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The effect of Mo on the catalytic and surface properties of Rh-Mo/ZrO2 catalysts

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Abstract

A series of Rh-Mo/ZrO2 catalysts with fixed Rh and different Mo loadings were prepared and characterized by H2 chemisorption, XRD, TPR, TEM and XPS. The catalysts were studied in two reactions: the hydrogenation of carbon monoxide and the hydrogenation of toluene. The results suggest that the increase in the Mo content produces a partial coverage of the support and the Rh particles. Moreover, at high Mo coverage, an increase of the MoO3 layer thickness is produced. After being treated in hydrogen, the molybdenum oxide remains as slightly reduced particles, while Rh is essentially as Rh0, with only a small contribution of Rh+ species. The Mo promotes the formation of oxygenates in the CO hydrogenation and it does not affect the activity in the hydrogenation of toluene.

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Authors and Affiliations

  1. Departamento de Físico-Química, Facultad de Ciencias Químicas, Universidad de Concepción, Casilla 3-C, Concepción, Chile

    P. Reyes, J. Fernández, I. Concha & G. Pecchi

  2. Instituto de Catálisis y Petroleoquímica, CSIC, Madrid, Spain

    M. López Granados & J. L. G. Fierro

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  1. P. Reyes
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  2. J. Fernández
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  3. I. Concha
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  4. G. Pecchi
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  5. M. López Granados
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  6. J. L. G. Fierro
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Reyes, P., Fernández, J., Concha, I. et al. The effect of Mo on the catalytic and surface properties of Rh-Mo/ZrO2 catalysts. Catal Lett 34, 331–341 (1995). https://doi.org/10.1007/BF00806882

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  • DOI: https://doi.org/10.1007/BF00806882

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