Naphthalene Hydrogenation Saturation over Ni2P/Al2O3 Catalysts Synthesized by Thermal Decomposition of Hypophosphite

摘要

A series of Ni_(2)P/Al_(2)O_(3) catalysts with different Ni_(2)P loadings were synthesized via thermal decomposition of hypophosphite and employed for naphthalene hydrogenation saturation. Results showed that Ni_(2)P loading greatly affected Ni_(2)P particle size and the number of active sites of the as-synthesized catalysts, which was derived from the variable interaction between POx and Al_(2)O_(3). When the hydrogenation saturation reaction was performed at 300 °C, 4 MPa, a H_(2)/oil volume ratio of 600, and a liquid hourly space velocity (LHSV) of 3 h~(–1), 98% naphthalene conversion and 98% selectivity to decalin were achieved over Ni_(2)P/Al_(2)O_(3) catalysts with 10 wt % Ni_(2)P. The superior naphthalene hydrogenation saturation performance was ascribed to the large specific surface area (169 m~(2)·g~(–1)), small Ni_(2)P particle size (3.8 nm), and the high number of exposed active sites (CO sorption 30 μmol·g~(–1)), which were beneficial to the adsorption and diffusion of the reactant molecules on the catalyst.