Multinuclear high resolution solid state NMR characterization of zeolites Nu-10 and ZSM-5 synthesized in presence of tetraethylenepentamine and diaminopropane.

Concettina Pellegrino; Rosario Aiello; Flaviano Testa; Fortunato Crea; Alain Tuel; Janos B.Nagy

Multinuclear high resolution solid state NMR characterization of zeolites Nu-10 and ZSM-5 synthesized in presence of tetraethylenepentamine and diaminopropane.

Concettina Pellegrino, Rosario Aiello, Flaviano Testa, Fortunato Crea, Alain Tuel, Janos B.Nagy

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Résumé

Multinuclear high resolution solid state NMR characterization of zeolites Nu-10 and ZSM-5 synthesized in presence of tetraethylenepentamine and diaminopropane. C. Pellegrino, R. Aiello, F. Testa, F. Crea, A. Tuel and J. B.Nagy, Microporous Mesoporous Mater., 47 (2001) 85-96

langue originale	Anglais
Etat de la publication	Publié - 2001

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@misc{796a650248eb4f6cb1a7f6be38a52fa5,

title = "Multinuclear high resolution solid state NMR characterization of zeolites Nu-10 and ZSM-5 synthesized in presence of tetraethylenepentamine and diaminopropane.",

abstract = "The synthesis of zeolite Nu-10 was investigated in the presence of alkali chlorides and tetraethylenepentamine (TEPA) or 1,3-diaminopropane (DAP) as organic structure-directing agents. By means of 13C CP MAS NMR spectroscopy it was possible to identify in each case the nature of the organic species occluded in the channel system of the as-synthesized zeolite. TEPA is incorporated intact in its di- or tri-protonated form, depending on the Al content of the initial hydrogel. DAP is occluded in its mono-protonated form together with n-propylamine, di-n-propylamine and pyridine, these latter stemming from a prompt decomposition of DAP during the synthesis. This decomposition can be strongly affected by the synthesis temperature; the organic intermediates so formed can readily favor the formation of other types of zeolite structures and hence completely re-orient the synthesis route. Structural SiO- defect groups, neutralizing the excess of positive charges, are created together with terminal SiOH groups. Their relative amounts were determined using chemical and thermal analysis combined with 29Si NMR data",

author = "Concettina Pellegrino and Rosario Aiello and Flaviano Testa and Fortunato Crea and Alain Tuel and Janos B.Nagy",

year = "2001",

language = "English",

type = "Other",

}

TY - GEN

T1 - Multinuclear high resolution solid state NMR characterization of zeolites Nu-10 and ZSM-5 synthesized in presence of tetraethylenepentamine and diaminopropane.

AU - Pellegrino, Concettina

AU - Aiello, Rosario

AU - Testa, Flaviano

AU - Crea, Fortunato

AU - Tuel, Alain

AU - B.Nagy, Janos

PY - 2001

Y1 - 2001

N2 - The synthesis of zeolite Nu-10 was investigated in the presence of alkali chlorides and tetraethylenepentamine (TEPA) or 1,3-diaminopropane (DAP) as organic structure-directing agents. By means of 13C CP MAS NMR spectroscopy it was possible to identify in each case the nature of the organic species occluded in the channel system of the as-synthesized zeolite. TEPA is incorporated intact in its di- or tri-protonated form, depending on the Al content of the initial hydrogel. DAP is occluded in its mono-protonated form together with n-propylamine, di-n-propylamine and pyridine, these latter stemming from a prompt decomposition of DAP during the synthesis. This decomposition can be strongly affected by the synthesis temperature; the organic intermediates so formed can readily favor the formation of other types of zeolite structures and hence completely re-orient the synthesis route. Structural SiO- defect groups, neutralizing the excess of positive charges, are created together with terminal SiOH groups. Their relative amounts were determined using chemical and thermal analysis combined with 29Si NMR data

AB - The synthesis of zeolite Nu-10 was investigated in the presence of alkali chlorides and tetraethylenepentamine (TEPA) or 1,3-diaminopropane (DAP) as organic structure-directing agents. By means of 13C CP MAS NMR spectroscopy it was possible to identify in each case the nature of the organic species occluded in the channel system of the as-synthesized zeolite. TEPA is incorporated intact in its di- or tri-protonated form, depending on the Al content of the initial hydrogel. DAP is occluded in its mono-protonated form together with n-propylamine, di-n-propylamine and pyridine, these latter stemming from a prompt decomposition of DAP during the synthesis. This decomposition can be strongly affected by the synthesis temperature; the organic intermediates so formed can readily favor the formation of other types of zeolite structures and hence completely re-orient the synthesis route. Structural SiO- defect groups, neutralizing the excess of positive charges, are created together with terminal SiOH groups. Their relative amounts were determined using chemical and thermal analysis combined with 29Si NMR data

M3 - Other contribution

ER -

Multinuclear high resolution solid state NMR characterization of zeolites Nu-10 and ZSM-5 synthesized in presence of tetraethylenepentamine and diaminopropane.

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