【摘要】 氮化物和硫化物同时存在于柴油之中。采用硅胶脱除原料中氮化物,得到硫含量相同而氮含量不同的4种柴油原料。为了考察氮化物对加氢脱硫(HDS)的影响,在反应温度350℃、氢分压4.8MPa、液时空速2.0h-1和氢/油体积比300的条件下,采用工业化的NiW/Al2O3催化剂在小型固定床实验装置上对该4种柴油原料进行加氢脱硫实验。结果表明,在真实油品的复杂体系中,氮化物对加氢脱硫反应有明显的抑制作用,加氢脱硫反应速率随着原料中氮含量的增加而降低。分子模拟计算结果表明,氮化物与硫化物在催化剂活性位上发生竞争吸附,氮化物的吸附能力较强,抑制了加氢脱硫反应。更多还原

【Abstract】 Nitrogen- and sulfur- containing compounds co-exist in diesels. Four diesel feeds with same sulfur content and different nitrogen content were prepared by the silica gel to removal of nitrogen-containing compounds. In order to investigate the effect of nitrogen-containing compounds on HDS of diesel, the four feeds were hydrotreated in a pilot plant at 350℃, 4.8 MPa, LHSV of 2.0 h -1 and V（H₂）/V（Oil） of 300 over a commercial NiW/Al₂O₃ catalyst. The results showed that the inhibition effect of nitrogen-containing compounds on HDS was obvious, HDS reaction rate decreased with the increase of nitrogen content. Molecular simulation calculation results showed that there was competitive adsorption between nitrogen-containing compounds and sulfur-containing compounds on catalyst’s active sites, nitrogen-containing compounds inhibited HDS reactions because of their stronger adsorption strength.更多还原