One-pot synthesis of core–shell Au@CeO2−δ nanoparticles supported on three-dimensionally ordered macroporous ZrO2 with enhanced catalytic activity and stability for soot combustion

摘要: A series of multifunctional catalysts three-dimensionally ordered macroporous (3DOM) ZrO2-supported core–shell structural Au@CeO2−δ nanoparticles were successfully synthesized by the one-pot method gas bubbling-assisted membrane reduction–precipitation (GBMR/P). All possess a well-defined 3DOM structure with interconnected networks spherical voids, and different molar ratios Au/Ce are well dispersed supported on inner wall uniform macropore. support facilitates contact efficiency between solid reactant catalyst, strong metal-oxides interaction improve amount active oxygen species sintering resistance Au due to optimization interface area formation (MOCS) nanostructure particles. Au@CeO2−δ/ZrO2 exhibit high catalytic activity stability for diesel soot oxidation. Among as-prepared catalysts, Au@CeO2−δ/ZrO2-2 catalyst moderate thickness CeO2−δ nanolayer shell shows highest combustion, i.e., its T50 is 364 °C. In summary, excellent systems combustion particles or macromolecules, design concept facile synthesis oxide-supported MOCS nanoparticle can be extended other metal/oxide compositions.