Fluoride-mediated synthesis of TON and MFI zeolites using 1-butyl-3- methylimidazolium as structure-directing agent

Pergher, Sibele Berenice Castellã; Lopes, Christian W.; Hortigüela, Luis Gomez; Rojas, Alex

Fluoride-mediated synthesis of TON and MFI zeolites using 1-butyl-3- methylimidazolium as structure-directing agent

Página do item simplificado Estatísticas

dc.contributor.author	Pergher, Sibele Berenice Castellã
dc.contributor.author	Lopes, Christian W.
dc.contributor.author	Hortigüela, Luis Gomez
dc.contributor.author	Rojas, Alex
dc.date.accessioned	2020-07-13T15:05:26Z
dc.date.available	2020-07-13T15:05:26Z
dc.date.issued	2017-11-01
dc.description.resumo	In this work, 1-butyl-3-methylimidazolium (1B3MI) cation has been employed as a structure-directing agent for the synthesis of pure silica and Ti-containing zeolites in fluoride media. The 1B3MI OSDA exhibited distinct phase selectivity depending on the synthesis conditions, and particularly the concentration of the synthesis gel. Thus, under more diluted conditions (H2O/SiO2 ¼ 14), the 1B3MI cation yielded pure silica TON zeolite with high crystallinity. Attempts to obtain Ti-containing zeolites, however, failed at this diluted condition even after 15 days of synthesis. In contrast, highly crystalline Ti-MFI was the only phase obtained upon reducing the H2O/SiO2 molar ratio from 14 to 7. The presence of Ti in the MFI zeolite framework was confirmed by both infrared and DRS UV-vis spectroscopies. The presence of intact OSDA molecules within the micropores was inferred from elemental analysis and 13C CP-MAS NMR spectroscopy. On the other hand, thermogravimetric analyses showed a different packing of the 1B3MI cation in the pure silica TON and Ti-MFI samples. Moreover, the environments for Si and F species in the as-made materials were investigated by means of 29Si and 19F MAS NMR, respectively. Finally, molecular simulations showed that the most stable arrangement of the 1B3MI cations involves the location of the imidazolium rings on the channel intersections and of the butyl chains on the sinusoidal channels	pt_BR
dc.identifier.citation	LOPES, Christian W.; HORTIGÜELA, Luis GÓMEZ; ROJAS, Alex; PERGHER, Sibele Berenice Castellã. Fluoride-mediated synthesis of TON and MFI zeolites using 1-butyl-3-methylimidazolium as structure-directing agent. Microporous And Mesoporous Materials, [s.l.], v. 252, p. 29-36, nov. 2017. ISSN1387-1811. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S1387181117304201?via%3Dihub. Acesso em: 13 jul. 2020. http://dx.doi.org/10.1016/j.micromeso.2017.06.017	pt_BR
dc.identifier.doi	10.1016/j.micromeso.2017.06.017
dc.identifier.issn	1387-1811
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29573
dc.language	en	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Zeolite synthesis	pt_BR
dc.subject	Fluoride media	pt_BR
dc.subject	TON	pt_BR
dc.subject	MFI	pt_BR
dc.subject	Ionic liquid	pt_BR
dc.subject	1-butyl-3-methylimidazolium	pt_BR
dc.subject	Titanium	pt_BR
dc.title	Fluoride-mediated synthesis of TON and MFI zeolites using 1-butyl-3- methylimidazolium as structure-directing agent	pt_BR
dc.type	article	pt_BR