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Article
Effect of Gallium Additions on Reduction, Carburization and Fischer–Tropsch Activity of Iron Catalysts
Undoped and gallium-doped iron oxide catalysts (100Fe, 100Fe:2Ga, and 100Fe:5Ga) were prepared by following a continuous co-precipitation technique using ammonium hydroxide as precipitant. The catalysts were c...
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Article
Fischer–Tropsch Synthesis: Deactivation as a Function of Potassium Promoter Loading for Precipitated Iron Catalyst
The effect of potassium promoter loading (0, 0.5, 1.0 and 2.0 atomic ratio) on the performance of precipitated iron catalysts was investigated during Fischer–Tropsch synthesis using a continuously stirred tank...
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Article
Fischer–Tropsch Synthesis: Effect of Activation Gas After Varying Cu Promoter Loading Over K-Promoted Fe-Based Catalyst
The effects of activation gas and copper promoter loading on the Fischer–Tropsch synthesis performance of potassium promoted precipitated iron-based catalysts were investigated using a continuously stirred tan...
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Article
Fischer–Tropsch Synthesis: Effect of Potassium on Activity and Selectivity for Oxide and Carbide Fe Catalysts
The effect of potassium on oxides and carbides of iron for Fischer–Tropsch synthesis (FTS) was investigated by pretreating Fe3O4 and K-promoted Fe catalysts with different gases (H2/H2O and CO). A freshly activat...
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Article
Fischer–Tropsch Synthesis: Effect of Water Over Iron-Based Catalysts
The effect of water on the performance of potassium-promoted precipitated iron catalyst was investigated during Fischer–Tropsch synthesis (FTS) using a continuously stirred tank reactor (CSTR) at two different...
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Article
Fischer–Tropsch Synthesis: Characterization Rb Promoted Iron Catalyst
Rubidium promoted iron Fischer–Tropsch synthesis (FTS) catalysts were prepared with two Rb/Fe atomic ratios (1.44/100 and 5/100) using rubidium nitrate and rubidium carbonate as rubidium precursors. Results of...
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Article
Fischer–Tropsch Synthesis: Morphology, Phase Transformation and Particle Size Growth of Nano-scale Particles
An unpromoted ultrafine iron nano-particle catalyst was used for Fischer–Tropsch synthesis (FTS) in a CSTR at 270 °C, 175 psig, H2/CO = 0.7, and a syngas space velocity of 3.0 sl/h/g Fe. Prior to FTS, the catalys...
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Article
Fischer–Tropsch Synthesis: Changes in Phase and Activity During Use
Four iron catalysts (unpromoted, K-promoted, Si-promoted and K,Si-promoted) were activated and subjected to common Fischer–Tropsch synthesis conditions. At increasing times on stream, samples were withdrawn fr...
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Article
Kinetics of ordering in metallic alloys
Electrical, magnetic, and mechanical properties of metallic alloys depend on their state of chemical order. The systematic perturbations of57Fe hyper-fine magnetic fields by solute atoms near57Fe atoms can be use...