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Characterization of supported platinum by a probe reaction

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Abstract

A probe reaction is proposed to measure the number of active hydrogen atoms on platinum supported catalysts. Adsorbed hydrogen is titrated by ethylene pulses. The reaction product, ethane, desorbs quantitatively and can be measured directly by gas chromatography. This determination yields the total number of active hydrogen atoms per Pt atom (NAH). The method was tested on a set of Pt/Al2O3 catalysts. The results show that NAH can exceed several times the number of metal atoms on the catalyst and increases with the time of catalyst treatment with hydrogen at high temperature. The turnover rate for ethylene hydrogenation is constant when referred to NAH, but not when referred to the percentage of exposed metal atoms, as determined by conventional methods.

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Authors and Affiliations

  1. Laboratorio de Superficies, Escuela de Ingeniería Química, Universidad del Zulia, Apartado 4001-526, Venezuela

    Eduardo Choren, José Hernández, Arnedo Arteaga, Geomar Arteaga, Helí Lugo, Marcos Arráez, Andrés Parra & Jorge Sánchez

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  1. Eduardo Choren
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  2. José Hernández
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  3. Arnedo Arteaga
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  4. Geomar Arteaga
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  5. Helí Lugo
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  6. Marcos Arráez
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  7. Andrés Parra
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  8. Jorge Sánchez
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Choren, E., Hernández, J., Arteaga, A. et al. Characterization of supported platinum by a probe reaction. Catal Lett 1, 283–291 (1988). https://doi.org/10.1007/BF00765308

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  • DOI: https://doi.org/10.1007/BF00765308

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