Synthetic doped amorphous ferrihydrite for the fischer – tropsch synthesis of alternative fuels / Bali, Sumit in Industrial & engineering chemistry research, Vol. 51 N° 12 (Mars 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 12 (Mars 2012) . - pp. 4515–4522 Titre : Synthetic doped amorphous ferrihydrite for the fischer – tropsch synthesis of alternative fuels Type de document : texte imprimé Auteurs : Bali, Sumit, Auteur ; Garima Bali, Auteur ; Frank E. Huggins, Auteur Année de publication : 2012 Article en page(s) : pp. 4515–4522 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ferrihydrites Oxyhydroxide minerals Résumé : Ferrihydrites (FHYDs) with the general formula of FeOOH·nH2O are naturally occurring oxyhydroxide minerals found in environments varying from river beds, lakes, and marshes to even living organisms. Here, we report the synthesis of a new kind of synthetic doped amorphous two-line FHYDs containing aluminum and copper, which are not usually known to be found in nature. Transmission electron microscopy carried out on synthetic FHYDs showed them to be amorphous in nature with some nanosized groupings in the form of nanoclusters of about 50–200 nm size without any hint of diffraction fringes associated with crystalline order. The synthetic doped FHYDs exhibit unique properties and have been characterized extensively by magnetic measurements, X-ray diffraction, and electron microscopy as well as by Mössbauer spectroscopic studies. After promotion with potassium, these FHYDs were found to have high activity as catalysts for the Fischer–Tropsch (F–T) conversion of syngas to liquid fuels over a period of 100 h in a fixed bed reactor at 265 °C and 100 psig pressures. The comparison of the preliminary 100 h data for the synthetic doped FHYD catalyst with those of a commercial fixed-bed catalyst pretreated under similar conditions suggests somewhat better catalytic activity of the synthetic doped FHYD than that of the commercial fixed-bed catalyst. The F–T oil and wax obtained as products were characterized extensively using gas chromatography, quantitative 13C NMR, and distortionless enhancement by polarization transfer NMR. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200777v [article] Synthetic doped amorphous ferrihydrite for the fischer – tropsch synthesis of alternative fuels [texte imprimé] / Bali, Sumit, Auteur ; Garima Bali, Auteur ; Frank E. Huggins, Auteur . - 2012 . - pp. 4515–4522. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 12 (Mars 2012) . - pp. 4515–4522 Mots-clés : Ferrihydrites Oxyhydroxide minerals Résumé : Ferrihydrites (FHYDs) with the general formula of FeOOH·nH2O are naturally occurring oxyhydroxide minerals found in environments varying from river beds, lakes, and marshes to even living organisms. Here, we report the synthesis of a new kind of synthetic doped amorphous two-line FHYDs containing aluminum and copper, which are not usually known to be found in nature. Transmission electron microscopy carried out on synthetic FHYDs showed them to be amorphous in nature with some nanosized groupings in the form of nanoclusters of about 50–200 nm size without any hint of diffraction fringes associated with crystalline order. The synthetic doped FHYDs exhibit unique properties and have been characterized extensively by magnetic measurements, X-ray diffraction, and electron microscopy as well as by Mössbauer spectroscopic studies. After promotion with potassium, these FHYDs were found to have high activity as catalysts for the Fischer–Tropsch (F–T) conversion of syngas to liquid fuels over a period of 100 h in a fixed bed reactor at 265 °C and 100 psig pressures. The comparison of the preliminary 100 h data for the synthetic doped FHYD catalyst with those of a commercial fixed-bed catalyst pretreated under similar conditions suggests somewhat better catalytic activity of the synthetic doped FHYD than that of the commercial fixed-bed catalyst. The F–T oil and wax obtained as products were characterized extensively using gas chromatography, quantitative 13C NMR, and distortionless enhancement by polarization transfer NMR. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200777v

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