickel Catalysts Supported on Aluminum Oxide to Prepare γ-Valerolactone

Recent Progresses in Understanding of Co-Based Fischer–Tropsch Catalysis by Means of Transient Kinetic Studies and Theoretical Analysis

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