The data contains the segmented, labeled holographic X-ray computed tomography data of an activated Ni/Al${2}$O${3}$ reference catalyst for CO$_{2}$ methanation.

The holographic X-ray computed tomography experiments were performed on beamline ID16A at the European Synchrotron Radiation Facility (ESRF), Grenoble, France in the frame of experiment CH-5805.

The experimental procedure and data analysis details are provided in the respective original publication. Segmentation and labeling were performed with the software Avizo. The data import is possible and was tested with Avizo and the open source software ImageJ.

The data is named according to the publication "material" is the nanoporous solid, "pores" is the complete pore system and "pores.separate" is the separated pore system into individual pores