Soot oxidation over NOx storage catalysts: Activity and deactivation

The effect of C(s) on the trapping of NOx onto Pt/Ba/Al2O3 catalysts

“…Furthermore, it has been reported that the presence of a NSR system improves particulate removal from diesel exhausts [1,[18][19][20]. Previously, [21] we have shown that the reason for this improved activity is related to the increased transient concentration of NO x present during regeneration of the NSR material rather than to any inherent catalytic activity in the components of the NSR material.…”

Beneficial and problematic interactions between NOx trapping materials and carbonaceous particulate matter

“…Also there are relatively few reports regarding any detrimental interactions between NO x traps and soot combustion catalysts although Makkee et al [14] have reported that the NO x storage capacity of NSR materials decreases upon aging under soot oxidising conditions.…”

“…There have been relatively few reports [11][12][13][14] of materials that can both store NO x for and NSR cycle and also combust soot using an NO 2 promoter. This is unusual given that the same first step operates in both cycles and materials that have activity in one cycle might be expected to show some activity in the second.…”

Structured Catalysts for Soot Combustion for Diesel Engines

“…In this vein, soot oxidation in catalytic traps has been recently proposed as an alternative to simultaneously eliminate both NOx and particle contaminants [12]. In our group, it has been demonstrated that the reaction between soot particles and NOx molecules originated by the decomposition of the trapped nitrate species is feasible when a catalytic trap composed of a mixed oxide of Ba, Co, K and Ce is used [13].…”

“…In the last few years, the idea behind the so called "catalytic paper" has been to apply this paper for making structured catalysts for different reactions, for example methanol steam reforming [90][91][93][94] and the reduction of NOx in exhaust gases [85,92]. As said before, diesel soot oxidation in NOx catalytic traps has been recently proposed as an alternative to simultaneously eliminate NOx and particles [95]. Thus, the ceramic catalytic papers could also be applied as structured systems, whose flexibility make them adaptable to different conformations and geometries.…”