Technical Paper
On the Effects Induced by the Accumulation of Sodium, Iron and Cerium, on Diesel Soot Filters
1998-02-23
980540
The possible chemical interactions which occur between sodium (as sulphite), iron and cerium (as oxides) coming from pollutants or additives, and the materials which make up three commercial filters, in the working temperature of a Diesel soot filter, were considered. The commercial filters were respectively a cordierite monolith filter, a wound-fiber filter made by continuous Al2O3-B2O3-SiO2 fibers, and a sintered Chrome-Nickel stainless steel filter plate. Some evidence of the chemical interactions was detected coupling X-ray diffraction (XRD) and Hg porosimetry analyses, scanning electron microscopy (SEM) observations and microprobe investigations. The extent of chemical etching, the involved reaction mechanisms and the possible effects on durability, mechanical performances and filtration efficiency of the filters were also investigated.
