In situ Raman analyses of the soot oxidation reaction over nanostructured ceria-based catalysts.

ABSTRACT: To reduce the emissions of internal combustion engines, ceria-based catalysts have been widely investigated as possible alternatives to the more expensive noble metals. In the present work, a set of four different ceria-based materials was prepared via hydrothermal synthesis, studying the effect of Cu and Mn as dopants both in binary and ternary oxides. In situ Raman analyses were carried out to monitor the behaviour of defect sites throughout thermal cycles and during the soot oxidation reaction. Despite ceria doped with 5% of Cu featured the highest specific surface area, reducibility and amount of intrinsic and extrinsic defects, a poor soot oxidation activity was observed through the standard activity tests. This result was confirmed by the calculation of soot conversion curves obtaine

SUBMITTER: Sartoretti E 

PROVIDER: S-EPMC6405916 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature