Synthesis and characterization of pure silica zeolite beta obtained by an aging-drying method
2011 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, Vol. 143, no 1, 196-205 p.Article in journal (Refereed) Published
Pure silica zeolite beta materials were synthesized by an unconventional method of aging and drying the starting gels at room temperature followed by the conventional hydrothermal treatment. In addition, organic solvents were added to selected samples as complementary structure directing agents (SDA). The influence of the aging-drying method, complementary SDA addition and crystallization time upon the synthesis of pure silica zeolite beta were studied. Samples were characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), thermogravimetric analyses (TGA) and nitrogen adsorption. Results revealed that the aging-drying process increased crystallization rate, produced crystals with unique morphology and scaled-surface and allowed polymorph A enrichments to about 68-70%. It was also found that addition of organic solvents during the thermal treatment tunes the crystal morphology but, does not affect the polymorphic enrichment.
Place, publisher, year, edition, pages
2011. Vol. 143, no 1, 196-205 p.
Al-Si-beta, Ti-Si-beta, Aging-drying method, Polymorphic enrichment, Fluoride medium
Chemical Sciences Physical Chemistry Materials Chemistry
IdentifiersURN: urn:nbn:se:su:diva-68900DOI: 10.1016/j.micromeso.2011.02.030ISI: 000291524700026OAI: oai:DiVA.org:su-68900DiVA: diva2:474039