New gold and silver-gold catalysts in the shape of sponges and sieves |
| |
| Authors: | Birte Jürgens Christian Kübel Christian Schulz Tobias Nowitzki Volkmar Zielasek Jürgen Biener Monika M Biener Alex V Hamza and Marcus B?umer |
| |
| Affiliation: | (1) EastChem and School of Chemistry, University of St Andrews, The Purdie building, North Haugh, St Andrews, Fife, KY16 9ST, UK;(2) Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;(3) Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, 200433 Shanghai, People’s Republic of China |
| |
| 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. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
