Isotopic Transient Study of La Promotion of Co/Al2O3or CO Hydrogenation

Vada, S.; Chen, Bin; Goodwin, James G.

doi:10.1006/jcat.1995.1125

Cited by 59 publications

(33 citation statements)

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“…However, upon MnO addition, an increase in residence time and coverage of CH x intermediates was observed with increasing Mn/Co ratio, which is in line with findings by Vada et al using LaO x promotion for a Co/Al 2 O 3 catalyst [40]. At the same time, both a decrease in the residence time and amount of reversibly adsorbed CO was observed.…”

Section: Ssitkasupporting

confidence: 90%

A Highly Active and Selective Manganese Oxide Promoted Cobalt-on-Silica Fischer–Tropsch Catalyst

et al. 2011

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A highly active and selective manganese oxidepromoted silica-supported cobalt catalyst for the FischerTropsch reaction is reported. Co/MnO/SiO 2 catalysts were prepared via impregnation of a cobalt nitrate and manganese nitrate precursor, followed by drying and calcination in an NO/He flow. The catalysts were studied with STEM-EELS, infrared spectroscopy measurements of adsorbed CO and Steady-State Isotopic Transient Kinetic Analysis experiments. Based on those experiments, a relation between C 5? -selectivity and surface-coverages of CH xintermediates on cobalt was found.

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Section: Ssitkasupporting

confidence: 90%

A Highly Active and Selective Manganese Oxide Promoted Cobalt-on-Silica Fischer–Tropsch Catalyst

et al. 2011

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“…The coverage of metallic cobalt crystallites with these oxides may result in a chemical promotion of the active metal as visualized, e.g. using CO-TPD [75,78], XPS [75], and transient kinetic studies [71]. This may lead to higher turn-over frequencies, but will only result in a higher catalytic activity if the increase in the turn-over frequency is not off-set by the decrease in the active metal surface area with the covering metal oxide.…”

Section: Fementioning

confidence: 98%

“…1). These oxides may cover the catalytically active cobalt metal surface [71,[75][76][77][80][81][82] resulting in a decrease in the total metal surface area. The coverage of metallic cobalt crystallites with these oxides may result in a chemical promotion of the active metal as visualized, e.g.…”

Section: Fementioning

confidence: 99%

Fischer‐Tropsch Catalysts for the Biomass‐to‐Liquid (BTL)‐Process

2008

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The Fischer-Tropsch synthesis is at the heart of the Biomass-to-Liquids (BTL) process. Feasibility studies published in open literature typically consider cobaltbased catalysts for the Fischer-Tropsch synthesis. Here, we present an overview on the history and development up until the present for both cobalt-and ironbased Fischer-Tropsch catalysts. The role of the support material and various other additives to the catalyst formulation are discussed in detail with regard to activity, catalyst deactivation, and selectivity. Tentative explanations for e.g. the observed size dependency in cobalt-based catalysts and phase transformations in iron-based Fischer-Tropsch catalysts are offered. The productivity of cobalt-based catalysts at high conversion level is currently higher than that of iron-based catalysts. Nevertheless, it is argued that iron-based catalysts may be an attractive option for the BTL-process, since it is much cheaper, impacting on the cost of the process due to inevitable process set-ups in industrial operation. Improvement of current iron-based catalysts is however desired.

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“…Issues explored using SSITKA have included among others the study of mechanisms, the presence and implications of site heterogeneity, the role of chemical promoters and the effect of operation conditions on the surface coverage of intermediates. 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.…”

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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Isotopic Transient Study of La Promotion of Co/Al2O3or CO Hydrogenation

Cited by 59 publications

References 0 publications

A Highly Active and Selective Manganese Oxide Promoted Cobalt-on-Silica Fischer–Tropsch Catalyst

A Highly Active and Selective Manganese Oxide Promoted Cobalt-on-Silica Fischer–Tropsch Catalyst

Fischer‐Tropsch Catalysts for the Biomass‐to‐Liquid (BTL)‐Process

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

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