High Temperature NMR of Zeolites

Janssen, R.; Dols, P. P. M. A.; Tijink, G. A. H.; Veeman, W. S.

doi:10.1016/s0167-2991(08)61758-9

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“…Solid-state magic-angle spinning nuclear magnetic resonance (MAS-NMR) on zeolites and clays is a powerful technique to elucidate the structural environment of exchangeable cations such as 7Li, Z3Na (Janssen et al, 1989a(Janssen et al, , 1989b, ll3Cd (Bank et al, 1989), and '33Cs (Chu et al, 1987;Kirkpatrick, 1988;Weiss et al, 1990a, ' Publication of the Debye Institute, University of Utrecht, The Netherlands. Copyright 9 1992, The Clay Minerals Society 1990b).…”

Section: Introductionmentioning

confidence: 99%

The Interlayer Collapse During Dehydration of Synthetic Na_0.7-Beidellite: A ²³Na Solid-State Magic-Angle Spinning NMR Study

Kloprogge

Jansen

Schuiling

et al. 1992

Clays and clay miner.

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Abstract--The dehydration and migration of the interlayer cation of the synthetic beidellite Nao.Tm14.7Si7.302o-(OH)4-nH20, were studied with solid-state 23Na and 27A1 MAS-NMR, heating stage XRD, and thermogravimetric analyses (TGA, DTA). The 23Na MAS-NMR of Na-beidellite at 25~ displays a chemical shift of 0.2 ppm, which indicates a configuration comparable with that of Na § in solution. Total dehydration proceeds reversibly in two temperature ranges. Four water molecules per Na § are gradually removed from 25 ~ to 85"C. As a result, the basal spacing decreases from 12.54/~ to 9.98 A and the Na § surrounded by the two remaining water molecules is relocated in the hexagonal cavities of the tetrahedral sheet. The chemical shift of 1.5 ppm exhibited after the first dehydration stage illustrates the increased influence of the tetrahedral sheet. The high local symmetry is maintained throughout the entire first dehydration stage. During the second dehydration, which proceeds in a narrow temperature range around 400~ the remaining two water molecules are removed reversibly without any change of the basal spacing.

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Section: Introductionmentioning

confidence: 99%

The Interlayer Collapse During Dehydration of Synthetic Na_0.7-Beidellite: A ²³Na Solid-State Magic-Angle Spinning NMR Study

Kloprogge

Jansen

Schuiling

et al. 1992

Clays and clay miner.

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High Temperature NMR of Zeolites

Cited by 1 publication

References 5 publications

The Interlayer Collapse During Dehydration of Synthetic Na_0.7-Beidellite: A ²³Na Solid-State Magic-Angle Spinning NMR Study

The Interlayer Collapse During Dehydration of Synthetic Na_0.7-Beidellite: A ²³Na Solid-State Magic-Angle Spinning NMR Study

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High Temperature NMR of Zeolites

Cited by 1 publication

References 5 publications

The Interlayer Collapse During Dehydration of Synthetic Na0.7-Beidellite: A 23Na Solid-State Magic-Angle Spinning NMR Study

The Interlayer Collapse During Dehydration of Synthetic Na0.7-Beidellite: A 23Na Solid-State Magic-Angle Spinning NMR Study

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The Interlayer Collapse During Dehydration of Synthetic Na_0.7-Beidellite: A ²³Na Solid-State Magic-Angle Spinning NMR Study

The Interlayer Collapse During Dehydration of Synthetic Na_0.7-Beidellite: A ²³Na Solid-State Magic-Angle Spinning NMR Study