Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 13, Issue 7, Pages 2571-2581Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0cp01859g
Keywords
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Funding
- Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy [DE-AC05-00OR22725]
- Oak Ridge National Laboratory by the Scientific User Facilities Division, U.S. Department of Energy
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
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Supported gold nanoparticles have generated an immense interest in the field of catalysis due to their extremely high reactivity and selectivity. Recently, alloy nanoparticles of gold have received a lot of attention due to their enhanced catalytic properties. Here we report the synthesis of silica supported AuCu nanoparticles through the conversion of supported Au nanoparticles in a solution of Cu(C2H3O2)(2) at 300 degrees C. The AuCu alloy structure was confirmed through powder XRD (which indicated a weakly ordered alloy phase), XANES, and EXAFS. It was also shown that heating the AuCu/SiO2 in an O-2 atmosphere segregated the catalyst into a Au-CuOx heterostructure between 150 degrees C to 240 degrees C. Heating the catalyst in H-2 at 300 degrees C reduced the CuOx back to Cu-0 to reform the AuCu alloy phase. It was found that the AuCu/SiO2 catalysts were inactive for CO oxidation. However, various pretreatment conditions were required to form a highly active and stable Au-CuOx/SiO2 catalyst to achieve 100% CO conversion below room-temperature. This is explained by the in situ FTIR result, which shows that CO molecules can be chemisorbed and activated only on the Au-CuOx/SiO2 catalyst but not on the AuCu/SiO2 catalyst.
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