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As a result, it was found that thinner wall thickness design had lower pressure loss before coating and that advantage was kept after coating until 60 g/l wash-coat amount. 6 mil wall thickness design had a potential of about 30% downsizing of the filter size compared to 13 mil one from the point of view of coated pressure loss. ...The PN filtration efficiency was influenced by the wall thickness and pore size distribution after catalyst coating. As a conclusion, it was confirmed that the thinner-wall high-porosity R-SiC GPF has a possibility of catalyst amount reduction, better packaging for TWC coated GPF system because of its downsizing potential due to lower pressure loss and smaller heat capacity.

SiC-made 10mil/300cpsi-OctoSquare asymmetric cell structure was chosen for the DPF substrate and PM oxidation catalyst was coated on the surface of the filter wall as a layer with the device of the coating method. As a result, it was found that the layer coated DPF has advantage on the filtration efficiency without soot accumulation and efficiency was similar to an uncoated one with 0.1 g/l soot loading.

The full-size high porosity DPF prototype was evaluated in the engine bench and it was confirmed that the high porosity SiC-DPF with oxide film forming technology had a possibility to achieve both the high SCR catalyst coating capability and high filtration efficiency after coating to meet Euro6 particle number emission limit to realize the SCR coated DPF system. ...To integrate the SCR converter into the DPF, it is necessary to design the DPF substrate's porosity higher and pore size larger than conventional DPF to improve SCR catalyst coating capability. However to make the porosity higher will lose the robustness in general. Against these problems, it was studied to improve the high porosity DPF performances by applying the new technology to modify the thermal shock resistance property.

On the other hand, it was found that the gas permeability was not affected significantly by any parameter when the catalyst was coated because the coating caused a broadening of the pore distribution. In addition, it was found that any parameter prior to the catalyst coating did not have a real impact on the gas purification efficiency. ...In addition, it was found that any parameter prior to the catalyst coating did not have a real impact on the gas purification efficiency. It is considered that the catalyst coating should be selectively applied to pores to sharpen the pore distribution for decreasing the pressure loss and increasing the emission control performance after coating the catalyst. ...It is considered that the catalyst coating should be selectively applied to pores to sharpen the pore distribution for decreasing the pressure loss and increasing the emission control performance after coating the catalyst.

The experiments are analyzed with a state-of-the-art diesel particulate filter simulator and a set of kinetic parameters are derived for direct catalytic soot oxidation by fuel-borne catalysts as well as by catalytic coatings. The influence of soot-catalyst proximity, on catalytic soot oxidation is found to be excellently described by the so-called Two-Layer model, developed previously by the authors. ...The study of conversion dependent phenomena during isothermal catalytic soot oxidation reveals that geometry is more important than chemistry and that advanced coating technologies that promote soot-catalyst contact can provide sustained oxidation independently from the conversion level.