Interaction-Induced Self-Assembly of Au@La2O3 Core–Shell Nanoparticles on La2O2CO3 Nanorods with Enhanced Catalytic Activity and Stability for Soot Oxidation

The sintering resistance of supported Au nanoparticle (NP) catalysts is crucial to their practical application in heterogeneous catalysis reactions. Herein, a series of Au@La2O3 core–shell nanoparticle catalysts supported on the surfaces of La2O2CO3 nanorods (Aun@La2O3/LOC-R) were successfully synthesized via the method of interaction-induced self-assembly. Supported Au NPs with uniform size are deposited on the surfaces of La2O2CO3 nanorods by the gas bubbling-assisted membrane reduction (GBMR) method. La2O3 shell layers spontaneously formed and then partially coated the surface of Au NPs for interaction-induced self-assembly of Au@La2O3 core–shell NPs during the process of calcination at 600 °C. The strong interaction between Au NPs and La2O3 oxides increases the density of active sites (oxygen vacancies) for enhancing the adsorption–activation properties of O2. Aun@La2O3/LOC-R catalysts show high catalytic activity and stability for soot oxidation under the conditions of loose contact between soot and ...