Quantitative localisation of titanium in the framework of titanium silicalite-1 using anomalous X-ray powder diffraction.

ABSTRACT: One of the biggest obstacles to developing better zeolite-based catalysts is the lack of methods for quantitatively locating light heteroatoms on the T-sites in zeolites. Titanium silicalite-1 (TS-1) is a Ti-bearing zeolite-type catalyst commonly used in partial oxidation reactions with H₂O₂, such as aromatic hydroxylation and olefin epoxidation. The reaction mechanism is controlled by the configuration of titanium sites replacing silicon in the zeolite framework, but these sites remain unknown, hindering a fundamental understanding of the reaction. This study quantitatively determines heteroatoms within the zeolite-type framework using anomalous X-ray powder diffraction (AXRD) and the changes in the titanium X-ray scattering factor near the Ti K-edge (4.96 keV). Two

SUBMITTER: Rzepka P 

PROVIDER: S-EPMC11377426 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature