Nitridation of ultrastable Y zeolite: Influence of experimental parameters

Srasra, Mondher; Rouxhet, Paul; Gaigneaux, Éric M.; Delsarte, Stéphanie

doi:10.1016/s0167-2991(06)80990-0

Cited by 2 publications

(4 citation statements)

References 3 publications

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“…Indeed the substitution of oxygen atoms by nitrogen atoms in the immediate vicinity of both silicon and aluminum was evidenced by combination of NMR and XPS techniques based on the evolution of 29 Si NMR and 27 Al NMR spectra from one side and Auger peak of silicon and aluminum in the other side. The extension of the substitution is much important at higher temperature …”

Section: Resultsmentioning

confidence: 99%

“…In a recent contribution, we reported that the nitridation of micromesoporous ultrastable Y zeolites "USY", a family of zeolites known for its thermal stability, allows an efficient nitrogen insertion into the framework and consequently the preparation of a new class of basic catalysts still possessing both high surface area and internal volume. 16 A clear identification of nitrogenous species incorporated into the zeolite framework is essential to allow a deeper understanding of the role of nitrogen in the enhancement of the basic properties. In this paper, we have used diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) and X-ray photoelectron spectroscopy (XPS) in order to elucidate the nature of nitrogenous species present in the nitrided zeolites and to study the influence of nitridation temperature on the relative concentration of these species.…”

Section: Introductionmentioning

confidence: 99%

“…In a recent contribution, we reported that the nitridation of micromesoporous ultrastable Y zeolites “USY”, a family of zeolites known for its thermal stability, allows an efficient nitrogen insertion into the framework and consequently the preparation of a new class of basic catalysts still possessing both high surface area and internal volume …”

Section: Introductionmentioning

confidence: 99%

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Nitrided Zeolites: A Spectroscopic Approach for the Identification and Quantification of Incorporated Nitrogen Species

Srasra¹,

Delsarte²,

Gaigneaux³

2010

J. Phys. Chem. C

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The combination of X-ray photoelectron spectroscopy (XPS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) allowed a clear identification and quantification of nitrogenous species incorporated upon nitridation in three different zeolites one Y zeolite (Si/Al ratio of 2.6) and two ultrastable Y zeolites (Si/Al ratios of 13 and 37). Both the amount and the chemical nature of incorporated nitrogen species were controlled by the nitridation temperature. Namely, an increase of the temperature induces an increase of the nitrogen content and the appearance of nitrogenous species in the following order of increasing temperature: NH4 +, adsorbed NH3, −NH2, >NH, and >N−. Based on these spectroscopic results, a mechanism of nitridation in function of temperature was proposed, this mechanism being independent of the properties of the parent zeolite. We evidenced here that the replacement of hydroxyls groups located in the microposity of the zeolite by nitrogen species was effective which can be very motivating result for the application of these materials as shape selective catalysts.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nitrided Zeolites: A Spectroscopic Approach for the Identification and Quantification of Incorporated Nitrogen Species

Srasra¹,

Delsarte²,

Gaigneaux³

2010

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

show abstract

“…In a recent contribution, we reported that the nitridation of micro-mesoporous ultrastable Y zeolites ''USY'', a family of zeolites known for its thermal stability, allows an efficient nitrogen insertion into the framework and consequently the preparation of a new class of basic catalysts still possessing both high surface area and internal volume [16]. In this work the abilities of three different zeolites, one Y zeolite (Si/Al ratio of 2.6) and two ultrastable Y zeolites (Si/Al ratio of 13 and 37), to incorporate nitrogen were compared.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Nitridation of Y and USY Zeolites on their Catalytic Activity for the Base Catalyzed Knoevenagel Condensation

2009

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This contribution reports on the preparation, physicochemical characterization and catalytic performances of nitrided zeolites in the Knoevenagel condensation reaction. These basic materials were prepared by subjecting one Y zeolite (Si/Al ratio of 2.6) and two ultrastable Y zeolites (Si/Al ratio of 13 and 37) to nitridation, i.e., treatment with ammonia at high temperature. Both the amount and the chemical nature of incorporated nitrogen species were controlled by the nitridation temperature. Namely, an increase of the temperature induces an increase of the nitrogen content and the appearance of nitrogenous species in the following order of increasing temperature: NH 4 ? , adsorbed NH 3 , -NH 2 , [NH and [N-. The nitridation occurred practically in the same manner whatever the Si/Al ratio of the starting material. However, from a catalytic point of view different behavior was observed. No direct correlation was found with the nitrogen content of the samples. Nitrided zeolites were found to exhibit catalytic activity as long as the zeolitic framework was maintained.

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Nitridation of ultrastable Y zeolite: Influence of experimental parameters

Cited by 2 publications

References 3 publications

Nitrided Zeolites: A Spectroscopic Approach for the Identification and Quantification of Incorporated Nitrogen Species

Nitrided Zeolites: A Spectroscopic Approach for the Identification and Quantification of Incorporated Nitrogen Species

Effects of the Nitridation of Y and USY Zeolites on their Catalytic Activity for the Base Catalyzed Knoevenagel Condensation

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