By: Miguel Camblor, Instituto de Ciencia de Materiales de Madrid
When: June, 25 - 12PM (Coffee at 11.30AM)
Where: Salón de Actos
Abstract: Zeolites are crystalline microporous materials with a wide range of applications that are, however, limited by the size and dimensionality of their pores. Stable silica zeolites with a 3D system of extra-large pores (i.e. pores with a minimum window made by more than 12 SiO4 tetrahedra) are in demand but have defied our synthetic capabilities for over 8 decades. Very recently, we have reported three new stable silica-based zeolites. The first one, ZEO-1, has been synthesized by a conventional hydrothermal approach with two less conventional features: the use of a very large phosphonium cation and of a relatively high crystalization temperature.[1] The second one, ZEO-3, was prepared by an unprecedented 1D-to-3D topotactic condensation of a chain silicate.[2] The last one, ZEO-5, is the result of an equally unprecedented inter-chain expansion reaction of the same chain silicate.[3] This series of zeolites represent three density records, bringing ZEO-5 (1.10 g/cc) almost to the density of water. In this presentation I will discuss about the synthesis, stability and structural and physicochemical characterization of these materials, as well as on the benefits of their increased porosity.
[1] Lin et al., A Stable Zeolite Catalyst with Intersecting Three-Dimensional Extra-Large Plus Large Pores, Science, 2021, 374, 1605-1608
[2] Li et al., A 3D Extra-Large Pore Zeolite Enabled by 1D-to-3D Topotactic Condensation of a Chain Silicate, Science, 2023, 379, 283-287
[3] Gao et al., Interchain Expanded Extra-Large Pore Zeolites, Nature, 2024, 628, 99-103
