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

作者：Zanardi Stefano^*; Millini Roberto; Frigerio Francesco; Belloni Antonio; Cruciani Giuseppe; Bellussi Giuseppe; Carati Angela; Rizzo Caterina; Montanari Erica

来源：Microporous and Mesoporous Materials, 2011, 143(1): 6-13.

DOI：10.1016/j.micromeso.2011.01.025

• ERS-18
• Crystal structure solution
• Focus

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 angstrom. 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 similar to 15.0 (NON) to similar to 20.0 (EUO), to similar to 25.0 angstrom (NES). Therefore, ERS-18 can be regarded as a new member of this family having the longest stacking parameter (i.e. similar to 35.0 angstrom) reported so far. The ERS-18 framework is characterized by the presence of 8-ring channels (crystallographic free dimensions: 3.1 x 2.5 angstrom) running along the [0 1 0] direction and supercages delimited by 12-rings (crystallographic free dimensions: 6.1 x 5.2 angstrom, cross section; 18.4 angstrom, depth) aligned along [1 0 0] and off the 8-ring channels.

• 出版日期2011-8