Details
| Original language | English |
|---|---|
| Pages (from-to) | 1030-1036 |
| Number of pages | 7 |
| Journal | Zeitschrift fur Anorganische und Allgemeine Chemie |
| Volume | 643 |
| Issue number | 15 |
| Publication status | Published - 17 Jul 2017 |
Abstract
A sulfate enclathrated microporous zeolite of composition Na7.4[SiAlO4]6(SO4)0.7(H2O)4.8 with intermediate framework structure (INT) between the well known zeolites sodalite (SOD) and cancrinite (CAN) can be prepared by the autothermal synthesis, a method first demonstrated in reference. The product (abbreviated as “SO4-INT”) was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX-analysis), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetry (TG). SO4-INT was found to crystallize as spheres with 1–6 μm in diameter with a rough surface. Sometimes the spheres are agglutinated to each other by a few amount of amorphous material within the sample. The thermal behavior of the new phase was further studied. At elevated temperature (1000 °C) a transformation of SO4-INT into a large amount of nosean was observed beside some parts of nepheline, formed by crystallization of the amorphous byproduct. The nosean phase was found to be stable up to 1250 °C, before the onset of a total destruction by melting during further heating. Finally a re-crystallization of the melt during cooling yielded carnegieite as the final product (low form at room temperature). This unusual thermal behavior of SO4-INT is discussed in terms of structural interactions of the sulfate guests inside the aluminosilicate host-framework and in comparison with literature data of the intermediate phases CO3-INT, as well as NO3-INT.
Keywords
- Microporous solids, Structural intermediates of SOD and CAN, Sulfate enclathrated zeolites, Thermal stability, Zeolites
ASJC Scopus subject areas
- Chemistry(all)
- Inorganic Chemistry
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In: Zeitschrift fur Anorganische und Allgemeine Chemie, Vol. 643, No. 15, 17.07.2017, p. 1030-1036.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Synthesis of a Sulfate Enclathrated Zeolite with Intermediate Framework Structure between Sodalite and Cancrinite
AU - Buhl, Josef Christian
PY - 2017/7/17
Y1 - 2017/7/17
N2 - A sulfate enclathrated microporous zeolite of composition Na7.4[SiAlO4]6(SO4)0.7(H2O)4.8 with intermediate framework structure (INT) between the well known zeolites sodalite (SOD) and cancrinite (CAN) can be prepared by the autothermal synthesis, a method first demonstrated in reference. The product (abbreviated as “SO4-INT”) was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX-analysis), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetry (TG). SO4-INT was found to crystallize as spheres with 1–6 μm in diameter with a rough surface. Sometimes the spheres are agglutinated to each other by a few amount of amorphous material within the sample. The thermal behavior of the new phase was further studied. At elevated temperature (1000 °C) a transformation of SO4-INT into a large amount of nosean was observed beside some parts of nepheline, formed by crystallization of the amorphous byproduct. The nosean phase was found to be stable up to 1250 °C, before the onset of a total destruction by melting during further heating. Finally a re-crystallization of the melt during cooling yielded carnegieite as the final product (low form at room temperature). This unusual thermal behavior of SO4-INT is discussed in terms of structural interactions of the sulfate guests inside the aluminosilicate host-framework and in comparison with literature data of the intermediate phases CO3-INT, as well as NO3-INT.
AB - A sulfate enclathrated microporous zeolite of composition Na7.4[SiAlO4]6(SO4)0.7(H2O)4.8 with intermediate framework structure (INT) between the well known zeolites sodalite (SOD) and cancrinite (CAN) can be prepared by the autothermal synthesis, a method first demonstrated in reference. The product (abbreviated as “SO4-INT”) was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX-analysis), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetry (TG). SO4-INT was found to crystallize as spheres with 1–6 μm in diameter with a rough surface. Sometimes the spheres are agglutinated to each other by a few amount of amorphous material within the sample. The thermal behavior of the new phase was further studied. At elevated temperature (1000 °C) a transformation of SO4-INT into a large amount of nosean was observed beside some parts of nepheline, formed by crystallization of the amorphous byproduct. The nosean phase was found to be stable up to 1250 °C, before the onset of a total destruction by melting during further heating. Finally a re-crystallization of the melt during cooling yielded carnegieite as the final product (low form at room temperature). This unusual thermal behavior of SO4-INT is discussed in terms of structural interactions of the sulfate guests inside the aluminosilicate host-framework and in comparison with literature data of the intermediate phases CO3-INT, as well as NO3-INT.
KW - Microporous solids
KW - Structural intermediates of SOD and CAN
KW - Sulfate enclathrated zeolites
KW - Thermal stability
KW - Zeolites
UR - http://www.scopus.com/inward/record.url?scp=85024487333&partnerID=8YFLogxK
U2 - 10.1002/zaac.201700101
DO - 10.1002/zaac.201700101
M3 - Article
AN - SCOPUS:85024487333
VL - 643
SP - 1030
EP - 1036
JO - Zeitschrift fur Anorganische und Allgemeine Chemie
JF - Zeitschrift fur Anorganische und Allgemeine Chemie
SN - 0044-2313
IS - 15
ER -