The intermediate phase between sodalite and cancrinite: Synthesis of nano-crystals in the presence of Na2CO3/TEA and its thermal- and hydrothermal stability

Grader, Corinna; Buhl, Josef‐Christian

doi:10.1016/j.micromeso.2012.12.023

Cited by 12 publications

(19 citation statements)

References 18 publications

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“…With this concept the refinement of the unit‐cell parameters of SO 4 ‐INT succeeds well with a cell of a 0 = 7.373(9) Å and c 0 = 2.620(4) Å. Similar values were refined for the other members of the INT family …”

Section: Resultssupporting

confidence: 52%

“…This is a clear sign that the structure of this product can be characterized by the random disorder of aluminosilicate sheets between ABC stacking along [111] found in the in sodalite structure and AB stacking along [001] found in the cancrinite structure as already mentioned (see Introduction). The formation of sulfate enclathrated intermediate phase SO 4 ‐INT between SOD and CAN can be definitely derived therefrom; similar to the carbonate containing samples as well as nitrate imbibed INT‐products . The INT family can thus be extended as group of the phases CO 3 ‐INT ,, NO 3 ‐INT and the new SO 4 ‐INT phase of this paper.…”

Section: Resultsmentioning

confidence: 53%

“…The formation of sulfate enclathrated intermediate phase SO 4 ‐INT between SOD and CAN can be definitely derived therefrom; similar to the carbonate containing samples as well as nitrate imbibed INT‐products . The INT family can thus be extended as group of the phases CO 3 ‐INT ,, NO 3 ‐INT and the new SO 4 ‐INT phase of this paper.…”

Section: Resultsmentioning

confidence: 53%

“…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 SO 4 ‐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 CO 3 ‐INT, as well as NO 3 ‐INT…”

mentioning

confidence: 68%

“…This structural arrangement gives rise to formation of cages of various sizes . Later the CO 3 ‐INT was also prepared in nanocrstalline form and its special properties were investigated compared to the microcrystals …”

Section: Introductionmentioning

confidence: 99%

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Synthesis of a Sulfate Enclathrated Zeolite with Intermediate Framework Structure between Sodalite and Cancrinite

Buhl

2017

Zeitschrift anorg allge chemie

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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.

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Section: Resultssupporting

confidence: 52%