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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.

As a useful outcome of the suggested practice a permeability-pore structure correlation extending over 5 orders of magnitude for cordierite and SiC porous media is obtained and the effect of catalyst coating on the filter flow resistance is analyzed.