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Temperature-programmed desorption of H2 as a tool to determine metal surface areas of Cu catalysts

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Abstract

Temperature-programmed desorption of H2 (H2 TPD) is shown to be a useful new tool for the determination of Cu metal surface areas. The technique has been employed in on-line characterization of binary Cu/Al2O3 and ternary Cu/ZnO/Al2O3 catalysts in a combined TPD-microreactor setup. The catalysts were studied both after reduction and after water gas shift activity tests. A main H2 TPD peak is observed around 300 K which can be assigned to desorption from Cu metal surface sites. The H2 TPD method is compared with the N2O frontal chromatography method which has been extensively used in previous studies for the determination of Cu surface areas. It is found that the dissociative adsorption of N2O may induce significant changes in the catalyst structure leading to errors in the surface area determination. With the H2 TPD procedure such irreversible changes can be avoided. A further advantage of the H2 TPD method is the possibility of providing insight into the nature of the exposed Cu metal surfaces.

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Author notes

  1. Martin Muhler

    Present address: Fritz-Haber-Institut der Max-Planck-gesellschaft, W-1000, Berlin 33, Germany

Authors and Affiliations

  1. Haldor Topsøe Research Laboratories, DK-2800, Lyngby, Denmark

    Martin Muhler, Lars P. Nielsen, Eric Törnqvist, Bjerne S. Clausen & Henrik Topsøe

Authors
  1. Martin Muhler
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  2. Lars P. Nielsen
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  3. Eric Törnqvist
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  4. Bjerne S. Clausen
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  5. Henrik Topsøe
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Additional information

On leave from Institute of Physics, University of Aarhus, DK-8000 Aarhus C, Denmark.

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Muhler, M., Nielsen, L.P., Törnqvist, E. et al. Temperature-programmed desorption of H2 as a tool to determine metal surface areas of Cu catalysts. Catal Lett 14, 241–249 (1992). https://doi.org/10.1007/BF00769661

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  • DOI: https://doi.org/10.1007/BF00769661

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