31P and119Sn high resolution solid state CP/MAS NMR study of Al2O3-SnO2 systems

Sheng, Tai-Cheng; Kirszensztejn, Piotr; Bell, T. N.; Gay, Ian D.

doi:10.1007/bf00812139

Cited by 31 publications

(33 citation statements)

References 18 publications

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“…w e prepared a silica monolayer by the CVD (chemical vapor deposition) of silicon alkoxide on y-alumina, titania, and zirconia. ["-251 Similar vapor-phase methods to load silica were reported on alumina [26][27][28] and other metal oxides.…”

supporting

confidence: 60%

A heat‐resisting acid catalyst: Thermal stability and acidity of a thin silica layer on alumina calcined at 1493 K

Katada

Ishiguro

Muto

et al. 1995

Chemical Vapor Deposition

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The chemical vapor deposition of a thin layer of silica on alumina is shown to improve the thermal stability of alumina with respect to sintering and to reduce the loss of surface area of alumina during heating. Benzaldehyde-ammonia titration showed that samples with high stability were almost completely covered by silica. These observations suggest that an ultrathin silica layer, probably a monolayer, thermally stabilizes the surface. Brsnsted acidity was observed even after calcination at 1493 K: it was initially diminished by this calcination, but readily recovered on exposure to a humid atmosphere, whereas conventional solid-acid catalysts are irreversibly deactivated by complete sintering.

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supporting

confidence: 60%

A heat‐resisting acid catalyst: Thermal stability and acidity of a thin silica layer on alumina calcined at 1493 K

Katada

Ishiguro

Muto

et al. 1995

Chemical Vapor Deposition

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“…8 In the framework of a structural study of lithiumintercalated compounds,9 we investigated the SnS 2 e †ects of structural and electronic changes on the tin nucleus in a series of tin sulÐdes (SnS, by In conclusion, the high-resolution 119Sn NMR spectra for the three sulÐdes agree well with their x-ray structures. However, a closer investigation of the Sn(IV) peak in reveals a Ðne structure (Fig.…”

Section: Introductionmentioning

confidence: 55%

119Sn Solid-State NMR of Tin Sulfides. Evidence of Polytypism in SnS2

Pietraß

Taulèlle

1997

Magn. Reson. Chem.

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“…Many authors observed the formation of Lewis acid site after dealumination of zeolites [10][11][12][13][14][15][16], but different opinions on the origin of Lewis acid site were reported in the literature. In general, there are two typical models.…”

Section: Discussionmentioning

confidence: 99%

“…However, the limitation of this technique lies in the difficulty to determine the strength of the acidity and the number of acid sites in a quantitative way for the different extinction coefficients of each adsorbed species. Trimethylphosphine has emerged as a promising approach to characterize the acid sites in zeolites [10][11][12] and other materials [13][14][15] using 31 P MAS NMR spectroscopy. Trimethylphosphine (TMP) is suitable for 31 P MAS NMR studies as it has isotope of 100% natural abundance, nuclear spin of 1/2, and large gyromagnetic ratio.…”

Section: Introductionmentioning

confidence: 99%