Synthesis of AuPt alloy nanoparticles supported on 3D ordered macroporous oxide with enhanced catalytic performance for soot combustion

• Supported AuPt alloy NPs on 3DOM oxides were facilely synthesized by GBMR method.
• Redox properties of the catalysts are enhanced by synergistic effect of AuPt and CZO.
• The contact between soot particle and catalyst is improved by 3DOM support.
• 3DOM AuPt/CZO catalysts exhibit super catalytic performance for soot combustion.
• Introduction of Pt component can improve the stability of supported Au-based catalysts.

The supported AuPt alloy nanoparticles (NPs) were designed and successfully synthesized on the surface of 3D ordered macroporous (3DOM) Ce-based oxides by gas bubbling-assisted membrane reduction (GBMR) method. The AuPt alloy NPs were highly dispersed on the pore wall of 3DOM oxides, and their particle sizes are uniformed. 3DOM supports facilitate the contact between reactants and catalysts, and the synergetic effect of the Au–Pt bimetallic alloy particles can obviously increase the content of surface active oxygen species. 3DOM Ce0.8Zr0.2O2-supported AuPt alloy NP catalysts show super catalytic performance for diesel soot oxidation under “loose” contact condition between soot and catalyst. Among the prepared catalysts, 3DOM Au2Pt2/Ce0.8Zr0.2O2 catalyst has the higher catalytic activity for soot oxidation, e.g., its T10, T50 and T90 are 236, 345 and 397 °C, respectively. In addition, the second component of Pt in AuPt alloy NPs can remarkably improve the stability of the Au-based catalysts for soot oxidation, which is important for practical application in diesel exhaust after-treatment. The design concept and facile synthesis method of 3DOM oxide-supported AuPt alloy NPs nanocatalysts can be extended to other metal compositions, and could illustrate a promising and efficient way to design active sites for nanocatalysts.

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