A Rational Solid-State Synthesis of Supported Au-Ni Bimetallic Nanoparticles with Enhanced Activity for Gas-Phase Selective Oxidation of Alcohols.
Wuzhong YiWentao YuanYe MengShihui ZouYuheng ZhouWei HongJianwei CheMengjia HaoBin YeLiping XiaoYong WangHisayoshi KobayashiJie FanPublished in: ACS applied materials & interfaces (2017)
A facile confined solid-state seed-mediated alloying strategy is applied for the rational synthesis of supported Au-Ni bimetallic nanoparticles (BMNPs). The method sequentially deposits nickel salts and AuNP seeds into the ordered array of extra-large mesopores (EP-FDU-12 support) followed by a high-temperature annealing process. The size, structure, and composition of the AuNi BMNPs can be well tuned by varying the AuNP seeds, annealing temperature, and feeding ratio of metal precursors. Kinetic studies and DFT calculations suggest that the introduction of the Ni component can significantly prompt the O2 activation on AuNPs, which is critical for the selective alcohol oxidation using molecular O2 as the oxidant. The optimal Au-Ni BMNP catalyst showed the highest turnover frequency (TOF) (59 000 h-1, 240 °C) and highest space-time yield (STY) of benzyl aldehyde (BAD) productivity (9.23 kg·gAu-1·h-1) in the gas-phase oxidation of benzyl alcohol (BA), which is at least about 5-fold higher than that of other supported Au catalysts.
Keyphrases
- metal organic framework
- solid state
- reduced graphene oxide
- visible light
- sensitive detection
- high temperature
- hydrogen peroxide
- transition metal
- gold nanoparticles
- density functional theory
- mass spectrometry
- quantum dots
- highly efficient
- alcohol consumption
- molecular dynamics simulations
- ms ms
- electron transfer
- high throughput
- ionic liquid
- climate change
- bone mineral density
- single molecule
- anti inflammatory
- postmenopausal women