渣油悬浮床加氢分散型Mo催化剂硫化程度的XPS分析

 在渣油悬浮床加氢分散型Mo催化剂前体的硫化过程中，采用X射线光电子能谱法(XPS)分析了催化剂表面的硫化状况，并对XPS谱图进行了拟合处理。结果表明，分散型Mo催化剂前体的硫化主要形成了四配位MoS2晶体。在100℃硫化条件下，分散型Mo催化剂前体硫化产物中，Mo4+约占全部Mo物种的81.62%（摩尔分数），表面Mo活性组分硫化率为68.94%，硫化产物中有效S含量为73.06%（摩尔分数）；在300℃硫化条件下，产物中有效S含量为77.93%，表明在渣油悬浮床加氢工艺过程中，提高反应温度更有利于对分散型Mo催化剂前体的预硫化。

XPS STUDY ON THE SULFURIZATION OF DISPERSED Mo CATALYST FOR SLURRY-BED HYDROPROCESSING OF RESIDUE

The composition of the sulfurized products on the surface of dispersed Mo catalyst was investigated by XPS in the sulfurization of water-soluble molybdate as the precursor of the catalyst for slurry phase hydrocracking of residue. The results indicated that the sulfurized products were mainly composed of MoS2, and when the catalyst was sulfurized at 100℃, the molar fraction of Mo4+ in total Mo species of the sulfurized catalyst was 81.62%, the molar sulfurization rate of Mo in the catalyst was 68.94%, and the molar fraction of S to Mo was 73.06%. It is also observed that the molar fraction of S to Mo was 77.93% when the sulfurization temperature was 300℃, meaning that the sulfurization of water-soluble molybdate could be carried out easier at higher temperature for slurry-bed hydroprocessing of residue.