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NiMo/MCM-41 Catalysts for the Hydrotreatment of Polychlorinated Biphenyls

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Abstract

MCM-41 type mesoporous materials of pure silicon and aluminosilicates (with Si/Al atomic ratios of 20 and 40) were prepared by a facile synthesis method and used to support NiMo catalysts. Characterization by XRD showed typical patterns of this type of mesoporous solids with a partial collapse of the structure on increasing Al content. In addition, signals attributed to the formation of MoO3, NiO and Al2(MoO4)3 in the transition-metal containing catalysts were observed. The 29Si-NMR-MAS spectra showed that local arrangement of the Si–O–Si bonds was regular, independently of the solid being pure or modified with Al, while the 27Al-MAS-NMR spectra of the aluminosilicates showed both structural and non-reticular species. The N2 adsorption–desorption curves showed type IV isotherms, with considerable diminution in the BET areas once the metals were incorporated. The catalytic results in thiophene hydrodesulfurization (HDS) and polychlorinated biphenyl hydrodechlorination (HDCl) revealed a considerable catalytic activity for all prepared catalysts as compared with a commercial NiMo/Al2O3 one, being highest in the case of the NiMo/Al-MCM-41(40) one for HDS, and for NiMo/Al-MCM-41(20) in HDCl. The excellent properties for HDCl can be attributed to good dispersion of Ni and Mo active phases and to the bifunctional character of the catalysts, namely, to the participation of both coordinatively unsaturated sites of the NiMoS active phase and Brønsted acid sites of the support.

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Acknowledgments

The authors would like to acknowledge financial support by FONACIT through Projects S1-2002000447 and G-2005000444, as well as the fine technical assistance of Pablo Quiroz and Oscar Zorrilla (XRD) from PDVSA-El Chaure, and of Sara Pekerar (MAS-NMR), Mary Labady (ASAP) and Yraida Diaz (HDS) from IVIC.

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Authors and Affiliations

  1. Laboratorio de Fisicoquímica de Superficies, Centro de Química, Instituto Venezolano de Investigaciones Científicas, Apartado 20632, Caracas, 1020, Venezuela

    Franklin J. Méndez, Paulino Betancourt & Joaquín L. Brito

  2. Laboratorio de Química de Superfícies, Departamento de Química, Universidad de Oriente, Cumaná, Venezuela

    Ernesto Bastardo-González

  3. Laboratorio de Tratamiento Catalítico de Efluentes, Centro de Catálisis, Petróleo y Petroquímica, Universidad Central de Venezuela, Caracas, Venezuela

    Paulino Betancourt & Luis Paiva

Authors
  1. Franklin J. Méndez
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  2. Ernesto Bastardo-González
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  3. Paulino Betancourt
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  4. Luis Paiva
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  5. Joaquín L. Brito
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Corresponding authors

Correspondence to Ernesto Bastardo-González, Paulino Betancourt or Joaquín L. Brito.

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Méndez, F.J., Bastardo-González, E., Betancourt, P. et al. NiMo/MCM-41 Catalysts for the Hydrotreatment of Polychlorinated Biphenyls. Catal Lett 143, 93–100 (2013). https://doi.org/10.1007/s10562-012-0933-y

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  • DOI: https://doi.org/10.1007/s10562-012-0933-y

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