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- Title
Pd-Pb Alloy Nanocrystals with Tailored Composition for Semihydrogenation: Taking Advantage of Catalyst Poisoning.
- Authors
Wenxin Niu; Yongjun Gao; Weiqing Zhang; Ning Yan; Xianmao Lu
- Abstract
Metallic nanocrystals (NCs) with well-defined sizes and shapes represent a new family of model systems for establishing structure-function relationships in heterogeneous catalysis. Here in this study, we show that catalyst poisoning can be utilized as an efficient strategy for nanocrystals shape and composition control, as well as a way to tune the catalytic activity of catalysts. Lead species, a well-known poison for noble-metal catalysts, was investigated in the growth of Pd NCs. We discovered that Pb atoms can be incorporated into the lattice of Pd NCs and form Pd-Pb alloy NCs with tunable composition and crystal facets. As model catalysts, the alloy NCs with different compositions showed different selectivity in the semihydrogenation of phenylacetylene. Pd-Pb alloy NCs with better selectivity than that of the commercial Lindlar catalyst were discovered. This study exemplified that the poisoning effect in catalysis can be explored as efficient shape-directing reagents in NC growth, and more importantly, as a strategy to tailor the performance of catalysts with high selectivity.
- Subjects
ALLOYS; NANOCRYSTALS; HYDROGENATION; METALLIC composites; CATALYSIS; ETHYNYL benzene; CATALYSTS
- Publication
Angewandte Chemie, 2015, Vol 127, Issue 28, p8389
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201503148