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Relative Activity of Impregnated and Mixed Molybdenum Catalysts for Coal Hydrogenation
Experimental data for coal hydrogenation are presented to show that when a vehicle oil produced from coal is present, coal is hydrogenated to the same conversion whether molybdenum catalyst is impregnated on the coal or intimately mixed with the slurry. Differences in product distribution could be related to the severity of operating conditions. No minimum mixing time was established, but 2 hours was sufficient. Longer periods of mixing, to 14.75 hours, had no effect on the results. The hydrogenation conditions were in the pressure range of 8,500 to 10,000 p.s.i. at 400° to 500° C. Most of the experiments were made in duplicate.
Hydrogenation of New Mexico Coal at Short Residence Time and High Temperature
The Bureau of Mines in cooperation with the El Paso Natural Gas Co. investigated the effect of high temperature and pressure at short residence times on the hydrogenation of a New Mexico coal to gaseous and liquid hydrocarbons. The study was made in a bench-scale semicontinuous unit at pressures of 500 to 6,000 psig, 480° to 1,000° C, and residence times of less than 1 minute to 15 minutes. Ammonium heptamolybdate was impregnated on the coal to furnish 1 percent molybdenum based on maf coal.
