Abstract:

Behavior and evolution of the hydrocarbon generation from the organic matter in coal under the occurrence of
molybdenum is poorly understood. Thus, a set of the catalytic simulation for the gas generation of the coal sample with addition
of elemental molybdenum was carried out with the gold tube autoclave. It was found that the peaks of total and monomeric
hydrocarbon gas generation occurred whether or not to add molybdenum, which indicates that there is still large potential for
methane generation in very high maturity stage with simulated vitrinite reflectance (SVR) greater than 4.0 percent. Added
molybdenum had a weak suppression on the gas hydrocarbon generation from the coal when the SVR was less than 3.0 percent.
The promotion to a certuin extent occur after the SVR is more than 3.0 percent. Interrelationship of the methane yields between
the raw and molybdenum-added coal samples was similar to that of total gaseous hydrocarbon yield, the ethane yield of the
molybdenum-added sample was higher than that of the raw sample coal once the SVR exceeds to 3.0 percent, and the propane
to pentane yields under the occurrence of molybdenum were slightly higher than or approximately equal to those from the raw
samples after their generation peaks. It was suggested that the added molybdenum was not involved in the early to medium staqes
of the hydrocarbon generation through a thermal degradation, but played a promoting effect on late thermal cracking hydrocarbon

generation, possibly resulting from the differences of the catalytic reaction space during various maturation stages of coal