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CO Oxidation over Au/TiO2–Carbon Catalysts: The Effect of Thermal Treatment, Stability and TiO2 Support Structure

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Abstract

The effect of thermal treatment on the catalyst structure and the CO oxidation performance of a Au/TiO2 catalyst supported on a carbon composite material has been studied. X-ray absorption spectroscopy shows that the carbon composite stabilises the TiO2 and prevent agglomeration of the particles. The activity measurements show that both Au and TiO2 need to be present in order to obtain catalytic activity. The catalytic performance was found to be strongly affected by thermal treatments of the active phase prior to the reaction. The thermal treatments have an effect on the ordering of the TiO2 structure, and on the CO oxidation activity. Heat treatment after Au deposition has a positive effect on the CO oxidation performance. This is attributed to the introduction of a stronger interaction between the oxide and Au which improves the catalytic activity. This also indicates that the TiO2 support and the Au–TiO2 interface play important roles in the CO oxidation reaction.

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Acknowledgments

We acknowledge the project teams at the Swiss-Norwegian Beam Lines (SNBL) at ESRF, Kaumudi Pandya at beamline X11A at the National Synchrotron Light Source at BNL, USA, and Luca Olivi at beamline 11.1, ELETTRA, Trieste, Italy, S.C.p.A. for their assistance. Use of the National Synchrotron Light Source, Brookhaven National Laboratory, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886. John C. Walmsley, SINTEF is acknowledged for conducting the TEM studies. The Research Council of Norway (NFR) is acknowledged for financial support through the SYNKROTRON programme.

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Authors and Affiliations

  1. Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), 7491, Trondheim, Norway

    Nina Hammer & Magnus Rønning

  2. Department of Chemistry, Norwegian University of Science and Technology (NTNU), 7491, Trondheim, Norway

    Karina Mathisen

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  1. Nina Hammer
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  2. Karina Mathisen
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  3. Magnus Rønning
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Correspondence to Magnus Rønning.

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Hammer, N., Mathisen, K. & Rønning, M. CO Oxidation over Au/TiO2–Carbon Catalysts: The Effect of Thermal Treatment, Stability and TiO2 Support Structure. Top Catal 56, 637–649 (2013). https://doi.org/10.1007/s11244-013-0023-4

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