芳烃对柴油超深度加氢脱硫的影响

察了芳烃对柴油超深度加氢脱硫（HDS）反应的影响。通过在实际油品中添加甲苯和萘，得到硫含量、氮含量和芳烃含量相同，而芳烃类型不同的2种加氢原料，采用NiW/Al2O3和CoMo/Al2O3催化剂分别进行超深度加氢脱硫实验。利用分子模拟技术计算了真实油品中典型的硫化物（DBT和4〖DK〗,6 DMDBT）以及甲苯和萘在NiW/Al2O3和CoMo/Al2O3催化剂表面的吸附热（Ea）。结果表明，由于芳烃与4 MDBT、 4〖DK〗,6 DMDBT类化合物在催化剂上的竞争吸附和吸附能的差异，在NiW/Al2O3和CoMo/Al2O3催化剂催化作用下，双环芳烃对柴油超深度加氢脱硫反应的抑制作用均强于单环芳烃；芳烃对以NiW/Al2O3为催化剂的柴油超深度加氢脱硫反应速率的影响强于其对以CoMo/Al2O3为催化剂的柴油超深度加氢脱硫反应速率的影响。

Effect of Aromatics on Ultra Deep HDS for Diesel Oil

The effect of aromatics on diesel ultra deep hydrodesulfurization (HDS) was investigated. Two feed with the same content of the aromatic but different aromatic type for hydrotreating were obtained by adding toluene and naphthalene into real diesel oil, the same contents of sulfur and nitrogen of two feed were also kept. Experiments of ultra deep HDS were carried out in pilot plant over NiW/Al2O3 catalyst and CoMo/Al2O3 catalyst respectively. Adsorption energy (Ea) of typical sulfur compounds (DBT and 4〖DK〗,6 DMDBT) and toluene as well as naphthalene on surface of NiW/Al2O3 and CoMo/Al2O3 were calculated by molecule simulation. The results showed that the inhibition of diaromatic was stronger than that of monoaromatic during the ultra deep HDS over either NiW/Al2O3 or CoMo/Al2O3 catalyst, it also showed that the effect of aromatics on diesel ultra deep HDS reaction velocity over NiW/Al2O3 was stronger than that over CoMo/Al2O3, because of competitive adsorption and adsorption energy differences between aromatic and refractory sulfur species such as 4 MDBT and 4〖DK〗,6 DMDBT on surface of catalyst.