Cross-flow filters are used in exhaust gas after-treatment sytems of modern combustion engines to separate ash and soot particles from the exhaust gas stream. The filter consists of parallel porous channels positioned lengthwise in the exhaust system with alternately blocked ends. The particles are deposited in the inlet channel and form a layer while the gas passes through the porous filter wall to the outlet channel.

The ash and soot particulate layer deposits can lead to unfavorable operating behavior. For example, the pressure loss of the filter increases with increasing layer thickness. The filter must therefore be regenerated regularly (continuous passive C-NO₂ or discontinuous active O₂ regeneration), whereby the hot exhaust gas oxidises the deposited soot particles.

The break-up of the particulate layer is a crucial process that depends on the temperature and the velocity of the exhaust gas, as well as the composition of the layer and the reactivity of the soot. The influence of temperature and velocity has already been sufficiently investigated.

However, the impact of the particulate properties and their reactivity on the resulting ash deposition patterns following the regeneration of the particulate filter remains uncertain. Studies on soot particle sizes have shown a correlation with high reactivity. E-fuels and biomass fuels can also produce different types of soot with different reactivities and dispersities.

In this study, the layer-break up of Carbon Black as reactive particulate material during the regeneration of the filter is investigated to observe the fundamental processes and transport of agglomerates in cross-flow filters. To achieve this purpose..