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The K_2NiF_4 type oxides, La_ 2-x K_xCuO_4 complex oxides with nanometric size were prepared by sol-gel method. The characters of these samples were analyzed by H_2-TPR, XRD, FT-IR and SEM. The catalytic activity for soot combustion was evaluated by temperature-programmed reaction (TPO) technique. The results demonstrate that the substitution of K~+ for La~ 3+ at A-site will increase the catalytic activities of La_ 2-x K_xCuO_4 to soot combustion greatly, and the substitution quantity affects the structure and catalytic activity obviously. The La_ 1.8 K_ 0.2 CuO_4 complex oxides with tetrahedral structure has the best catalytic activity for soot removal reaction, the ignition temperature of soot combustion is decreased from 490 to 320 ℃.
The K_2NiF_4 type oxides, La_ 2-x K_xCuO_4 complex oxides with nanometric size were prepared by sol-gel method. The characters of these samples were analyzed by H_2-TPR, XRD, FT-IR and SEM. The catalytic activity for soot combustion was The results demonstrate that the substitution of K ~ + for La ~ 3 + at A-site will increase the catalytic activities of La_ 2-x K_xCuO_4 to soot combustion greatly, and the substitution quantity The La_ 1.8 K_ 0.2 CuO_4 complex oxides with tetrahedral structure has the best catalytic activity for soot removal reaction, the ignition temperature of soot combustion is decreased from 490 to 320 ° C.