Facile synthesis, excellent catalytic performance, and reaction mechanisms of KCoMnOhollow nanotube catalysts for soot combustion.

Source: PubMed, NCBI / U.S. National Library of Medicine

The soot particles released by diesel engine exhaust present substantial threats to both human well-being and the environment. The research on catalysts for soot combustion has emerged as a vital research direction in the after-treatment technology of diesel engine. In this study, a series of low-cost, high-efficiency K and Co co-modified MnO(KCoMnO) catalysts were successfully synthesized through the centrifugal spinning method. Characterization results reveal that varying K doping levels significantly influence the surface oxygen species concentration and the NOconversion ability of the catalysts. Density-functional theory calculations reveal that optimal Co doping enhances oxygen activation, thereby improving the catalyst activity for NO oxidation. However, excessive K doping disrupts the nanotube structure, highlighting the need to balance the structural integrity and intrinsic activity of the catalysts. Notably, the KCoMnOhollow nanotube catalyst shows the highest catalytic performance owing to the synergistic interactions between K, Mn, and Co, with its structural advantages. The catalyst achieves T, T, and Tat 277 °C, 326 °C, and 356 °C, respectively. Additionally, the synthesized catalysts exhibit excellent economic viability, high catalytic activity, remarkable stability, strong anti-poisoning properties, and promising potential for soot combustion applications.