CARBONIZATION BEHAVIOR OF HYDROTREATED COAL-TAR PITCH CONTAINING FINEMOLYBDENUM AND RUTHENIUM PARTICLES

In the carbonization of hydrotreated coal tar pitch containing fine mo lybdenum and ruthenium particles, a tritium tracer method revealed tha t prior addition of fine molybdenum and ruthenium particles into the p itch can selectively catalyze the condensation of low molecular weight hydrocarbons at temperatures below 600 degrees C. This is because the y prevent the release of those molecules by vaporization and result in an increase in the carbonization yield of coal tar pitch and the hydr ogen content of resultant cokes. The carbonization yield with rutheniu m particles was higher than that with molybdenum particles. Observatio ns by a transmission electron micrograph showed that the ruthenium par ticles (10 nm even at 1000 degrees C) were smaller than molybdenum par ticles and were dispersed uniformly throughout the hydrogenated pitch.