Lowering Combustion Temperature of Carbon Particles on Pt-supported Ceria Series Oxides

Abstract

Catalyst-loaded wall-flow type honeycomb is effective for reducing the level of carbon particle emissions from diesel engines. Pt-supported oxides were investigated for the oxidation and reduction of carbon particles accumulated in the wall-flow type honeycomb. The initiation temperature of combustion of carbon particles was the same for all samples. After the initiation, Pt-supported Ce composite oxides, such as Pt/Ce0.7Zr0.3O2 and Pt/Ce0.9Pr0.1O2, combusted carbon particles at lower temperatures than Pt-supported CeO2, Pt/CeO2. In particular, combustion occurred at the lowest temperature over Pt/Ce0.9Pr0.1O2 after air aging treatment at 1073 K. Pt/Ce0.9Pr0.1O2 released the highest amount of O2 from the oxide at low temperatures and the Pt surface readily oxidized adsorbed CO by O2 in the gaseous phase. Presumably these properties improved the combustion properties of carbon particles.

Preparation of CeO₂-based Nanoparticles and Their Catalytic Properties for Soot Combustion

“…For lowing the combustion temperature, the complete oxidation catalyst of PM is required in DPF, and the catalytic performance for low temperature oxidation should improve the soot combustion during engine operation 6) . CeO 2 -based materials exhibit excellent redox properties of the Ce 3+ -Ce 4+ couple for oxidation catalysis 7,8) .…”

Application of combined plasma-catalytic method for carbon particulate matter (PM) removal

“…Some modied CeO 2 oxides catalyze oxidation of carbon PM mainly because of its function of promoting evolution of lattice oxygen. [16][17][18][19] Moreover, manganese oxides have been reported as the most efficient transition-metal oxide catalysts for catalytic disposal of pollutants and CeO 2 plays an important role as a support owing to its storage capacity of oxygen and thermal stability. [20][21][22] Accordingly, of these two substances, manganese oxides and cerium oxide were chosen and prepared as catalysts in this work.…”

Particulate matter oxidation on Ruddlesden-Popper-type, La1.8Sr1.2Mn2O7

“…5) It is well known that perovskite oxides possess a variety of interesting properties including ferroelectricity, 6) superconductivity 7) and catalytic activity. 11),12) However, the ability of PM oxidation activity of perovskite oxides have not been investigated at the relatively low temperature, sufficiently.…”