57Fe NGR studies on three-stage hydroliquefaction of coals
| Autor: | M. Jamond, P. Bussière, R. Bacaud, H. Charcosset, B. Nickel-Pepin-Donat |
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| Rok vydání: | 1990 |
| Předmět: |
inorganic chemicals
Nuclear and High Energy Physics geology Oxide Mineralogy engineering.material complex mixtures Catalysis chemistry.chemical_compound Phase (matter) Mössbauer spectroscopy otorhinolaryngologic diseases heterocyclic compounds Coal Physical and Theoretical Chemistry Bituminous coal Chemistry business.industry organic chemicals geology.rock_type Liquefaction Condensed Matter Physics Atomic and Molecular Physics and Optics Chemical engineering engineering Pyrite business |
| Zdroj: | Hyperfine Interactions. 52:297-302 |
| ISSN: | 1572-9540 0304-3843 |
| DOI: | 10.1007/bf02395650 |
| Popis: | Iron Mossbauer spectroscopy has been performed on liquefaction residues of two different French coals. In a three-stage liquefaction of high volatile bituminous coal (Freyming), without an added catalyst, the coal pyrite is not entirely converted into pyrrhotites, whereas in the presence of an added catalyst, coal pyrite is totally transformed into more dispersed pyrrhotites than those from the sample without an added catalyst; furthermore, the whole added catalyst precursor is reduced into pyrrhotites. In the case of liquefaction of subbituminous coal (Gardanne), full conversion of coal pyrite into pyrrhotites (even without an added catalyst) occurs. In addition, in the presence of the added catalyst, besides pyrrhotites, FeS is evidenced. When molybdenum-iron oxide is added as a catalyst precursor, no mixed Fe−Mo phase is detected. |
| Databáze: | OpenAIRE |
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