Effects of the Support on the Performance and Promotion of (Ni)MoS2Catalysts for Simultaneous Hydrodenitrogenation and Hydrodesulfurization

加氢脱氮 加氢脱硫 二苯并噻吩 催化作用 硫化物 化学 硫黄 色散(光学) 无机化学 有机化学 光学 物理
作者
Oliver Y. Gutiérrez,Srujan Singh,Eva Schachtl,Jeongnam Kim,Elena Kondratieva,Jennifer Hein,Johannes A. Lercher
出处
期刊:ACS Catalysis [American Chemical Society]
卷期号:4 (5): 1487-1499 被引量:177
标识
DOI:10.1021/cs500034d
摘要

MoS2 and Ni-promoted MoS2 catalysts supported on γ-Al2O3, siliceous SBA-15, and Zr- and Ti-modified SBA-15 were explored for the simultaneous hydrodesulfurization (HDS) of dibenzothiophene (DBT) and hydrodenitrogenation (HDN) of o-propylaniline (OPA). In all cases, OPA reacted preferentially via initial hydrogenation, and DBT was converted through direct sulfur removal. HDN and HDS activities of MoS2 catalysts are determined by the dispersion of the sulfide phase. Ni promotion increased its dispersion and activity for DBT HDS and also increased the rate of HDN via enhancing the rate of hydrogenation. On nonpromoted MoS2 catalysts, HDS was strongly inhibited by NH3, and the addition of Ni dramatically reduced this inhibiting effect. The conclusion is that HDS is proportional to the concentration of Mo and Ni on the edges of sulfide particles. In contrast, the direct hydrodenitrogenation of OPA occurs only on accessible Mo cations and, hence, decreases with increasing Ni substitution. The nature of the support influences the dispersion of the nonpromoted catalysts as well as the decoration degree of Ni on the edges of the Ni–Mo–S phase. Furthermore, the acidity of the support influences the acidity of the supported sulfide phase, which may play an important role in HDN.

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