摘要
Abstract
A NiMo catalyst with y-AI2O3 as the support was modified by adding different kinds of silica, namely amorphous silica hydrate with high specific surface area, aerogel silica with high pore volume and silica powder with low specific surface area. The modified catalysts were characterized by means of SEM, TG, XRD, BET, TEM, NH3-TPD and UV-Vis DRS. The catalyst activity in the hydrodesulfurization of dibenzothiophene(DBT)-n-octane system or atmospheric straight-run diesel oil was evaluated. The results showed that adding amorphous silica hydrate could weaken the interaction between the support and the active components, improve the surficial acidity of the catalysts, and form appropriate active centers for the hydrodesulfurization and larger mesopore than 20 nm. The outlet sulfur concentration was 3.00 × 10-5(w) under the conditions of DBT-n-octane as the experimental system, the initial sulfur concentration 4.00 × l0-3(w), reaction temperature 300 ℃, LHSV3.0h-1, hydrogen pressure 2.5 MPa and the ratio of hydrogen to oil 200. For the atmospheric straight-run diesel oil with an initial sulfur concentration 1.05 × 10-3(w), under the conditions of reaction temperature 350 ℃, LHSV 1.8 h-1, hydrogen pressure 2.6 MPa and the ratio of hydrogen to oil 200, the outlet sulfur concentration was 3.48 × 10-5(w).关键词
氧化硅/改性镍-钼催化剂/加氢脱硫/柴油Key words
silica/ modified NiMo catalyst/ hydrodesulfurization/ diesel oil分类
化学化工
