Studies of the Hydrogen Held by Solids. VIII. The Decationated Zeolites

Uytterhoeven, Jan B.; Christner, L.; Hall, W. Keith

doi:10.1021/j100890a052

Cited by 452 publications

(154 citation statements)

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“…Heating the clay resulted in the development of a new band at 3440 cm -j, which was attributed to silanol groups in the tetrahedral layer. A similar observation was reported by Uytterhoeven et al (1965) and Ward (1967) upon heating NH4-Y zeolite. These authors proposed that during the thermal decomposition ofNH4 + ions, Si-O-AI bonds were broken by proton attack, as follows: Figure 5.…”

Section: Characterization O F the Synthetic Beidellitessupporting

confidence: 88%

Preparation and Characterization of Bidimensional Zeolitic Structures Obtained from Synthetic Beidellite and Hydroxy-Aluminum Solutions

Schutz

Stone

Poncelet

et al. 1987

Clays and clay miner.

147

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Abstract--Beidellite was synthesized hydrothermally from a noncrystalline gel at 320~ and 130 bar pressure. The beidellitic character of the product was verified by infrared spectroscopy on the NH4 § exchanged form. Intercalation was achieved with hydroxy-aluminum solutions having different OH/A1 molar ratios. The solutions were investigated by several methods, including 27A1 nuclear magnetic resonance. Essentially, two Al species were detected: monomeric A1 and a polymerized form containing A1 in four-fold coordination. This latter species was found to be selectively fixed in the interlamellar region, which resulted in a stable spacing of 18 ,~ at 110~ and 16.2 ~ at 700~ The pillared beidellites had specific surface areas of > 300 m2/g, mainly due to micropores. Both Br6nsted and Lewis acid sites were evidenced by infrared spectroscopy using pyridine as a probe molecule.

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Section: Characterization O F the Synthetic Beidellitessupporting

confidence: 88%

Preparation and Characterization of Bidimensional Zeolitic Structures Obtained from Synthetic Beidellite and Hydroxy-Aluminum Solutions

Schutz

Stone

Poncelet

et al. 1987

Clays and clay miner.

147

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“…In general, there are two typical models. One is by Uytterhoeven et al [25] (see in Scheme 1). They thought that the bridged hydroxyls on the zeolitic framework dehydrated to form the tricoordinated framework aluminum as the Lewis acid site, at the same time no dealumination of the zeolitic framework took place.…”

Section: Discussionmentioning

confidence: 99%

Characterization of the acid sites in dealuminated nanosized HZSM-5 zeolite with the probe molecule trimethylphosphine

Zhang

Han

Liu

et al. 2003

Journal of Molecular Catalysis A: Chemical

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“…Acidic behavior is inferred from the physical nature of the source. For example, Brdnsted acidity is inferred from protonic behavior as reflected by infrared spectroscopy (Uytterhoeven et al, 1965), n.m.r, spectroscopy (Trouillaux et al, 1968), or conductometric measurements (Fripiat et al, 1965).…”

Section: Introductionmentioning

confidence: 99%

An Ultraviolet Spectroscopic Method for Monitoring Surface Acidity of Clay Minerals under Varying Water Content

Bailey

1973

Clays and clay miner.

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The ability of a clay mineral surface to function as an acid is not represented by bulk pH measurements. A method using u.v. analysis and organic indicators has been developed to monitor surface acidity. The u.v. organic indicator method enables sensitive in situ quantification of surface-induced protonation in wet or dry clay systems. The clay preparation procedure used yields reproducible acidic behavior.

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Studies of the Hydrogen Held by Solids. VIII. The Decationated Zeolites

Cited by 452 publications

References 0 publications

Preparation and Characterization of Bidimensional Zeolitic Structures Obtained from Synthetic Beidellite and Hydroxy-Aluminum Solutions

Preparation and Characterization of Bidimensional Zeolitic Structures Obtained from Synthetic Beidellite and Hydroxy-Aluminum Solutions

Characterization of the acid sites in dealuminated nanosized HZSM-5 zeolite with the probe molecule trimethylphosphine

An Ultraviolet Spectroscopic Method for Monitoring Surface Acidity of Clay Minerals under Varying Water Content

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