Hostname: page-component-7c8c6479df-94d59 Total loading time: 0 Render date: 2024-03-28T17:30:28.223Z Has data issue: false hasContentIssue false

Nanostructured SBA-15 Materials as Appropriate Supports for Active Hydrodesulfurization Catalysts Prepared from HSiW Heteropolyacid

Published online by Cambridge University Press:  14 December 2012

J.A. Mendoza-Nieto
Affiliation:
Facultad de Química, Departamento de Ingeniería Química, Universidad Nacional Autónoma de México (UNAM), Cd. Universitaria, Coyoacán, México D.F., 04510, México.
K.D. Tejeda-Espinosa
Affiliation:
Facultad de Química, Departamento de Ingeniería Química, Universidad Nacional Autónoma de México (UNAM), Cd. Universitaria, Coyoacán, México D.F., 04510, México.
I. Puente-Lee
Affiliation:
Facultad de Química, Departamento de Ingeniería Química, Universidad Nacional Autónoma de México (UNAM), Cd. Universitaria, Coyoacán, México D.F., 04510, México.
C. Salcedo-Luna
Affiliation:
Facultad de Química, Departamento de Ingeniería Química, Universidad Nacional Autónoma de México (UNAM), Cd. Universitaria, Coyoacán, México D.F., 04510, México.
T. Klimova*
Affiliation:
Facultad de Química, Departamento de Ingeniería Química, Universidad Nacional Autónoma de México (UNAM), Cd. Universitaria, Coyoacán, México D.F., 04510, México.
*
Get access

Abstract

A series of NiW catalysts supported on SBA-15-type materials modified with Al, Ti or Zr were prepared and tested in simultaneous hydrodesulfurization (HDS) of two model compounds: dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). Catalysts were prepared by incipient wetness impregnation of SBA-type materials (pure silica SBA-15, Al-SBA-15, Ti-SBA-15 or Zr-SBA-15) using Keggin-type heteropolyacid H4SiW12O40 as active phase precursor and nickel nitrate. Nominal composition of the catalysts was 19 wt.% of WO3 and 3 wt.% of NiO. The supports and catalysts were characterized by SEM-EDX, N2physisorption, small-angle and powder XRD, UV-Vis DRS, TPR and HRTEM. It was shown that a good dispersion of Al, Ti and Zr species on the SBA-15 surface was reached. The characteristic structure of the SBA-15 support was preserved in all supports and NiW catalysts. Addition of metal atoms (Al, Ti, Zr) on the SBA-15 surface prior to catalysts’ preparation improved dispersion of Ni and W oxide species in calcined catalysts. HRTEM characterization of sulfided catalysts showed that the dispersion of NiW active phase was also better on metal-containing SBA-15 supports than on the pure silica one. All NiW catalysts supported on metal-containing SBA-15 materials showed an outstanding catalytic performance in HDS of both model compounds used (DBT and 4,6-DMDBT). A good correlation was found between the dispersion of sulfided NiW active phase and catalytic activity results. The highest HDS activity was obtained with the NiW catalyst supported on Zr-containing SBA-15 molecular sieve, which makes it a promising catalytic system for ultra-deep hydrodesulfurization of diesel fuel.

Type
Articles
Copyright
Copyright © Materials Research Society 2012

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Stanislaus, A., Marafi, A. and Rana, M.S., Catal. Today 153, 1 (2010).CrossRefGoogle Scholar
Klimova, T., Gutiérrez, O., Lizama, L. and Amezcua, J., Micropor. Mesopor. Mater. 133, 91 (2010).CrossRefGoogle Scholar
Palcheva, R., Spojakina, A., Dimitrov, L. and Jiratova, K., Micropor. Mesopor. Mater. 122, 128 (2009).CrossRefGoogle Scholar
Gutiérrez, O.Y., Fuentes, G.A., Salcedo, C. and Klimova, T., Catal. Today 116, 485 (2006).CrossRefGoogle Scholar
Klimova, T., Reyes, J., Gutiérrez, O. and Lizama, L., Appl. Catal. A: Gen. 335, 159 (2008).CrossRefGoogle Scholar
Lizama, L. and Klimova, T., Appl. Catal. B. 82, 139 (2008).CrossRefGoogle Scholar
Griboval, A., Blanchard, P., Payen, E., Fournier, M. and Dubois, J.L., Catal. Today 45, 277 (1998).CrossRefGoogle Scholar
Pawelec, B., Damyanova, S., Mariscal, R., Fierro, J.L.G., Sobrados, I., Sanz, J. and Petrov, L., J. Catal. 223, 86 (2004).CrossRefGoogle Scholar
Zhao, D., Huo, Q., Feng, J., Chmelka, B.F. and Stucky, G.D., J. Am. Chem. Soc. 120, 6024 (1998).CrossRefGoogle Scholar
Soriano, A., Roquero, P. and Klimova, T., Stud. Surf. Sci. Catal. 175, 525 (2010).CrossRefGoogle Scholar