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Synthesis of Al-Si-beta and Ti-Si-beta by the aging-drying method
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). College of Chemistry, Jilin University, China.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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Number of Authors: 52012 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 150, no 1, p. 38-46Article in journal (Refereed) Published
Abstract [en]

Al-Si-beta and Ti-Si-beta were synthesized by the aging-drying method in fluoride medium without seeding and using tetraethylammonium hydroxide as organic structure-directing agent (OSDA). In the aging-drying method the gels are allowed to release some volatile species (mainly ethanol and water). Samples with molar batch composition: SiO(2):0.54TEAOH:0.7HF:xH(2)O:yM(n+)F(n)(-) (where x approximate to 10, y = 0.02, M = Al or Ti) were aged and dried during about one week. Organic solvents were added to selected aged-dried gels to determine their role as complementary OSDA. All samples were hydrothermally treated at 140 degrees C during 1-12 days. After crystallization, samples were characterized by PXRD, SEM, TGA-DTG, FTIR, atomic absorption, low temperature nitrogen adsorption, (29)Si MAS NMR and (22)Al MAS NMR. Pure and well-crystallized zeolite beta samples were obtained in all experiments performed. Polymorph A enrichments of about 69% and 64% were reached for Ti and Al loaded samples, respectively. AI-loaded samples exhibited small average crystal sizes compared with Ti-loaded samples. The incorporation of Al in the beta framework was proven by several techniques and the Al/Si ratios were similar to those of the precursor gels. However, Ti incorporation was quite low.

Place, publisher, year, edition, pages
2012. Vol. 150, no 1, p. 38-46
Keywords [en]
Al-Si-beta, Ti-Si-beta, Aging-drying method, Polymorphic enrichment, Fluoride medium
National Category
Chemical Sciences Nano Technology Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-162416DOI: 10.1016/j.micromeso.2011.09.015ISI: 000298721700006OAI: oai:DiVA.org:su-162416DiVA, id: diva2:1268002
Available from: 2018-12-04 Created: 2018-12-04 Last updated: 2018-12-04Bibliographically approved

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