Abstract
Gold with a nanoporous sponge-like morphology, generated by leaching of AuAg alloys is presented as a new unsupported material system for catalytic applications. The role of residual silver for catalytic activity towards CO oxidation in the temperature range from −20 to 50°C has been investigated by comparison with Au and Au/Ag zeolite catalysts. As revealed by a systematic variation of the silver content in the zeolite catalysts, bimetallic systems exhibit a significantly higher activity than pure gold, probably due to activation/dissociation of molecular oxygen by silver. By STEM tomography we can unambiguously prove that at least some of the particles form inside the zeolite lattice.
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Marcus Bäumer is professor at the Institute of Applied and Physical Chemistry of the University of Bremen. He and Volkmar Zielasek, as a senior scientist, head a research group working in the border area between surface science and catalysis with a focus on chemical reactions at nanostructured surfaces, model catalytic studies, and innovative catalytic materials. Birte Jürgens, who was responsible for the preparation of the zeolite catalysts and the catalytic experiments described here, and Tobias Nowitzki are PhD students in this group. Christian Schulz is a former diploma student who worked with the gold foams.
Volkmar Zielasek
Christian Kübel is head of the electron microscopy group at Fraunhofer IFAM and is focusing on structural characterization and properties of (nano)materials. He has previously worked at Philips Natuurkundig Laboratorium / FEI and as a Feodor Lynen (AvH) fellow at the University of Michigan.
Alex Hamza and Juergen Biener are leaders in the Nanoscale Synthesis and Characterization Laboratory (NSCL) at the Lawrence Livermore National Laboratory. The NSCL develops and characterizes novel nanostructured materials such as nanoporous metals and nanocrystalline materials for high-power laser experiments.
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Jürgens, B., Kübel, C., Schulz, C. et al. New gold and silver-gold catalysts in the shape of sponges and sieves. Gold Bull 40, 142–149 (2007). https://doi.org/10.1007/BF03215571
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DOI: https://doi.org/10.1007/BF03215571