The potential of hydropyrolysis as a route for coal liquefaction
The aims of the project were, firstly, to develop effective dispersed catalysts for hydropyrolysis which can be used in low concentrations to improve significantly tar yield and quality; and secondly, to understand the reaction mechanisms involved and the influence of coal structure and catalyst on tar yields and composition. A wide range of dispersed Mo catalysts in the concentration range of 0.003 -1.0% (Mo, daf coal) were investigated with the aim of achieving as low a loading as possible. Iron catalysts received less attention due to their lower activities in hydropyrolysis compared to direct liquefaction. The noble transition metals, Pd and, to a lesser extent, Rh, were used to help probe the reaction mechanisms involved and to demonstrate the advantages of using ion-exchange rather than impregnation for catalyst preparation. Hydrogenation tests were conducted on some of the most effective catalysts. A broad cross-section of coals and some maceral concentrates were tested in the fixed-bed hydropyrolysis apparatus to determine the effect of coal structure on conversions. To further elucidate the role of the catalyst and the mechanisms involved, volatile release profiles were compared using on-line analysis, the extent of desulphurisation was investigated, and hydropyrolysis and batchwise hydrogenation oils were characterised, with the distributions of biomarker alkane compounds proving to be particularly sensitive to catalytic effects.
Bibliographic Reference: EUR 14264 EN (1992) 49 pp., MF, ECU 4
Record Number: 199210917 / Last updated on: 1994-12-02
Original language: en
Available languages: en