Surface modification study on cordierite honeycomb ceramics

The samples of cordierite honeycomb ceramics are treated by nitric acid.With cordierite as first carrier and self-made γ-Al2O3 containing rare earth oxides as second carrier the special surface area of cordierite honeycomb ceramics is increased.The test results show that addition of La improves the resistance to sintering of the catalysts and decrease loss of the special surface area of catalyst at elevated temperature.Influence of γ-Al2O3 content and baking temperature on special surface area is analyzed.The structure and the properties of pre-coated cordierite were investigated by means of XRD,BET and SEM.