Highly efficient oxidation of soot over RuOx/SiO2 in fluidized bed reactor

The potentialities of RuOx/SiO2 for soot oxidation have been investigated using a temperature programmed reaction technique. Among the noble metal catalysts, RuOx/SiO2 exhibited the highest activities in fluidized bed reactor. The temperature at 50% soot conversion over RuOx/SiO2 in the presence of NO and O-2 is about 120 K lower than that only in the presence of O-2. It has been identified that NO was adsorbed on the surface of RuOx in the presence of O-2. The adsorbed NO was highly active for oxidizing soot, which can be attributed to the high mass transferring of the active species in the reaction systems. The mechanism of NO dissociation is also discussed in soot oxidation. (C) 2013 Elsevier B.V. All rights reserved.