Suchergebnisse

The database of prospective zeolites (www. hypotheticalzeolites.net) has been screened in search of feasible zeolites. Previous criteria of zeolite feasibil- ity have been reviewed, based on descriptors such as energy, density, average and distribution of ring sizes, and more importantly that of Li et al. (LID criteria) presented recently [Angew. Chem. Int. Ed. 2013, 52, 1673], based on Si O, O . O, and Si . Si distances of SLC-minimised struc- tures. In spite of the still large number of feasible zeolites according to this and other criteria, a number of research- ers wonder why there are so many feasible and so few synthesised zeolites. Without answering this difficult question, a new criteria is proposed in this study based on the fact that T . T . T angles (T is tetrahedral atom) show spe- cific ranges of values depending on the ring size to which they belong. Based on improved definitions to count and enumerate rings in zeolites, and with data from the IZA database, we introduce the TTT criteria, which we propose to use after the LID criteria, to further narrow the space of feasible zeolites. ; We thank ASIC computational centre of UPV for making available their computational resources. UPV is acknolwdeged by funding through project PAID-05-12. G. S. thanks the Spanish government for the provision of Severo Ochoa project (SEV 2012-0267) and MAT2012-31657 project. Professors Mike Treacy and Christian Baerlocher are gratefully acknowledged for useful discussions. Laurent Baumes is thanked by initial training with the database. ; Liu, X.; Valero Cubas, S.; Argente Villaplana, E.; Botti Navarro, VJ.; Sastre Navarro, GI. (2015). The importance of T . T . T angles in the feasibility of zeolites. Zeitschrift fur Kristallographie. Crystalline materials. 230(5):291-299. https://doi.org/10.1515/zkri-2014-1801 ; S ; 291 ; 299 ; 230 ; 5