Tracking dynamic structural changes in catalysis by rapid 2D-XANES microscopy.

ABSTRACT: Many processes and materials in heterogeneous catalysis undergo dynamic structural changes depending on their chemical environment. Monitoring such dynamic changes can be challenging using conventional spectroscopic characterization tools, due to the high time resolution required. Here, a high-resolution 2D X-ray camera operating at 50 Hz full-frame rate was synchronized with a QEXAFS monochromator, enabling rapid spectro-microscopic imaging with chemical contrast over individual pixels. This was used to monitor chemical gradients within a model Pt/Al₂O₃ catalyst during catalytic partial oxidation of methane to synthesis gas. The transition from methane combustion (partly oxidized Pt) to combustion-reforming and partial oxidation (fully reduced Pt) was observed by a c

SUBMITTER: Alizadehfanaloo S 

PROVIDER: S-EPMC8415324 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature