Washcoating of catalytic particulate filters studied by time-resolved X–ray tomography

In this paper we introduce a new application of time-resolved X-ray tomography (XRT) to imaging the washcoating process in catalytic monolith filters with honeycomb structure (DPF, GPF). The method is applied several alumina washcoats different particle size distributions deposited on cordierite substrate. results bring insights into drying dynamics porous filter wall as well on-wall catalyst layer, including layer shrinking and cracking. XRT are supplemented by cross-section scanning electron microscopy images mercury intrusion porosimetry final structures. addition statistical analysis washcoat distribution, impact pressure loss determined experiments.