CATALYTIC HYDROTREATMENT OF ILLINOIS NO-6 COAL-DERIVED NAPHTHA - COMPARISON OF MOLYBDENUM NITRIDE AND MOLYBDENUM SULFIDE FOR HETEROATOM REMOVAL

The hydrotreatment of naphtha derived from Illinois No. 6 coal was investigated using molybdenum sulfide and nitride catalysts. The two catalysts are compared on the basis of total catalyst weight. Molybdenum sulfide is more active than molybdenum nitride for hydrodesulfurization (HDS) of a coal-derived naphtha. The rates of hydrodeoxygenation (HDO) of the naphtha over both catalysts are comparable. For hydrodenitrogenation (HDN),the sulfide is more active than the nitride only at higher temperatures (> 325 degrees C). Based upon conversion data, the naphtha can be lumped into a reactive and a less reactive fraction with each following first-order kinetics for heteroatom removal. The HDS and HDN rates and activation energies of the less reactive lump are smaller for the nitride than for the sulfide catalyst.