Hydrotreatment of heavy oil from coal liquefaction on Sulfided Ni - W Catalysts

Abstract

Heavy oil (distillation temperature: 320-340 o C) derived from the direct coal liquefaction process using Shengli coal were hydrotreated using sulfided Ni-Mo/Al 2 O 3 , Ni-W/Al 2 O 3 , and Ni-W/SiO 2 catalysts respectively. The sulfided catalysts were characterized by BET, XRD, H 2 -TPR and NH 3 -TPD respectively. The evaluations of the hydrodenitrogenation (HDN) and hydrodearomatization (HDA) properties of heavy oil on the three catalysts were carried out at 400 o C and 5.0 MPa initial H 2 pressure. The W-based catalysts displayed better performances than Mo-based catalysts for the HDN and HDA reactions. Al 2 O 3 supported catalysts were found to have higher catalytic activities than on SiO 2 supported ones. The activities of sulfided catalysts were associated mainly with the nature of active sites, acidity, metal sulfide crystallite size and the amount of the reducible sulfur species of metal sulfide.

Biohydrogenated Diesel from Palm Oil Deoxygenation over Unsupported and γ-Al2O3 Supported Ni–Mo Catalysts

“…From previous studies on the bond strength between metal and oxygen atoms of the support, Al 2 O 3 was found to have a low metal–oxygen bond energy due to Al 2 O 3 containing a lot of Lewis acid sites . Previous work on heavy oil HDO using different supported Ni catalysts revealed that the Ni–Mo/Al 2 O 3 catalysis was due to the relative abundance of the medium and weak acid sites at 14% and 74%, respectively, while the Ni–W/SiO 2 and Ni–W/Al 2 O 3 catalysts had an increased amount of strong acid sites at 10% and 23%, respectively …”