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Synthesis of Al-Si-beta and Ti-Si-beta by the aging-drying method
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK). College of Chemistry, Jilin University, China.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
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Antal upphovsmän: 52012 (Engelska)Ingår i: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 150, nr 1, s. 38-46Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2012. Vol. 150, nr 1, s. 38-46
Nyckelord [en]
Al-Si-beta, Ti-Si-beta, Aging-drying method, Polymorphic enrichment, Fluoride medium
Nationell ämneskategori
Kemi Nanoteknik Materialteknik
Identifikatorer
URN: urn:nbn:se:su:diva-162416DOI: 10.1016/j.micromeso.2011.09.015ISI: 000298721700006OAI: oai:DiVA.org:su-162416DiVA, id: diva2:1268002
Tillgänglig från: 2018-12-04 Skapad: 2018-12-04 Senast uppdaterad: 2018-12-04Bibliografiskt granskad

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Willhammar, TomZou, Xiaodong
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Institutionen för material- och miljökemi (MMK)
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Microporous and Mesoporous Materials
KemiNanoteknikMaterialteknik

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