In this paper, results of an experimental study on pulsing two-phase flow in SiSiC solid foam packed reactors are presented. Thereby, the pulse characteristics were investigated in a wide range of water and air fluxes at different axial positions for foams with pore densities of 20, 30, and 45 ppi using the ultrafast X-ray computed tomography. Basic pulse shapes were perceived as discs, curtains and bowls, which occurred randomly. The key characteristics, i.e. frequency, velocity and volume of pulses as well as peak and time-averaged liquid holdup, have been extracted by applying a dynamic threshold criterion to time variant liquid holdup profiles. The key properties strongly depend on axial position, pore density and fluid fluxes and can be distinguished in a local and global mode of pulsing. In the local mode, which evolves close to the regime transition boundary, pulses with small liquid volumes move slowly but frequently through the solid foam packed reactor. However, significantly faster pulses with large liquid volumes were encountered in the global mode. The larger pulses cover most of the reactor's cross section but occur less frequently. Compared to literature data for conventional random packings, the pulse frequency was in a similar range, while both pulse velocity and liquid content largely exceeded their counterparts. Phenomenologically, the pore occlusion model was found to be more applicable than the concepts based on flow stability. (C) 2016 Elsevier B.V. All rights reserved.