INTERACTIVE CHEMISTRY OF COAL OIL REACTIONS USING MODEL SYSTEMS

The interactive chemistry in the coprocessing of coal with petroleum residuum was investigated by using simultaneous reactions of model species representative of those present in coal and petroleum residuum. The catalyst used was a sulfur-insensitive MoS2 generated in situ from molybdenum naphthenate and excess sulfur. In the thermal reactions, excess sulfur enhanced the extent of hydrogenation of each reactant. Only small interactive effects were observed in the thermal hydrogenation of reactants combined with and without excess sulfur. In the catalytic reactions, organic nitrogen compounds including quinoline, indole, and pyridine severely deactivated the molybdenum sulfide catalyst and inhibited hydrogenation and removal of oxygen and nitrogen. Both excess elemental sulfur and organic sulfur compounds alleviated catalyst poisoning by nitrogen compounds but inhibited deoxygenation of organic oxygen species. © 1990, American Chemical Society. All rights reserved.