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Synthesis and characterization of zincosilicates with mfi-type structure
Source
The Arabian Journal for Science and Engineering. Section C, Theme issues
Issue
Vol. 24, Issue 1C (30 Jun. 1999), pp.57-70, 14 p.
Publisher
King Fahd University of Petroleum and Minerals
Publication Date
1999-06-30
Country of Publication
Saudi Arabia
No. of Pages
14
Main Subjects
Abstract EN
-Zincosilicates were hydrothermally crystallized in the presence of tetrapropylammonium cations (TPA).
Crystals having the MFI-type structure were obtained.
The isomorphous substitution and other physico-chemical properties of the samples were explored and to some extent compared with silicalite-I impregnated with zinc to similar levels.
X-ray diffraction and scanning electron microscopy ensured the crystallinity and purity of the samples.
Elemental composition showed that the level of zinc influenced the water, sodium, and TPA contents of the unit cell.
Scanning electron microscopy showed the morphology of the crystals changed on introducing zinc in the synthesis.
Thermal analysis showed that the temperature of the TPA decomposition increased with the zinc level in the samples.
Mid-infrared spectroscopy of the as-synthesized zincosilicates has shown a band at 1084 cm-1 in addition to the band at 1100 cm-1.
This extra band disappeared upon calcination.
NH3-TPD showed that there is probably a low concentration of only Lewis acid sites.
Although no direct evidence has been obtained indicating zinc isomorphous substitution in the framework, XPS showed that zinc is homogeneously distributed throughout the crystals of zincosilicate relative to zinc impregnated silicalite-I.
The presence of zinc in the pores of zincosilicates reduces the pore volume of the materials relative to that of silicalite-I.
Keywords: silicalite, MFI, zinc, zeolite, isomorphous substitution, physico-chemical properties, synthesis
American Psychological Association (APA)
al-Daous, Muhammad A.& al-Arfaj, Abd al-Rahman& Klein, Uwe K. A.& Bari, Sami A. I.& Shirokoff, John. 1999. Synthesis and characterization of zincosilicates with mfi-type structure. The Arabian Journal for Science and Engineering. Section C, Theme issues،Vol. 24, no. 1C, pp.57-70.
https://search.emarefa.net/detail/BIM-389748
Modern Language Association (MLA)
al-Daous, Muhammad A.…[et al.]. Synthesis and characterization of zincosilicates with mfi-type structure. The Arabian Journal for Science and Engineering. Section C, Theme issues Vol. 24, no. 1C (Jun. 1999), pp.57-70.
https://search.emarefa.net/detail/BIM-389748
American Medical Association (AMA)
al-Daous, Muhammad A.& al-Arfaj, Abd al-Rahman& Klein, Uwe K. A.& Bari, Sami A. I.& Shirokoff, John. Synthesis and characterization of zincosilicates with mfi-type structure. The Arabian Journal for Science and Engineering. Section C, Theme issues. 1999. Vol. 24, no. 1C, pp.57-70.
https://search.emarefa.net/detail/BIM-389748
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 70
Record ID
BIM-389748