Reducibility of Cobalt Species in Silica-Supported Fischer–Tropsch Catalysts

Khodakov, Andreï Y.; Lynch, John P.; Bazin, Dominique; Rebours, B.; Zanier, N.; Moisson, B.; Chaumette, P.

doi:10.1006/jcat.1997.1573

Cited by 323 publications

(193 citation statements)

References 32 publications

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“…Note that the reduction of transition metal oxides often involves several steps, e.g. the reduction of Co 3 O 4 to cobalt metallic phases usually proceeds via intermediate formation of CoO [99][100][101]. Thus, the attribution of hydrogen consumption peaks to different metal oxide reduction steps is often arbitrary in TPR experiments [102] and should always be confirmed by additional experimental evidence.…”

Section: Comparison Of Magnetic Methods and Other Techniques Of Catalmentioning

confidence: 99%

Magnetic Characterization of Fischer-Tropsch Catalysts

Чернавский

Dalmon

Перов

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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Résumé -La caractérisation par la méthode magnétique des catalyseurs Fischer-TropschCet article passe en revue les développements récents dans le domaine de la caractérisation des catalyseurs Fischer-Tropsch à base de cobalt, de fer et de nickel par la méthode magnétique. La caractérisation magnétique fournit des informations précieuses sur la réduction du catalyseur, la taille des nanoparticules ferromagnétiques, la chimisorption, ainsi que sur les réactions topochimiques qui se produisent avec les catalyseurs au cours de la genèse de la phase active et dans des conditions réactionnelles. Les possibilités et les limites de la méthode magnétique sont examinées. Abstract -Magnetic Characterization of Fischer-Tropsch Catalysts -This paper reviews recent developments in the application of magnetic methods for investigation of Fischer

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Section: Comparison Of Magnetic Methods and Other Techniques Of Catalmentioning

confidence: 99%

Magnetic Characterization of Fischer-Tropsch Catalysts

Чернавский

Dalmon

Перов

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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“…The moduli of the Fourier transforms of EXAFS data and structural data for reference compounds Co foil, Co 3 O 4 and CoO are shown in Figure 1 and in Table 2, respectively. TABLE 2 Inter-atomic distances (R) and coordination numbers (N) for reference compounds [12,13]. For this reason, we fitted them with single shell parameters assuming that the shell contains disorder, i.e.…”

Section: Catalyst Characterisationmentioning

confidence: 99%

Structural Modification of Cobalt Catalysts: Effect of Wetting Studied by X-Ray and Infrared Techniques

Khodakov

Ducreux

Lynch

et al. 1999

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Modifications structurales de catalyseurs à base de cobalt : étude par rayons X et infrarouges de l'effet de mouillage par l'eau -L'effet de mouillage par l'eau sur la structure et sur la localisation des formes de cobalt sur différents supports (Al 2 O 3 , SiO 2 , TiO 2 , HZSM-5 zéolithe) a été étudié par diffraction des rayons X, spectroscopie infrarouge à transformée de Fourier de CO adsorbé, spectroscopie de photoélectrons X et analyse de la structure fine de seuils d'absorption X. Pour des catalyseurs à base de cobalt préalablement réduits et passivés, le mouillage par l'eau, même en l'absence d'élément promoteur, résulte en une réduction substantielle de la concentration de phases cristallines contenant du cobalt ainsi qu'en une modification des sites de surface. La diminution de la concentration en Co 3 O 4 sous forme cristallisée est particulièrement importante sur des catalyseurs préparés par imprégnation de cobalt sur la silice et sur un mélange de Co 3 O 4 et de zéolithe HZSM-5. La saturation en eau d'un échantillon Co/SiO 2 passivé conduit à un solide amorphe dont la structure locale s'apparente à Co 2 SiO 4 . Pour les catalyseurs Co/Al 2 O 3 and Co/TiO 2 , l'effet du mouillage sur la concentration de Co 3 O 4 sous forme cristallisée est relativement faible.Mots-clés : Fischer-Tropsch, cobalt, eau, redispersion, silicate. Abstract -Structural Modification of Cobalt Catalysts: Effect of Wetting Studied by X-Ray and

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“…Undoubtedly, the advantage of this process is a possibility to the pure types of fuel production without any sulfur and nitrogen compounds [1,2]. F-T synthesis is a well known process starting from 1920s and today increasing interest of usage is observed to obtain alternative feedstock of hydrocarbons such us fuels and waxes [3][4][5][6].…”

mentioning

confidence: 99%

Fischer–Tropsch synthesis over various Fe/Al2O3–Cr2O3 catalysts

Mierczyński

Dawid

Maniukiewicz

et al. 2018

Reac Kinet Mech Cat

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Monometallic iron supported catalysts were prepared by the impregnation method and tested in Fischer-Tropsch (F-T) synthesis. The activity tests performed in the studied reaction showed that the composition of the catalyst strongly influences the reactivity of the catalytic systems in the F-T reaction. It was also found that the system which showed the highest content of iron species on the catalyst surface exhibited the highest yield in F-T reaction. In addition, the most active catalyst also showed high specific surface area, high total acidity value and the highest amount of iron species on the catalyst surface. The analysis of the liquid product of F-T synthesis confirmed the occurrence of aliphatic, branched and unsaturated linear hydrocarbons.

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Reducibility of Cobalt Species in Silica-Supported Fischer–Tropsch Catalysts

Cited by 323 publications

References 32 publications

Magnetic Characterization of Fischer-Tropsch Catalysts

Magnetic Characterization of Fischer-Tropsch Catalysts

Structural Modification of Cobalt Catalysts: Effect of Wetting Studied by X-Ray and Infrared Techniques

Fischer–Tropsch synthesis over various Fe/Al2O3–Cr2O3 catalysts

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