Stable Silica-based Zeolites with 3D Extra-large Pores | Seminar by Miguel Camblor
Miguel Camblor, researcher at the ICMM, explains in this seminar that 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. The second one, ZEO-3, was prepared by an unprecedented 1D-to-3D topotactic condensation of a chain silicate. The last one, ZEO-5, is the result of an equally unprecedented inter-chain expansion reaction of the same chain silicate. This series of zeolites represent three density records, bringing ZEO-5 (1.10 g/cc) almost to the density of water. In this presentation he discussed about the synthesis, stability and structural and physicochemical characterization of these materials, as well as on the benefits of their increased porosity.
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