The reduction of a Re promoted Co/γ-Al2O3 catalyst was monitored in situ by synchrotron X-ray powder diffraction (XRPD) under H2 environment. Whole powder pattern analysis revealed a non-linear expansion of the unit cell of γ-Al2O3 during the reduction process, suggesting the diffusion of Co cations into the structure of the support. The non-linear cell expansion coincided with the formation of a CoO phase. In addition, space resolved diffraction at the inlet and the outlet of the reactor evidenced a negative effect of the partial pressure of indigenous H2O(g) on the reduction process.
Tsakoumis, N. E., Johnsen, R. E., van Beek, W., Rønning, M., Rytter, E., & . Holmen, A. (2016). Capturing metal-support interactions in situ during the reduction of a Re promoted Co/γ-Al2O3 catalyst. Chemical Communications, 52(15), 3239-3242. https://doi.org/10.1039/c5cc09879c