Journal
CATALYSIS TODAY
Volume 160, Issue 1, Pages 103-108Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2010.05.019
Keywords
Au-Cu alloy; Gold; Copper; Nanoparticle; CO oxidation; PROX
Funding
- National Natural Science Foundation of China (NNSFC) [20773124]
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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. (C) 2010 Elsevier B.V. All rights reserved.
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