La0.8K0.2Mn0.95Cu0.05O3 perovskite-type oxide was synthesized by the complex method of citric acid

then was supported on γ-Al2O3 to obtain a series of loadings by using the impregnation method

complexing method and mixing method. Temperature programmed oxidation (TPO) was used to investigate their catalytic behavior of model soot oxidation in a feed gas containing various concentrations of SO2. The catalysts were characterized with XRD

BET

and FT-IR. XRD and BET results showed that the catalysts exhibited good structure of perovskite-type before being supported

and the specific surface area increased after being supported. TPO tests revealed that the activity of La0.8K0.2Mn0.95Cu0.05O3/γ-Al2O3 prepared by the impregnation method with 20%(mass) loading was better. La0.8K0.2Mn0.95Cu0.05O3 catalyst presented higher catalytic activity than those supported ones

i. e. La0.8K0.2Mn0.95Cu0.05O3/γ-Al2O3

however

sulfur-resistance of catalysts was improved when supported on γ-Al2O3. FT-IR spectrum confirmed that with increasing concentration of SO2

the SO2-4 species formed and accumulated on the catalyst surface would inhibit the catalytic activity.