关键词: 硫化, 钼/活性炭催化剂, 活性相

Abstract: Activated carbon supported molybdenum-based catalyst (Mo/AC) is a novel catalyst for hydroprocessing of residuum，and the sulfidation degree determines the activity and stability of catalyst. The sulfurization behavior of Mo/AC was studied. The sulfided catalyst was characterized by means of XRD，XPS，SEM and TEM. Under the following conditions：CS2 as sulfiding agent，n-hexadecane as sulfiding medium，sulfiding temperature 350℃，sulfiding time 3 h，partial pressure of H2 6 MPa，the sulfidation degree of sulfided catalyst was up to 85%. Multilayered MoS2 phase was highly dispersed，with stacking structure of 4～6 layers and length of slabs 6～10 nm. Evaluation demonstrated that sulfided catalyst achieved a high level of conversion at high distillate selectivity with low coke yield in atmospheric residuum conversion.

Key words: sulfurization, carbon supported catalyst, active phase