Catalytic Soot Combustion?General Concepts and Alkali Promotion

In this Review, we discuss catalytic systems for soot combustion. The focus is on alkali-containing materials since they exhibit the most promising and platinum group metal (PGM) free solutions, providing highly efficient catalysts at a low price. wide range of experimental conditions used catalyst evaluation parameters commonly to compare different was scrutinized. presented synthetic summary classical long-researched reveals that active catalysts, which may fulfill low-temperature activity apart from PGM-based systems, are only those containing alkalis as beneficial dopants. alkali promotion by surface doping or nanostructuration earth abundant transition oxides emerged an effective way develop oxidation materials; therefore, physical nature thoroughly discussed. A detailed presentation state art three-dimensional macroporous presented, these combine with morphological features designed enhancing contact between particles. Finally, set reactivity descriptors alkali-promoted (work function, desorption energy, oxygen availability) proposed foster rational design oxidation.