Highly Active Ni2P/Al2O3 HDS Catalyst Prepared by Ligand Stabilization Method

摘要

Ni2P is a novel hydrotreating catalyst with high intrinsic activity, and has been generally synthesized by high temperature reduction techniques. Further increase of catalytic activity and practical application of Ni2P would require even better dispersion of active centers. In this study, a ligand stabilization method in the presence of TOP and TOPO was adopted to prepare monodisperse Ni2P nanocrystals on Al2O3 support. Characterizations were made by BET, CO uptake, TPR, ~(27)Al-NMR, and EXAFS spectroscopy, which revealed that the Ni2P phase remained stable during reaction without the formation of AlPO4 phase. The Ni2P/Al2O3-LP catalyst gave a good and stable activity with a 4,6-DMDBT HDS conversion of 99% at 573 K and 3.1 MPa, which was much higher than the Ni2P/Al2O3-HT catalyst (HDS conversion of 45%) prepared by the conventional temperature-programmed reduction method.