| Summary: | Soot particles in diesel engine exhaust is one of the main reasons for hazy weather and elimination of them is urgent for environmental protection. At present, it is still a challenge to develop new catalysts with high efficiency and low cost. In this paper, a kind of K modified three-dimensionally ordered macroporous (3DOM) MnCeO<sub>x</sub>/Ti<sub>0.7</sub>Si<sub>0.3</sub>O<sub>2</sub> catalysts are designed and synthesized by a sample method. Due to the macroporous structure and synergistic effect of K, Mn, and Ce, the K<sub>n</sub>MnCeO<sub>x</sub>/Ti<sub>0.7</sub>Si<sub>0.3</sub>O<sub>2</sub> (K<sub>n</sub>MnCeO<sub>x</sub>/M-TSO) catalysts exhibit good catalytic performance for soot combustion. The catalytic activity of K<sub>0.5</sub>MnCeO<sub>x</sub>/M-TSO was the best, and the T<sub>10</sub>, T<sub>50</sub>, and T<sub>90</sub> are 287, 336, and 367 °C, respectively. After the prepared catalyst was doped with K, the physicochemical properties and catalytic performance changed significantly. In addition, the K<sub>0.5</sub>MnCeO<sub>x</sub>/M-TSO catalyst also somewhat exhibits sulfur tolerance owing to it containing Ti. Because of its simple synthesis, high activity, and low cost, the prepared K<sub>n</sub>MnCeO<sub>x</sub>/M-TSO catalysts are regarded as a promising candidate for application.
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