Zeolites are microporous silicates with a large variety of applications as catalysts, adsorbents, and cation exchangers. Stable silica-based zeolites with increased porosity are in demand to allow adsorption and processing of large molecules but challenge our synthetic ability. We report a new, highly stable pure silica zeolite called ZEO-3, which has a multidimensional, interconnected system of extra-large pores open through windows made by 16 and 14 silicate tetrahedra, the least dense polymorph of silica known so far. This zeolite was formed by an unprecedented one-dimensional to three-dimensional (1D-to-3D) topotactic condensation of a chain silicate. With a specific surface area of more than 1000 square meters per gram, ZEO-3 showed a high performance for volatile organic compound abatement and recovery compared with other zeolites and metal-organic frameworks.
Three metal complexes [CuL(NO3)]n (1), [Cd(HL)(NO3)2]n (2) and [EuL(HCOOH)(H2O)(NO3)2] (3) were synthesized with a pyridyl Schiff ligand L (N'-[(1E)-pyridin-2-ylmethylidene]pyridine-4-carbohydrazide). Crystallographic study reveals complexes 1 and 2 have a chain structure,...
Zeolites are microporous silicates that find an ample variety of applications as catalysts, adsorbents, and cation exchangers. Stable silica-based zeolites with increased porosity are in demand to allow adsorption and processing of large molecules, but challenge our synthetic ability. Here we report a novel, highly stable pure silica zeolite, ZEO-3, with a multidimensional, interconnected system of extra-large pores open through windows made by 16 and 14 SiO4 tetrahedra, which is the less dense polymorph of silica known so far. With a specific surface area over 1000 m 2 /g, ZEO-3 shows an extraordinary performance for Volatile Organic Compounds abatement and recovery. This zeolite is formed by a 1D-to-3D topotactic condensation of a chain silicate, an unprecedented, never predicted approach.
Zeolites are microporous silicates that find an ample variety of applications as catalysts, adsorbents, and cation exchangers. Natural and synthetic zeolites possess a fully connected three-dimensional network of corner-sharing SiO4 tetrahedra (i.e. they are tectosilicates or framework silicates, with Si occasionally substituted by other atoms). Stable silica-based zeolites with increased porosity are of interest to allow processing of large molecules, but challenge our synthetic ability. Here we report a novel zeolite, ZEO-3, with a multidimensional, interconnected system of extra-large pores open through windows made by 16 and 14 SiO4 tetrahedra, which, with a specific surface area of over 1000 m2/g and an extraordinary performance for Volatile Organic Compounds abatement, is the less dense polymorph of silica known so far. This zeolite, however, is not directly synthesized as a tectosilicate but is the first three-dimensional zeolite that is obtained by topotactic condensation from a one-dimensional chain silicate (inosilicate, ZEO-2), a process that bears a 17% contraction of the structure but that does not alter the topology of the chain silicate (hence the term “topotactic”). This discovery challenges concepts deeply-rooted into zeolite science, and opens up the possibility of chain silicates as precursors for the crystallization of zeolites.
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