Diesel soot combustion over ceria catalyst: Evolution of functional groups on soot surfaces

Effects of thermal aging atmospheres on oxidation activity, element composition and microstructure of diesel soot particles

“…Functional groups are specic atomic groups attached to the soot surface, and are active substances produced during the oxidation process of soot, including oxygencontaining functional groups and hydrocarbon functional groups, which play certain specic roles in the soot oxidation process. 18,19 Domestic and foreign scholars have analyzed the physical and chemical characteristics of soot particles by various means. Ferrari et al 20 found that the I D /I G ratio can be used to evaluate the graphitized structure of soot particles in Raman spectrum of soot, while the small I D /I G represents a high degree of graphitization, and the structure of soot is stable and not easy to oxidize.…”

“…Functional groups are specific atomic groups attached to the soot surface, and are active substances produced during the oxidation process of soot, including oxygen-containing functional groups and hydrocarbon functional groups, which play certain specific roles in the soot oxidation process. 18,19…”

Research Progress on Preparation of Metal Oxide Catalysts with Porous Structure and Their Catalytic Purification of Diesel Engine Exhausts Gases

“…Thus, the development of catalysts with good soot combustion performance is significant for the development of catalytic post-treatment waste gas technology. 229,230 At present, the catalysts for soot combustion include mainly noble metal catalysts, alkali metal catalysts, transition metal oxide catalysts, rare earth metal oxide catalysts, etc. Among the many catalysts studied, metal oxide catalysts with porous structures show excellent catalytic activity for the catalytic oxidation of soot.…”

“…Since the autoignition temperature of PM (550–600 °C) is much higher than the temperature of the diesel exhaust port (150–450 °C), a high-performance catalyst is, therefore, coated on the diesel particulate filter carrier to enable complete combustion of carbon soot particles in the diesel exhaust temperature range for passive regeneration of the DPF. Thus, the development of catalysts with good soot combustion performance is significant for the development of catalytic post-treatment waste gas technology. , At present, the catalysts for soot combustion include mainly noble metal catalysts, alkali metal catalysts, transition metal oxide catalysts, rare earth metal oxide catalysts, etc. Among the many catalysts studied, metal oxide catalysts with porous structures show excellent catalytic activity for the catalytic oxidation of soot.…”