Abstract
Hydrotreatment of Yallourn coal liquid (b .p.180-240°C) was carried out using Co-Mo/Al2O3 and Ni-Mo/Al2O3 catalysts in a fixed bed flow reactor. Principal components in the feedstock are alkyl-phenols (34 .4wt%), alkyl-tetralins (23.8 wt%) and alkyl-naphthalenes (17.7wt%) and paraffins (9.8wt%) of carbon numbers from 8 to 17. Deoxygenation of phenol derivatives proceeds effectively with increasing a reaction temperature, a contact time and a hydrogen pressure . Products are substituted benzenes and cyclohexanes. Larger amounts of substituted cyclohexanes were obtained with Ni-Mo catalyst, indicating higher capability of hydrogenation of this catalyst. Alkyl-naphthalenes decreased with increasing severity of the reaction conditions, promoting dealkylation and hydrogenation reaction. Alkyl-tetralins increased slightly with an increase in the reaction temperature due to the hydrogenation of naphthalenes, and then decreased at 400°C to give alkyl-benzenes . In the temperature range of 280°C to 360°C deoxygenation of phenols proceeded more effectively with the Co-Mo catalyst, and hydrogenation of aromatic rings effectively occurred with Ni-Mo catalyst.
