INFLUENCE DE L'HYDROGENE ET DES CATALYSEURS SPECIFIQUES SUR LA PRODUCTION DE COMBUSTIBLES LIQUIDES SYNTHETIQUES
Two types of iron catalyst were studied: (i) a very finely divided iron oxide catalyst (0,05 mum) obtained by the thermal decomposition in a flame of a starting (iron) compound (Blow lamp oxides), (ii) an iron hydroxide catalyst with particle size in the micrometre range prepared by precipitation from a laboratory prepared solution or from a solution supplied by industry (industrial oxides). The following general points arose out of the laboratory tests: (i) acidified clays do not present significant and reproducible effects; (ii) the activity of certain iron catalysts, notably the blow lamp and industrial oxides, is comparable to that of the reference catalyst Ni-Mo/A1-20-3. These oxides can be used in very low concentrations + less than or equal to 0.5 % of coal; (iii) the activity of red mud is considerably less, thereby requiring the use of a higher concentration + of the order of 5 % of coal; (iv) Better results are obtained by increasing the partial pressure of hydrogen; (v) While low rank coals are more suited to liquefaction, the use of catalysts and variation of hydrogen partial pressure have a lesser effect in this case. The pilot plant tests have confirmed the activity of iron catalysts in terms of the sustained hydrogenation capability of the recycle solvent, the overall conversion of coal and distribution of useful liquid products. However, the type of catalyst and catalyzer have little effect on the yield of gaseous hydrocarbon products.
Références bibliographiques: EUR 9382 FR (1984) MF, 97 P., BFR 120, BLOW-UP COPY BFR 485, EUROFFICE, LUXEMBOURG, POB 1003
Disponibilité: Can be ordered online
Numéro d'enregistrement: 1989123014700 / Dernière mise à jour le: 1987-01-01
Langues disponibles: fr