Pyrite catalysis in coal liquefaction

Significant liquefaction catalysis by pyrite was observed for both Elkhorn No. 3 and Kentucky No. 9 coals. For both coals conversion and oil yield increased on addition of 10% pyrite to the feed slurry. Oil yields increased from 27.3 to 41.0% for Elkhorn No. 3 and from 15.3 to 34.9% for Kentucky No.9. Gas yields increased slightly for Elkhorn No. 3 and were essentially unchanged for Kentucky No 9. Hydrogen consumption, after correction for the increased hydrogen sulphur make, was likewise favourable. Sulphur contents in the residual SRC material increased in both cases. Solvent hydrogen content remained constant in the presence of pyrite, whereas it decreased significantly in the absence of pyrite. Solvent in the presence of pyrite without any coal present showed little change at process conditions.