The Promotion of Particulate Matter Oxidation by Oxide Ion Conductors, Zr-Y-O and Zr-Nd-O

Catalytic particulate matter oxidation and its promotion by high oxide ion conductors, Zr-Y-O and Zr-Nd-O, has been studied. Zr-Based oxides show higher particulate matter oxidation activity by O-2 compared to a Ce-based conventional catalyst using Pt-loaded oxide coated on a DPF substrate. Isotopic tracer methods involving O-18 indicate Zr-based oxides release a large amount of lattice oxygen during carbon oxidation. Also, unique to the Zr-based oxides is an electron and electromotive force generation between carbon-deposited sites and carbon-free sites during carbon oxidation. Zr-Based oxides appear to have the capability to effectively generate oxide ions well suited for carbon oxidation.