The goal of this experiment is to study the CO2 and H2 adsorption/desorption at the surface of single alloyed Ni crystals using Bragg Coherent X-ray Diffraction Imaging (BCDI) under various in situ (temperature, T and pressure, p) conditions. The 3D intensity distribution in reciprocal space in the vicinity of a selected Bragg reflection contains information about the shape and strain states of the nanostructure, thus revealing insight into the nature of nanoscale deformation following chemical stimuli, such as adsorption of gases or changes in adsorbate structure. Here, we aim at imaging the strain evolution of pure Ni and alloyed NiFe particles as a function of CO2/H2 gas pressure (from 100 mbar to 800 mbar) and temperature (from 300 K to 773 K). Ni-Fe particles have been demonstrated as the best candidates for an “all-inclusive” material of choice for the carbon dioxide hydrogenation reaction.