Deposition of a Cu/Mo/Ce catalyst for diesel soot oxidation on a sintered metal fiber filter with a CeO_2 anti corrosion coating

摘要

A three-layer metallic soot filter was coated with a CeO_2 bufferlayer and a soot oxidation catalyst based on copper, molybdenum and cerium oxides. Deposition on the diesel particulate filter was performed by dip-coating from aqueous sol-gel media. The effect of dipcoating speed and use of several additives on the shielding effectiveness of the CeO_2 thin film was studied. Thereby corrosion by the catalyst could be avoided. The catalytic activity and thermal stability were studied by thermogravimetric analysis on powder mixtures while catalyst coated filters were analyzed using a flow through reactor. The combustion temperature was lowered with at least 75 °C.