The agglomeration and growth of ash during regeneration of a diesel particulate filter was investigated through time-lapse visualization utilizing a field-emission scanning electron microscope and energy dispersive spectroscopy. The primary and large scale ash particles contain calcium, zinc, phosphorous and sulfur were dispersed in Particle Matters (PMs) cake layer. During the shrinkage of PMs Cake layer in regeneration, these ash components were gathered together to form various types of large agglomeration, as well as aggregation ash particles. They were nearly uniform deposited around the perimeters of surface pores.

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A movement and oxidation behaviors of ash during partial oxidation of particulate matters (PMs) was investigated through time-lapse visualization utilizing a field-emission scanning electron microscope and thermogravimetric analysis (TGA). The fine primary ash particles consisted of elements such as zinc and phosphorus. The components of calcium, zinc, phosphorus, and sulfur were included in the large-scale ash particles. These ash particles were gradually moved as the PMs Cake layer shrunk during the regeneration of diesel particulate filters. In addition, ash particles distributed in PMs cake layer have contributed to an enhancement of oxidation rate of the PMs.