MFI-type zeolites from natural materials: a comparative study of MFI-type zeolites generated from different diatomite species (part I)

A new one step approach for the preparation of MFI-type zeolites through direct trans-formation of pre-modified diatomite is reported. Two diatomite species modified by calcination and acid treatment were used as silica and alumina sources. The progress of the transformation was investigated by anal...

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Bibliographic Details
Published in:Journal of porous materials 2016-12, Vol.23 (6), p.1609-1618
Main Authors: Ahmad Alyosef, Hallah, Roggendorf, Hans, Schneider, Denise, Inayat, Alexandra, Welscher, Julia, Schwieger, Wilhelm, Münster, Tom, Kloess, Gert, Ibrahim, Suzan, Enke, Dirk
Format: Article
Language:English
Subjects:
Aluminum oxide
Anatase
Catalysis
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Crystallization
Diatomaceous earth
Diatomite
Dissolution
Feldspars
Impurities
Molecular chains
Optical emission spectroscopy
Physical Chemistry
Quartz
Reagents
Scanning electron microscopy
Silicon dioxide
Sodium hydroxide
Transformations
X-ray diffraction
Zeolites
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Summary:A new one step approach for the preparation of MFI-type zeolites through direct trans-formation of pre-modified diatomite is reported. Two diatomite species modified by calcination and acid treatment were used as silica and alumina sources. The progress of the transformation was investigated by analyzing samples after different crystallization times at 453 K. Tetrapropylammonium hydroxide was utilized for the first time as bi-functional molecule for silica dissolution in diatomite and structure directing agent during zeolite formation. In this way, the use of an additional alkaline source, such as sodium hydroxide, for silica dissolution was not necessary. The applied diatomite samples contained amorphous silica in combination with impurities like feldspar, anatase and quartz. This allowed the systematic investigation of the influence of modification procedure, amorphous silica content and crystalline impurities of the different diatomite samples on the direct transformation in MFI-type zeolites. During the transformation process, the feldspar was totally dissolved. The quartz content was reduced to
ISSN:1380-2224
1573-4854
DOI:10.1007/s10934-016-0222-z