Three-Dimensionally Ordered Macroporous Mn_<i>x</i>Ce_1–<i>x</i>O_δ and Pt/Mn_0.5Ce_0.5O_δ Catalysts: Synthesis and Catalytic Performance for Soot Oxidation

Abstract

Three-dimensionally ordered macroporous (3DOM) MnxCe1–xOδ oxides with different ratios of Mn to Ce were successfully synthesized by colloidal crystal template (CCT) method, and 3DOM Pt/Mn0.5Ce0.5Oδ with varied Pt loadings were prepared by in situ ethylene glycol (EG) reduction method. 3DOM MnxCe1–xOδ supports exhibited well-defined 3DOM nanostructure, and Pt nanoparticles (NPs) with 1–2 nm size were evenly dispersed on the inner walls of uniform macropores. Among 3DOM MnxCe1–xOδ catalysts, 3DOM Mn0.5Ce0.5Oδ showed excellent catalytic activity for soot combustion; i.e., T50 is 358 °C and SCO2m is 94.2%. 3DOM Pt/Mn0.5Ce0.5Oδ catalysts exhibited higher activity than 3DOM MnxCe1–xOδ and 3 wt % Pt/Mn0.5Ce0.5Oδ showed the highest catalytic activity for soot combustion (T50 is 342 °C and SCO2m is 96.7%). Macropores effect, synergistic effects between Mn and Ce, and synergistic effects between Pt and Mn0.5Ce0.5Oδ support are contributed to high catalytic activities of as-prepared catalysts.