Hierarchical two-dimensional (2D) lamellar zeolites, consisting of framework Brønsted and/or Lewis acidity as well as meso-/microporosity, show remarkable catalytic performance in reactions involving bulky molecules. Quantitative assessment of catalytic behavior of acid sites in 2D zeolite nanosheets is essential to understand their catalytic consequences, but prior studies are mainly focused on the Brønsted-type acidity. In this talk, we evaluated the catalytic behavior of Lewis acidity in the 2D lamellar titanium silicalite-1 (TS-1) zeolites. 2D multilamellar TS-1 zeolites, without and with pillarization (by silica and silica/titania mixture pillars, respectively) treatment, were prepared as hierarchical lamellar TS-1 zeolites. The quantity and accessibility of Lewis acidity centers (i.e. titanium (Ti)-sites) were assessed by organic base titrations. The catalytic behaviors of external (i.e. in mesopores and on external surface) and internal (i.e. in micropore) acid sites were evaluated by rigorous kinetics analysis of cyclooctene epoxidation with hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) in acetonitrile solvent. In comparison to their microporous analogy (i.e. 3D TS-1).

Catalytic behavior of Lewis acid sites in hierarchical lamellar titanium silicalite-1 zeolites

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.