• A. R. Romero UNICAT, Fac. de Química, UNAM, Cd. Universitaria
  • J. Ramírez UNICAT, Fac. de Química, UNAM, Cd. Universitaria
  • L. Cedeño UNICAT, Fac. de Química, UNAM, Cd. Universitaria
Keywords: hydrodesulfurization, niobia-alumina support, sulfurization treatment, temperature-programmed reduction, temperature-programmed sulfiding


Niobium sulfide has been recently found to be an interesting new active phase for hydrodesulfurization. However for conventional supports such as alumina or silica strongly interact with the active cation preventing its sulfurization. In this paper, niobium was used as a dopant of a conventional hydrotreatment catalyst, Mo/Al 2 O 3 . The activation of the catalysts was performed under atmospheric pressure with different H 2 S-based streams: H 2 S/H 2 , and H 2 S/N 2 . Thiophene HDS activity over Mo-Nb/Al 2 O 3 catalyst was increased when it was sulfurated with H 2 S/H 2 at 400°C. The changes in catalytic activity can be associated to a better Mo dispersion due to surface modification. The reduction and sulfidation of Mo species were enhanced by the presence of Nb.


Allali, N., Marie, A., Danot, M., Geantet, C. y Breysse, M. (1995). Carbon-supported and alumina-supported niobium sulfide catalyst. Journal of Catalysis 156, 279-289.

Cedeño L., Zanella R., Ramirez J. y Agudo A. L. (2000). TPR-S and TPS studies of CoMo and NiMo catalysts supported on Al 2 O 3 - TiO 2 mixed oxides. Studies in Surface Science and Catalysis 130, 2807-2812.

Cedeño L., Romero A. y Ramirez J. (2003). Niobium sulfide as a dopant for Mo/TiO 2 catalysts. Catalysis Today 78, 513-518.

Da Silva, C., Zotin, J., Faro, A. y Rocco, M. (1997). Actividade de HDS do tiofeno e HCC do cumeno em catalisadores do Mo suportados em niobia-alumina. Trabalhos
Tecnicos do 9o Congresso Brasileiro De Catalyse 253-260.

Gaborit, V., Allali, N., Geantet, C., Breysse, M., Vrinat, M. y Danot, M. (2000). Niobium sulfide as a dopant for hydrotreating NiMo catalysts. Catalysis Today 57, 267-273.

Jehng, M. y Wachs, I. (1990). Recent catalytic applications of niobium-based materials. Catalysis Today 8, 37-41.

López-Cordero, R., Lazaro, J., García-Fierro, J. y Lopez-Agudo A. (1988). Influencia de la preparación sobre los perfiles RTP y actividad para HDS de catalizadores de
MoO 3 /Al 2 O 3 . Actas del XI Simposio Iberoamericano de Catálisis 3, 563-570.

Passos, F., Aranda, D., Soares, R. y Schmal, M. (1998). Effect of preparation method on the properties of Nb 2 O 5 promoted platinum catalyst. Catalysis Today 43, 3-9.

Schmal, M., Aranda, D., Soares, R., Noronha, F. y Frydam, A. (2000). A study of the promoting effect of noble metal addition on niobia and niobia alumina catalysts.
Catalysis Today 57, 169-176.

Scheffer, B., Dekker, N., Mangnus, P. J. y Moulijn J. A. (1990). A temperature-programmed study of sulfided CoMo/Al 2 O 3 HDS catalysts. Journal of Catalysis 121, 31-46.

Weissman, J.G. (1996). Niobia-alumina supported hydroprocessing catalysts: relationship between activity and support surface acidity. Catalysis Today 28, 159- 166.
How to Cite
R. Romero, A., Ramírez, J., & Cedeño, L. (2020). STUDY OF THE ACTIVATION AND CHARACTERIZATION OF Mo ON Nb MODIFIED ALUMINA CATALYSTS. Revista Mexicana De Ingeniería Química, 2(2), 75-81. Retrieved from