Citation: Zhang Chao, Li Sihan, Wu Chenliang, Li Xiaoqing, Yan Xinhuan. Preparation and Characterization of Pt@Au/Al₂O₃ Core-Shell Nanoparticles for Toluene Oxidation Reaction[J]. Acta Physico-Chimica Sinica, ;2020, 36(8): 190705. doi: 10.3866/PKU.WHXB201907057 shu

Preparation and Characterization of Pt@Au/Al₂O₃ Core-Shell Nanoparticles for Toluene Oxidation Reaction

State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, P. R. China

Corresponding author: Yan Xinhuan, xhyan@zjut.edu.cn
Received Date: 19 July 2019
Revised Date: 27 August 2019
Accepted Date: 9 September 2019
Available Online: 9 September 2019
Fund Project: The project was supported by the National Key R&D Program (2017YFC0210900) and Zhejiang Science and Technology Plan Project, China (2016C31104)the National Key R&D Program 2017YFC0210900Zhejiang Science and Technology Plan Project, China 2016C31104

Customizing core-shell nanostructures is considered to be an efficient approach to improve the catalytic activity of metal nanoparticles. Various physiochemical and green methods have been developed for the synthesis of core-shell structures. In this study, a novel liquid-phase hydrogen reduction method was employed to form core-shell Pt@Au nanoparticles with intimate contact between the Pt and Au particles, without the use of any protective or structure-directing agents. The Pt@Au core-shell nanoparticles were prepared by depositing Au metal onto the Pt core; AuCl⁴⁻ was reduced to Au(0) by H₂ in the presence of Pt nanoparticles. The obtained Pt@Au core-shell structured nanoparticles were characterized by transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), high-resolution TEM, fast Fourier transform, powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and H₂-temperature programmed reduction (H₂-TPR) analyses. The EDX mapping results for the nanoparticles, as obtained from their scanning transmission electron microscopy images in the high-angle annular dark-ﬁeld mode, revealed a Pt core with Au particles grown on its surface. Fourier transform measurements were carried out on the high-resolution structure to characterize the Pt@Au nanoparticles. The lattice plane at the center of the nanoparticles corresponded to Pt, while the edge of the particles corresponded to Au. With an increase in the Au content, the intensity of the peak corresponding to Pt in the FTIR spectrum decreased slowly, indicating that the Pt nanoparticles were surrounded by Au nanoparticles, and thus confirming the core-shell structure of the nanoparticles. The XRD results showed that the peak corresponding to Pt shifted gradually toward the Au peak with an increase in the Au content, indicating that the Au particles grew on the Pt seeds; this trend was consistent with the FTIR results. Hence, it can be stated that the Pt@Au core-shell structure was successfully prepared using the liquid-phase hydrogen reduction method. The catalytic activity of the nanoparticles for the oxidation of toluene was evaluated using a fixed-bed reactor under atmospheric pressure. The XPS and H₂-TPR results showed that the Pt₁@Au₁/Al₂O₃ catalyst had the best toluene oxidation activity owing to its lowest reduction temperature, lowest Au 4d & 4f and Pt 4d & 4f binding energies, and highest Au⁰/Au^δ⁺ and Pt⁰/Pt²⁺ proportions. The Pt₁@Au₂Al₂O₃ catalyst showed high stability under dry and humid conditions. The good catalytic performance and high selectivity of Pt@Au/Al₂O₃ for toluene oxidation could be attributed to the high concentration of adsorbed oxygen species, good low-temperature reducibility, and strong interaction.
- Catalyst,
- Synergy,
- Nanomaterials,
- Core-shell structure,
- VOCs
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Preparation and Characterization of Pt@Au/Al2O3 Core-Shell Nanoparticles for Toluene Oxidation Reaction

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Preparation and Characterization of Pt@Au/Al₂O₃ Core-Shell Nanoparticles for Toluene Oxidation Reaction