Promoting Effect of TiO2 on the Hydrodenitrogenation Performance of Nickel Phosphide

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• 作者：Xiang Li ; Mohong Lu ; Anjie Wang ; Chunshan Song ; Yongkang Hu
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：October 23, 2008
• 年：2008
• 卷：112
• 期：42
• 页码：16584-16592
• 全文大小：270K
• 年卷期：v.112,no.42(October 23, 2008)
• ISSN：1932-7455

文摘

TiO₂-containing bulk Ni₂P catalysts (Ti_x-Ni₂P) were prepared by coprecipitation and in situ H₂ temperature-programmed reduction (TPR), and characterized by XRD, CO chemisorption, TEM, XPS, TPR, and NH₃-TPD. Their hydrodenitrogenation performances were studied by using quinoline and decahydroquinoline (DHQ) as the model molecules. Both the hydrogenation and C−N bond cleavage activities of Ni₂P were improved by the introduction of TiO₂. The TiO₂ species were mainly located separately on the surface of the catalysts and had strong interactions with surface Ni and P species. The reducibility of the precursors as well as the surface electronic properties of Ni₂P catalysts were affected by the addition of TiO₂. Ti_x-Ni₂P showed higher CO uptake but less acid sites than Ni₂P. The promoting effect of TiO₂ was discussed by considering the electronic interactions between surface Ti and Ni₂P species and changes in the adsorption geometries of quinoline, DHQ, as well as the partially hydrogenated intermediates over Ti_x-Ni₂P.