Synergistic Effects of Multicomponents Produce Outstanding Soot Oxidation Activity in a Cs/Co/MnO_x Catalyst

Abstract

The control of soot emission from diesel vehicles is of extraordinary importance to the environment, and catalytic removal of soot is a highly effective and clean method. Here, we report a novel, non-noble metal catalyst for application in the catalytic combustion of soot with superb activity and resistance to H2O and SO2. MnO x oxide was prepared via a hydrothermal method, and then, Cs and Co were loaded on MnO x by impregnation. The 5%Cs/1%Co/MnO x catalyst displayed excellent catalytic activity with values of T 10 (332 °C), T 50 (371 °C), and T 90 (415 °C) under loose contact. The as-prepared catalysts were investigated by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), H2 temperature-programmed reduction (TPR), O2 temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), and X-ray absorption fine structure (XAFS). The results suggest that, after the introduction of Cs and Co into the MnO x oxide, more NO2 molecules take part in soot oxidation, exhibiting higher NO2 utilization efficiency; this is due to the synergistic effects of multiple components (Cs, Co, and Mn) promoting the generation of more surface-active oxygen and then accelerating the reaction between NO2 and soot. This study provides significant insights into the development of high-efficiency catalysts for soot oxidation, and the developed 5%Cs/1%Co/MnO x catalyst is a promising candidate for application in diesel particulate filters.

Promotional Effects of Sm/Ce/La Doping on Soot Oxidation over MnCo2O4 Spinel Catalysts

“…As shown in Figure c, the NO 2 yield was linearly correlated with the catalytic activity, further indicating that NO 2 was the key factor for improving the catalytic activity during soot oxidation. According to the previous reports, NO 2 reacts with soot to generate surface oxygen complexes (SOCs), and surface-active oxygen could accelerate the oxidation of SOCs to form CO 2 . , A good linear correlation between the O α ratio and the catalytic activity of catalysts was also observed, as shown in Figure d. Moreover, a close linear correlation existed between the peak area of O 2 -TPD and the catalytic activity (Figure S8).…”

Niobium oxide promoted with alkali metal nitrates for soot particulate combustion: elucidating the vital role of active surface nitrate groups

“…The combination of an oxidation catalyst and a diesel particulate filter (DPF) honeycomb has been proved to be an effective way to get rid of soot particulate pollution from diesel engines. 1–4 So far, different kinds of catalysts have been tried for this process, 5–23 among which supported precious metals are still the most promising catalysts, and have been successfully applied in real soot particle eliminations.…”

Facile preparation, catalytic performance and reaction mechanism of MnxCo1−xOδ/3DOM-m Ti0.7Si0.2W0.1Oycatalysts for the simultaneous removal of soot and NOx

“…Pollution originating from diesel engine exhaust emissions has resulted in serious threats to the atmosphere, the environment and to human health. 1,2 Soot particles and nitrogen oxides are the main pollutants emitted from diesel engines, [3][4][5] therefore, their removal is a problem that must be solved urgently. 6 In conventional diesel vehicle exhaust control systems, the combination of the diesel particulate filter (DPF) and selective catalytic reduction (SCR) is considered to be an effective after-treatment technology that can be used to eliminate NO x and soot.…”