5D operando tomographic diffraction imaging of a catalyst bed

• DOI: 10.1038/s41467-018-07046-8
• Publication Date: 2018-11-06T11:48:22Z
• Authors: A. Vamvakeros; S. D. M. Jacques; M. Di Michiel; D. Matras; V. Middelkoop; I. Z. Ismagilov; E. V. Matus; V. V. Kuznetsov; J. Drnec; P. Senecal; A. M. Beale
• Keywords: Rietveld Refinement; Powder Diffraction; Tomographic reconstruction; Partial oxidation

We report the results from first 5D tomographic diffraction imaging experiment of a complex Ni-Pd/CeO2-ZrO2/Al2O3 catalyst used for methane reforming. This five-dimensional (three spatial, one scattering and dimension to denote time/imposed state) approach enabled us track chemical evolution many particles across bed relate these changes gas environment that experience. Rietveld analysis some 2 × 106 patterns allowed extract heterogeneities in Å nm μm scale (3D maps corresponding unit cell lattice parameters, crystallite sizes phase distribution respectively) under different environments. are able capture Ni-containing species gain more complete insight into multiple roles CeO2-ZrO2 promoters reasons behind partial deactivation during oxidation methane.