EFFECT OF CHELATING AGENT ON HDS SELECTIVITY OF CoMo CATALYST

Abstract

Abstract: A series of CoMo/ZSM-5-Al2O3 HDS catalysts was prepared with different chelating agents, such as citric acid, nitrilotriacetic acid, ethylene diamine tetraacetic acid and trans-1,2-cyclohexanediamine-N,N,N',N'-tetraacetic acid and characterized by FT-IR, H2-TPR, HRTEM, 27Al NMR and XPS techniques. The effect of the chelating agents on the HDS selectivity was investigated. The results showed that the agents preferentially complexed with Co and Al in the carrier and reduce the reduction temperature of metal components, improve the sulfurization degree of Mo, and increase the number of active center of the catalyst. The use of chelating agent increases the number of stacking layer and the length of MoS2 lamella. The number of stacking layer played a dominant role in promoting desulfurization, resulting in a greater increase in desulfurization activity of the modified catalyst than that in olefin saturation.

Key words: chelating agent, CoMo catalyst, olefin hydrogenation, hydrodesulfurization, selectivity

CLC Number:

References

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