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Water, Air, & Soil Pollution

, 229:309 | Cite as

Use of Rh (III)-Heteropolymolybdate as Potential Catalysts for the Removal of Nitrates in Human Drinking Water: Synthesis, Characterisation and Catalytic Performance

  • María A. Jaworski
  • Guillermo R. Bertolini
  • Carmen I. Cabello
  • Guillermo J. Siri
  • Mónica L. Casella
Article

Abstract

The investigation and development of technologies to remediate water contaminated with NO3 are constantly increasing. An economically and potentially effective alternative is based on the catalytic hydrogenation of NO3 to N2. With this objective, bimetallic RhMo6 catalysts based on Anderson-type heteropolyanion (RhMo6O24H6)3− were prepared and characteri3ed in order to obtain well-defined bimetallic catalyst. The catalysts were supported on Al2O3 with different textural properties and on silica. The heteropolyanion-support interaction was analysed by temperature-programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS). The differences obtained in activity and selectivity to the different products can be assigned to the different interaction between the RhMo6 Anderson phase and the supports. The RhMo6/G, (G: γ-Al2O3) system showed the best catalytic performance. This catalyst exhibited the lowest reduction temperature of Rh and Mo in the TPR assay and a Rh/Mo surface ratio similar to that of the original phase, as observed by XPS analysis. These studies allowed us to verify a synergic effect between Rh and Mo, through which Mo reducibility was promoted by the presence of the noble metal. The catalytic activity was favoured by the active sites generated from the Anderson phase. This fact was confirmed by comparing the activity of RhMo6/G with that corresponding to a conventional catalyst prepared through successive impregnation of both Rh (III) and Mo (VI) salts.

Keywords

Nitrate Water pollution Well-defined catalysts Anderson phase Hydrogenation Synergic effect 

Notes

Acknowledgements

We are grateful to Mrs. Graciela Valle, Eng. Edgardo Soto, Lic. Mariela Theiller, Dra. Laura Barbelli and Eng. Hernán Bideberripe for their contribution and technical support.

Funding Information

This study received financial support from the following institutions: CONICET (PIP 0276 and 0003), ANPCyT (PICT 0409) and UNLP (Subsidio Jóvenes Investigadores, Subsidio de Viajes) and Projects I172, X633 y X700; and CICPBA (Project 832/14).

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Centro de Investigación y Desarrollo en Ciencias Aplicadas “Dr. Jorge J. Ronco” (CINDECA), CCT-CONICET La PlataUniversidad Nacional de La Plata and Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA)La PlataArgentina
  2. 2.PIDCAT-Facultad de Ingeniería (UNLP)La PlataArgentina
  3. 3.Miembro CIC, Comisión de Investigaciones Científicas y Técnicas, Provincia de Buenos Aires and Facultad de Ingeniería UNLPLa PlataArgentina

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