A study of the adsorption of acyclic polyols on hydrated alumina

Bronswijk, Wilhelm van; Watling, H.R.; Yu, Zheng

doi:10.1016/s0927-7757(99)00055-2

Cited by 34 publications

(26 citation statements)

References 7 publications

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“…According to this principle, a classification of polyol stereoisomers as a function of their complexing strength has been established by Angyal et al 26 In their work dealing with polyols adsorption, Van Bronswijk et al 13 show that the amount of polyols adsorbed on an alumina surface is related to their number of hydroxyl groups, and to their stereochemistry in agreement with previous assumptions. Such molecular configuration can be adopted by stereoisomers containing threo-threo sequences with lower energy cost, whereas it is not favored for those containing erythro sequences because of steric hindrance.…”

Section: Polyol Surface Interactionsmentioning

confidence: 62%

“…9,12,13 These effects have been attributed by the co-workers to specific interactions of surface aluminium atoms with the organic additives. 13 Polyols were thus shown to exhibit various levels of complexing ability, directly related to molecules topology and configuration. Results have shown that the relative adsorption of polyols is stronger for those with longer carbon chain (and thus with higher number of vicinal hydroxyl groups), and depending on the molecule stereochemistry.…”

Section: Introductionmentioning

confidence: 99%

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Use of polyols as particle size and shape controllers: application to boehmite synthesis from sol–gel routes

Chiche

Chanéac

Revel

et al. 2011

Phys. Chem. Chem. Phys.

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Polyols were successfully used as size and shape controllers of oxide nanoparticles synthesized by soft chemistry in aqueous solution. The efficiency of acyclic polyols as a complexing agent depends obviously on the number of OH groups bonded to the carbon chain (and thus on the carbon chain length), but also on their stereochemistry. This innovating way to control morphology has been experienced for the synthesis of boehmite nanoparticles, whose morphology variations related to xylitol adsorption (C5 alditol) have been previously reported. The use of polyols during synthesis causes a modification of the usual morphologies observed, specifically resulting in an increase of (101) faces area. It is evidenced here that the variations of the nanoparticle aspect ratio are related to polyol complexing ability, and more specifically to molecule topology and configuration. Indeed, the morphology variations increase as a function of polyol carbon chain length and number of hydroxyl groups, and is much pronounced for stereoisomers exhibiting hydroxyl groups all oriented on the same side of the molecule (threo-threo sequences). Thanks to these various polyols used, we showed how the progressive levels of complexing ability allow us to tune boehmite particle size and shape. Material characterizations were performed using relevant methods such as X-ray diffraction powder pattern simulation and zetametry in addition to transmission electron microscopy. Since γ-alumina is obtained from boehmite by a topotactic transformation, we expect that this method will provide a promising way to control surface properties of γ-alumina, an important industrial catalyst support.

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Section: Polyol Surface Interactionsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Use of polyols as particle size and shape controllers: application to boehmite synthesis from sol–gel routes

Chiche

Chanéac

Revel

et al. 2011

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…Experiments on a series of alditols by van Bronswijk et al (1999) revealed clear relationships between structure, adsorption and precipitation yield. In particular, the compounds studied were found to fall into distinct two groups based on the key stereochemical characteristic of threo (alternating hydroxyls) or erythro (hydroxyls all on same side), as shown in Fig.…”

Section: Aliphatic Poly-hydroxy Compounds-the Alditolsmentioning

confidence: 99%

“…Under this model, the relative strengths of inhibitors are seen as resulting from the relationship of the structure and stereochemistry of an inhibitor to its ability to adsorb to the gibbsite surface (van Bronswijk et al, 1999;Watling, 2000), in which the aluminium ions are octahedrally co-ordinated. However from the available information it does not appear to be possible to distinguish between adsorption of the organic compounds themselves and adsorption of an organic/ aluminate complex.…”

Section: Aliphatic Poly-hydroxy Compounds-the Alditolsmentioning

confidence: 99%

“…A number of studies have established a link between organic compounds in solution and the incorporation of soda into precipitated gibbsite (Armstrong et al, 1996;Clerin and Cristol, 1998;Grocott and Rosenberg, 1988;van Bronswijk et al, 1999;Watling et al, 1996). Grocott and Rosenberg (1988) demonstrated a linear relationship between incorporated soda and the fraction of Bayer plant liquor in synthetic liquor/plant liquor mixtures.…”

Section: Soda In Productmentioning

confidence: 99%

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