Enhancing the Catalytic Activity of Palladium Nanoparticles via Sandwich-Like Confinement by Thin Titanate Nanosheets
| Autor: | Annette Trunschke, Josef Breu, Thomas Götsch, Jutta Kröhnert, Daniel Wagner, Thomas Lunkenbein, Kevin Ament, Takayuki Kikuchi, Takayoshi Sasaki |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
010405 organic chemistry Intercalation (chemistry) Nanoparticle General Chemistry engineering.material 010402 general chemistry CO oxidation 01 natural sciences Catalysis Titanate layered titanate 0104 chemical sciences support−metal interaction heterogeneous catalysis Chemical engineering X-ray photoelectron spectroscopy engineering palladium nanoparticles Noble metal Fourier transform infrared spectroscopy Mesoporous material Research Article |
| Zdroj: | ACS Catalysis |
| ISSN: | 2155-5435 |
| DOI: | 10.1021/acscatal.1c00031 |
| Popis: | As atomically thin oxide layers deposited on flat (noble) metal surfaces have been proven to have a significant influence on the electronic structure and thus the catalytic activity of the metal, we sought to mimic this architecture at the bulk scale. This could be achieved by intercalating small positively charged Pd nanoparticles of size 3.8 nm into a nematic liquid crystalline phase of lepidocrocite-type layered titanate. Upon intercalation the galleries collapsed and Pd nanoparticles were captured in a sandwichlike mesoporous architecture showing good accessibility to Pd nanoparticles. On the basis of X-ray photoelectron spectroscopy (XPS) and CO diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) Pd was found to be in a partially oxidized state, while a reduced Ti species indicated an electronic interaction between nanoparticles and nanosheets. The close contact of titanate sandwiching Pd nanoparticles, moreover, allows for the donation of a lattice oxygen to the noble metal (inverse spillover). Due to the metal–support interactions of this peculiar support, the catalyst exhibited the oxidation of CO with a turnover frequency as high as 0.17 s–1 at a temperature of 100 °C. |
| Databáze: | OpenAIRE |
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