The synthesis and crystal structure of the microporous cryst. aluminosilicate ERS-10 are here described. The zeolite was synthesized using a 6-azonia-spiro-[5,5]-undecane hydroxide as structure directing agent (SDA), tetraethylorthosilicate (TEOS) and aluminum-isopropoxide (AiP) as silica and aluminum sources, resp. ERS-10 is characterized by a relatively narrow field of existence, since the unselective SDA used favors the crystn. of other zeolite phases (MTW, MOR, Beta). Crystn. of pure ERS-10 requires the hydrothermal treatment at 443 K for at least 240 h of a gel with the following compn.: SiO2/Al2O3 = 80-160, SDA/SiO2 = 0.2-0.3, H2O/SiO2 close to 45. Preliminary low resoln. powder X-ray characterization revealed that the material is affected by structural disorder such as stacking faults; however the comparison of the powder pattern, and the anal. of the cell parameters obtained by indexing the sharp reflections, suggested a close correlation among ERS-10 and NU-87 (IZA code NES), EU-1 (IZA code EUO) and nonasil (IZA code NON) type zeolites. Starting from this base, using an extensively model building and the program DIFFaX, we were able to demonstrate that the new zeolite material ERS-10 is an intergrowth of three structurally related zeolite with the NON, EUO and NES framework topol.
Synthesis and framework topology of the new disordered ERS-10 zeolite.
CRUCIANI, Giuseppe;
2007
Abstract
The synthesis and crystal structure of the microporous cryst. aluminosilicate ERS-10 are here described. The zeolite was synthesized using a 6-azonia-spiro-[5,5]-undecane hydroxide as structure directing agent (SDA), tetraethylorthosilicate (TEOS) and aluminum-isopropoxide (AiP) as silica and aluminum sources, resp. ERS-10 is characterized by a relatively narrow field of existence, since the unselective SDA used favors the crystn. of other zeolite phases (MTW, MOR, Beta). Crystn. of pure ERS-10 requires the hydrothermal treatment at 443 K for at least 240 h of a gel with the following compn.: SiO2/Al2O3 = 80-160, SDA/SiO2 = 0.2-0.3, H2O/SiO2 close to 45. Preliminary low resoln. powder X-ray characterization revealed that the material is affected by structural disorder such as stacking faults; however the comparison of the powder pattern, and the anal. of the cell parameters obtained by indexing the sharp reflections, suggested a close correlation among ERS-10 and NU-87 (IZA code NES), EU-1 (IZA code EUO) and nonasil (IZA code NON) type zeolites. Starting from this base, using an extensively model building and the program DIFFaX, we were able to demonstrate that the new zeolite material ERS-10 is an intergrowth of three structurally related zeolite with the NON, EUO and NES framework topol.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
