Abstract
We prepared AuAg bimetallic catalysts by sequential deposition method to study the role of Au and Ag in the HCHO catalytic oxidation behavior respectively. We found that the highest activity is found for Au monometallic catalyst, rather than AuAg bimetallic catalyst, which is related to the different HCHO oxidation reaction pathways over Au and Ag active sites from in situ DRIFTS results. In this work, different HCHO conversion pathways were found over the Au and Ag active sites, which consume the surficial OH groups and reactive oxygen species on the catalyst surface respectively, denoted as OH-assisted and Oa-assisted pathways. Au active site is dominated by the OH-assisted pathway because of its excellent activation ability to HCHO reaction intermediates. Ag active site is dominated by the Oa-assisted pathway because of its excellent activation ability to oxygen. In this paper, the catalytic behavior of AuAg bimetallic nanoparticles and the different role of Au and Ag active sites in reaction pathways in HCHO oxidation is clarified and discussed for the first time.
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