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K and Mg substituted perovskite catalysts La 1−x K x Co 1−y Mg y O 3 (x=0–0.4, y=0–0.2) for soot combustion were prepared by citric acid complexation and characterized by XRD, FT-IR, SEM, TEM, EDS, H 2 -TPR, XPS and TG. Soot combustion was remarkably accelerated when K was introduced into LaCoO 3 . Then Mg was doped into the K substituted LaCoO...
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