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Showing 1 to 10 of 10 for “"promoted catalysts"”.
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Nuclear magnetic resonance study of promoted catalysts
We have used NMR to study the properties of promoted catalysts prepared by adding alkali metals (Na, K, Rb, or Cs) to silica supported Pt clusters. We have also examined the effect of the alkali metals on CO and C$\sb{2}$H$\sb{4}$ adsorbed on the Pt. The properties of the promoter were studied in …
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Deposition of Au/Pt on Co/SiO 2 for Fischer-Tropsch synthesis
Cobalt Fischer-Tropsch catalysts, which are used when the desired products are long chain, linear waxes and diesel [1], are promoted with noble metals [2].This is to primarily increase the reducibility of the cobalt oxide (Co3O4) phase present in the supported catalyst during preparation but also …
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Kinetic studies of the metathesis of 1-hexene using Re2O7/γ-Al2O3 and the synthesis and metathesis of oxazolines
… the rate of metathesis decreases rapidly. Co-catalysts alter the active sites for metathesis so that the catalyst is more selective to the metathesis of 1-hexene. However, the regeneration of metathesis activity is much worse for promoted catalysts than for the unpromoted. The synthesis and …
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Study of the effects of promoters (MnOx and FeOx) on Co3O4/CeO2 during Preferential Oxidation of Carbon monoxide
… swing adsorption (Park, Lee and Lee, 2009). Catalysts used for CO-PROX are either noble metal or transition metal oxide based. Noble metal-based catalysts have a low CO oxidation activity at temperatures below 200 °C, higher cost, and lower availability when compared to transition metal-based …
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Nuclear magnetic resonance study of promoted catalysis
We have used NMR to study the properties of promoted catalysts prepared by adding alkali metals (Na, K, Rb, or Cs) to silica supported Pt clusters. We have also examined the effect of the alkali metals on CO and C2H4 adsorbed on the Pt. The properties of the promoter were studied in samples con t …
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Interactions of hydrogen with alkali promoted Ru/SiO2 catalysts: a proton NMR study
… has endeavored to characterize alkali promoted Ru/SiO[subscript]2 catalysts. Initial work investigated the role of hydrogen spillover to the silica support on the characterization of the active metal sites via a hydrogen chemisorption technique. A strongly bound component of spilled …
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Vanadia Promoted Co-AI20 3 Fischer-Tropsch Catalysts
… on yAI203 supported cobalt-based Fischer-Tropsch catalysts. The y-Ah03 support was modified by addition of varying amounts of vanadia and was subsequently loaded with the same Co content (10 wt-%). The modified supports and catalysts were characterised using conventional characterisation methods. …
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Novel empowered supports for iron-based Fischer-Tropsch in a power-to-liquids process
… moderate temperatures and pressures. Iron-based catalysts are frequently used in commercial FT as they are quite useful in hydrogen lean synthesis gas because of their high water-gas shift activity. Nevertheless, these catalysts often need to be promoted to optimize their performance and they are …
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DEVELOPMENT OF SUPPORTED COBALT CATALYST FOR FISCHER-TROPSCH SYNTHESIS
… chemicals. Understanding and developing FTS catalysts using mesoporous materials are of main interest in the present work. In the first step, the research focused on developing Co-based catalyst supported on multiwalled carbon nanotubes (MWCNTs). The functionalization of CNTs and its impact …
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Influence of basicity in Fischer-Tropsch synthesis over supported iron-based catalysts
… A draw-back of the currently used iron-based catalysts is their short lifetime, caused by sintering and particle break-up. These disadvantages might be overcome by utilizing a supported iron-based catalyst. However, supported iron Fischer-Tropsch synthesis, which has been tested up to now, …