Abstract
Au-Cu bimetallic catalysts with Au/Cu ratios ranging from 3/1 to 20/1 were prepared on silica gel support by a two-step method. The catalysts were characterized by ICP, XRD and TEM. The results showed that, irrespective of Au/Cu ratios, all the bimetallic nanoparticles had significantly reduced particle sizes (3.0-3.6 nm) in comparison with monometallic gold catalysts (5.7 nm). Both CO oxidation and PROX reactions were employed to evaluate the catalytic activities of Au-Cu bimetallic catalysts. For CO oxidation, the alloy catalysts show non-monotonic temperature dependence showing a valley in the intermediate temperature range. The catalyst with Au/Cu ratio of 20/1 gave the highest activity at room temperature, but its activity showed the deepest valley with increasing the reaction temperature. On the other hand, the catalyst with Au/Cu ratio of 3/1 exhibited the best performance for PROX reaction. For the Au/Cu ratios investigated, the bimetallic catalysts showed superior performance to monometallic gold catalysts, demonstrating the synergy between gold and copper.
Original language | English |
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Pages (from-to) | 103-108 |
Number of pages | 6 |
Journal | Catalysis Today |
Volume | 160 |
Issue number | 1 |
DOIs | |
Publication status | Published - Feb 2 2011 |
Externally published | Yes |
Keywords
- Au-Cu alloy
- CO oxidation
- Copper
- Gold
- Nanoparticle
- PROX
ASJC Scopus subject areas
- Catalysis
- General Chemistry