Cobalt dispersion, reducibility, and surface sites in promoted silica-supported Fischer–Tropsch catalysts

Girardon, Jean‐Sébastien; Quinet, E.; Griboval-Constant, Anne; Чернавский, П. А.; Gengembre, L.; Khodakov, Andreï Y.

doi:10.1016/j.jcat.2007.03.002

Cited by 189 publications

(115 citation statements)

References 41 publications

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“…Mauldin et al [25] reported that rhenium promotion increased cobalt oxide dispersion during preparation of Co/TiO 2 supported catalysts. Our previous report [45] also indicates that the presence of noble metals (Ru, Re) enhances cobalt oxide dispersion in silica supported catalysts. One of the reasons responsible of higher cobalt oxide dispersion in the catalysts promoted with noble metals could be related to a higher concentration of cobalt oxide nucleation and crystallization sites.…”

Section: Cobalt Dispersionmentioning

confidence: 77%

Promotion of Cobalt Fischer-Tropsch Catalysts with Noble Metals: a Review

Diehl¹,

Khodakov²

2008

Oil & Gas Science and Technology - Rev. IFP

167

109

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Résumé-Promotion par les métaux nobles de catalyseurs Fischer-Tropsch à base de cobalt : une revue -La synthèse Fischer-Tropsch est une part essentielle du procédé XTL (X-To-Liquids, avec X = Gaz, Biomasse ou Charbon) qui convertit du gaz de synthèse en hydrocarbures pour carburants propres. Les catalyseurs à base de cobalt supportés sur des oxydes inorganiques constituent le meilleur compromis pour la production de paraffines à longues chaînes carbonées et de cires. L'efficacité du procédé FischerTropsch dépend très fortement de la performance du catalyseur à base de cobalt. La promotion de ce catalyseur par des métaux précieux peut très fortement améliorer ses performances. Cet article fait la revue des différents effets des métaux nobles sur la structure et la performance de catalyseurs à base de cobalt. Les impacts sur le coût et l'activité des catalyseurs apparaissent comme des éléments incontournables dans le design de catalyseurs performants pour la synthèse Fischer-Tropsch. (X-To-Liquids, with X = Gas, Biomass or Coal) Abstract -Promotion of Cobalt Fischer-Tropsch Catalysts with Noble Metals: a Review -FischerTropsch synthesis is a major part of XTL

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Section: Cobalt Dispersionmentioning

confidence: 77%

Promotion of Cobalt Fischer-Tropsch Catalysts with Noble Metals: a Review

Diehl¹,

Khodakov²

2008

Oil & Gas Science and Technology - Rev. IFP

167

109

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“…The incipient wetness occurs when all pores of the support are filled with the liquid and there is no excess moisture, over and above the liquid required to fill the pores. Our previous works [15,16] have shown that cobalt deposition on silica or alumina using aqueous incipient wetness impregnation with cobalt nitrate results in formation of mononuclear cobalt complexes. Figure 1 displays data obtained by Xray absorption spectroscopy for impregnated and dried cobalt alumina and silica supported catalysts.…”

Section: Structure Of Cobalt Species In Impregnated Catalystsmentioning

confidence: 99%

Enhancing cobalt dispersion in supported Fischer-Tropsch catalysts via controlled decomposition of cobalt precursors

Khodakov¹

2009

Braz. J. Phys.

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Fischer-Tropsch synthesis is a part of Gas-to Liquids (GTL), Biomass-to-Liquids (BTL) and Coal to Liquids (CTL) technologies, which produce alternatives clean fuels from natural gas, biomass and coal. The catalytic performance of cobalt catalysts in Fischer-Tropsch synthesis strongly depends on the size of cobalt particles in nanoscale range (6-30 nm). Cobalt catalysts are usually prepared via incipient wetness impregnation using cobalt salts (cobalt precursors). Catalyst preparation involves several important steps. The paper shows that decomposition of cobalt precursors is often a crucial step in the catalyst design; slower rate of decomposition of cobalt precursors favors smaller size of cobalt particles, higher cobalt dispersion and enhances catalytic performance in Fischer-Tropsch synthesis.

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“…Active sites in cobalt based catalysts are cobalt metal nanoparticles and several studies have shown positive correlations between cobalt dispersion and FTS activity and hydrocarbon selectivity (Iglesia, 1997;Girardon et al, 2007). Thus, maximizing cobalt dispersion on the support is a key objective in the design of Co-based catalysts (Khodakov, 2009).…”

Section: Introductionmentioning

confidence: 99%