ERS-18, a new small pore high silica zeolite, was synthesized using 6-azonia-spiro-[5,5]-undecane hydroxide as structure directing agent. Its crystal structure was determined ab initio by using high-resolution synchrotron X-ray powder diffraction data and the zeolite-dedicated software FOCUS. ERS-18 shows orthorhombic symmetry (s.g. Fmmm) setting with unit cell parameters: a = 34.989, b = 13.667 and c = 22.559 Å. The values of b and c parameters are in common with zeolites of the NON-EUO-NES family (IZA codes for nonasil, EU-1, and NU-87, respectively); within this group the a parameter, corresponding to the layer stacking direction, varies from ∼15.0 (NON) to ∼20.0 (EUO), to ∼25.0 Å (NES). Therefore, ERS-18 can be regarded as a new member of this family having the longest stacking parameter (i.e. ∼35.0 Å) reported so far. The ERS-18 framework is characterized by the presence of 8-ring channels (crystallographic free dimensions: 3.1 × 2.5 Å) running along the [0 1 0] direction and supercages delimited by 12-rings (crystallographic free dimensions: 6.1 × 5.2 Å, cross section; 18.4 Å, depth) aligned along [1 0 0] and off the 8-ring channels.

ERS-18: A new member of the NON-EUO-NES zeolite family

CRUCIANI, Giuseppe;
2011

Abstract

ERS-18, a new small pore high silica zeolite, was synthesized using 6-azonia-spiro-[5,5]-undecane hydroxide as structure directing agent. Its crystal structure was determined ab initio by using high-resolution synchrotron X-ray powder diffraction data and the zeolite-dedicated software FOCUS. ERS-18 shows orthorhombic symmetry (s.g. Fmmm) setting with unit cell parameters: a = 34.989, b = 13.667 and c = 22.559 Å. The values of b and c parameters are in common with zeolites of the NON-EUO-NES family (IZA codes for nonasil, EU-1, and NU-87, respectively); within this group the a parameter, corresponding to the layer stacking direction, varies from ∼15.0 (NON) to ∼20.0 (EUO), to ∼25.0 Å (NES). Therefore, ERS-18 can be regarded as a new member of this family having the longest stacking parameter (i.e. ∼35.0 Å) reported so far. The ERS-18 framework is characterized by the presence of 8-ring channels (crystallographic free dimensions: 3.1 × 2.5 Å) running along the [0 1 0] direction and supercages delimited by 12-rings (crystallographic free dimensions: 6.1 × 5.2 Å, cross section; 18.4 Å, depth) aligned along [1 0 0] and off the 8-ring channels.
2011
Zanardi, S.; Millini, R.; Frigerio, F.; Belloni, A.; Cruciani, Giuseppe; Bellussi, G.; Carati, A.; Rizzo, C.; Montanari, E.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1559203
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 21
  • ???jsp.display-item.citation.isi??? 20
social impact