Abstract
This work investigated the effect of potassium (K) on the catalytic activity of Co 3O 4 prepared by sol–gel method for soot combustion under loose contact. The catalysts were characterized by XRD, TPR, Raman, FT-IR, and XPS. The results showed the deposition of 4.4 wt.% K accelerated the activity of Co 3O 4 for soot combustion under loose contact, the temperature of maximum soot oxidation rate (Tm) decreased from 490 °C over Co 3O 4 to 417 °C over K(0.1)/Co 3O 4(600). It was discovered that there is an exact linear relationship between Tm and the value of active Co 3+/Co for the first time, where Co represented the total amount Co 3+ and Co 2+. Our findings strongly suggested that potassium, as a promoter, not only favors CB–catalyst contact, but also produces more active Co 3+ with the increase of K content. Doped K entered the crystal lattice and aroused the lattice distortion. The Tm in TPO decreased linearly with the increase of microstrain. The lattice distortion and the interaction of K and Co 3O 4 promoted the formation of the surface active Co 3+ and active O −, and improved the activity of lattice oxygen.
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