加氢脱硫反应后催化剂βMo2N0.78的研究
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摘要: 在对βMo2N0.78催化剂加氢脱硫催化性能进行考察的基础上，对反应使用后催化剂的组成、结构变化、以及反应后催化剂再处理对活性的影响等几方面进行了研究。结果表明，在噻吩加氢脱硫条件下，βMo2N0.78 催化剂的氮含量下降，表层被硫化，而且钝化过程中产生的氮氧化物被消耗，但体相结构没有发生变化，表现了较强的抗硫化性能；脱硫反应前后催化剂的氢还原处理不能改善催化剂的活性，但预硫化催化剂在反应起始的活性与钝化催化剂在反应稳定时活性相近，加氢脱硫反应后催化剂的再次氮化处理，可以较大程度的恢复催化剂的初始活性。Abstract: βMo2N0.78 as a hydrodesulfurization(HDS) catalyst shows high activity in HDS reaction of sulfurous model compounds, which was reported in previous works. Therefore, the changes of the catalyst composition and structure after HDS reaction and the influences of aftertreatment on HDS catalytic activity were studied in this paper. The XRD results indicate that the bulk structure of βMo2N0.78catalyst is kept unchanged, though the catalyst surface is sulfided and the oxynitride is consumed at HDS condition. And the hydrogen reduction treatment of βMo2N0.78 catalyst before and after HDS reaction can not improve the catalytic activity. Presulfided βMo2N0.78 has a similar HDS activity with that of passivated sample at its stable stage. Second passivation of the catalyst after HDS reaction can recovery the catalytic activity.
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Key words:
- thiophene /
- hydrodesulfurization(HDS) /
- βMo2N0.78 /
- catalyst
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