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Structural aspects of synthetic zeolite: A comparative assay through positron annihilation and gas adsorption methods
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10.1063/1.1997285
/content/aip/journal/jap/98/3/10.1063/1.1997285
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/3/10.1063/1.1997285

Figures

Image of FIG. 1.
FIG. 1.

The sodalite unit: truncated octrahedron. Euler’s theorem for polyhedra states that where is the number of faces, is the number of vertices, and the number of edges. There are 36 edges, 24 vertices, 6 square faces, and 8 hexagonal faces.

Image of FIG. 2.
FIG. 2.

(a) TEM picture of zeolite-13X grains after sonication in alcohol, with a magnification of . (b) Illustration of the alumino-silicate framework of the X-type zeolite by joining the units of cubo octahedra linked with each other. The pointer shows the sodalite units.

Image of FIG. 3.
FIG. 3.

(a) TEM picture of zeolite-Y grains after sonication in alcohol, with a magnification of . (b) Illustration of the framework of zeolite-Y type with the assembly of the sodalite units showing the supercage (Ref. 16).

Image of FIG. 4.
FIG. 4.

Pore size distribution obtained from BET in (a) zeolite-Y and (b) zeolite-H (—●—for cage during adsorption and—엯—for cage during desorption) samples. (c) BET curve of adsorption-desorption isotherm for zeolite H showing hysteresis.

Image of FIG. 5.
FIG. 5.

Positronium lifetime spectra for zeolite 13X (●) and zeolite H (엯) depicting the noticeable change in slope for the long-lifetime component (indicating larger cavity) of zeolite H (-axis channel ).

Tables

Generic image for table
Table I.

The wide-angle x-ray-diffraction studies showing the crystallinity factor and particle size measured from the Scherrer method.

Generic image for table
Table II.

The long-lived components of positronium annihilation parameters as determined from the positron lifetime spectroscopy and the evaluated void sizes from Eqs. (6) and (7) for the respective cases.

Generic image for table
Table III.

The pore structures as determined from BET adsorption-desorption isotherms for zeolite-Y and zeolite-H forms.

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/content/aip/journal/jap/98/3/10.1063/1.1997285
2005-08-05
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structural aspects of synthetic zeolite: A comparative assay through positron annihilation and gas adsorption methods
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/3/10.1063/1.1997285
10.1063/1.1997285
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