Enhancing catalytic performance of dilute metal alloy nanomaterials
| Autor: | Joanna Aizenberg, Nicholas Marcella, Erjia Guan, Alexandre C. Foucher, Tanya Shirman, Robert J. Madix, Mathilde Luneau, Eric A. Stach, Wei J. Chen, Michael Aizenberg, David M. A. Verbart, Anatoly I. Frenkel, Cynthia M. Friend |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Hydrogen Alloy chemistry.chemical_element Nanoparticle Sintering 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Biochemistry Nanomaterials Catalysis lcsh:Chemistry chemistry.chemical_compound Materials Chemistry Environmental Chemistry technology industry and agriculture General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences lcsh:QD1-999 chemistry Chemical engineering engineering 0210 nano-technology Carbon monoxide Palladium |
| Zdroj: | Communications Chemistry, Vol 3, Iss 1, Pp 1-9 (2020) |
| ISSN: | 2399-3669 |
| DOI: | 10.1038/s42004-020-0293-2 |
| Popis: | Dilute alloys are promising materials for sustainable chemical production; however, their composition and structure affect their performance. Herein, a comprehensive study of the effects of pretreatment conditions on the materials properties of Pd0.04Au0.96 nanoparticles partially embedded in porous silica is related to the activity for catalytic hydrogenation of 1-hexyne to 1-hexene. A combination of in situ characterization and theoretical calculations provide evidence that changes in palladium surface content are induced by treatment in oxygen, hydrogen and carbon monoxide at various temperatures. In turn, there are changes in hydrogenation activity because surface palladium is necessary for H2 dissociation. These Pd0.04Au0.96 nanoparticles in the porous silica remain structurally intact under many cycles of activation and deactivation and are remarkably resistant to sintering, demonstrating that dilute alloy catalysts are highly dynamic systems that can be tuned and maintained in a active state. Dilute alloy nanoparticles are a promising class of heterogeneous catalysts, but how their composition and structure affects performance is imperfectly understood. Here dilute PdAu catalysts are shown to be highly dynamic, which enables systematic tuning of their structure and composition to maintain an active state. |
| Databáze: | OpenAIRE |
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