材料科学
X射线光电子能谱
贵金属
纳米颗粒
钛酸酯
纳米材料基催化剂
钯
化学工程
催化作用
傅里叶变换红外光谱
介孔材料
金属
纳米技术
无机化学
化学
复合材料
有机化学
冶金
陶瓷
工程类
作者
Kevin Ament,Daniel R. Wagner,Thomas Götsch,Takayuki Kikuchi,Jutta Kröhnert,Annette Trunschke,Thomas Lunkenbein,Takayoshi Sasaki,Josef Breu
标识
DOI:10.1021/acscatal.1c00031
摘要
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.
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