New Triphase Catalysts from Montmorillonite

Choudary, B. M.; Rao, Y. V. Subba; Prasad, B. Prabhu

doi:10.1346/ccmn.1991.0390314

Cited by 20 publications

(10 citation statements)

References 12 publications

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“…Clays and zeolites can also act as efficient, inexpensive, stable, and recyclable catalyst supports. Clays (Cornelius and Laszlo, 1982;Sarkar et al, 1989;Choudhary et al, 1991;Lin and Pinnavaia, 1991) especially seem to be feasible for commercial exploitation due to their low costs. The negatively charged sheets in clays like montmorillonite can act as effective counterions for the quaternary salt cations.…”

Section: Immobilized Phase-transfer Catalystsmentioning

confidence: 99%

Phase transfer catalysis: Chemistry and engineering

1998

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Section: Immobilized Phase-transfer Catalystsmentioning

confidence: 99%

Phase transfer catalysis: Chemistry and engineering

1998

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“…Recently Choudary et al reported new triphase catalysis from montmorillonite . This report indicated that clay hydroxyl groups treated with (3-aminopropyl)triethoxysilane or (3-chloropropyl)trimethoxysilane reacted with methyl iodide or pyridine or tributhylamine as below: Motivated by the above results, we synthesized saponite−(3-aminopropyl)dimethylethoxysilane−alkanoyl chlorides as clay−organic complexes.…”

Section: Introductionmentioning

confidence: 85%

Formation of Thin Films of Clay−Organic Complexes with an Application as an Electrode Modifier

et al. 1996

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A thin film was formed by spreading a chloroform dispersion of a hydrophobic clay-organic complex at an air-water interface. The clay-organic complexes were prepared by reacting synthetic saponite with 3-(aminopropyl)dimethylethoxysilane and thereafter with alkanoyl chlorides. From the analysis of surface pressure-area curves, it was concluded that the film were composed of 1-3 layers of clay crystallites. The film was repeatedly transferred onto a glassy carbon electrode to build up 30 layers by the Langmuir-Blodgett method. An electrode modified with the clay multilayer was found to be electroactive when it was soaked in an aqueous solution of [Ru(bpy) 3]Cl2 (1 × 10 -5 M) and Na2SO4 (0.05 M).

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“…The chromophores were protonated by acid treatment and then intercalated into the silicate galleries by an ion-exchange process. 32 At first, a cosolvent of equal volume mixture of HCl and methanol [HCl (aq) /methanol] was prepared. Chromophore (DO3, diazo-DO3, and p-NA) was protonated by dissolving it in the prepared cosolvent at 60°C.…”

Section: Preparation Of [Chromophore] ؉ -Saponitesmentioning

confidence: 99%

Synthesis and structural characterizations of [chromophore]⁺‐saponite/polyurethane nanocomposites

Wang

Chin

Wang

2002

J Polym Sci B Polym Phys

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In this study, three chromophores-p-nitroaniline, 4-(4-nitrophenylazo)aniline, and 4-[(E)-2-{4-[(E)-2-(4-nitrophenyl)-1-diazenyl]phenyl}-1-diazenyl]anilinewere intercalated into layered aluminosilicate saponite and then dispersed into the polyurethanes matrix. The intercalated chromophore/saponite complexes were examined by inductively coupled plasma emission and element analysis technologies. The molecular orbital package computation simulation and X-ray diffraction (XRD) analysis showed that possible configurations of chromophore ions on the gallery surfaces of saponite suggest that the chromophore molecules lie parallel to the basal planes of silicate as an inclined paraffin structure or as pseudo-multilayers. The XRD and transmission electron microscopy analysis indicated that the delamination of organoclay in the polyurethanes matrix exhibited nanolayers, exfoliated structure, or both. In particular, even at high doping levels up to 15 wt % of organoclay, the [chromophore] ϩsaponite/polyurethanes film did not display a macroscopic aggregation of layered silicates and showed high transparency. The thermal stability of chromophore was significantly enhanced as intercalated into the layered aluminosilicate saponite, and the glass-transition temperature of [chromophore] ϩ -saponite/polyurethanes nanocomposites proportionally increased with increased clay content.

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New Triphase Catalysts from Montmorillonite

Cited by 20 publications

References 12 publications

Phase transfer catalysis: Chemistry and engineering

Phase transfer catalysis: Chemistry and engineering

Formation of Thin Films of Clay−Organic Complexes with an Application as an Electrode Modifier

Synthesis and structural characterizations of [chromophore]⁺‐saponite/polyurethane nanocomposites

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New Triphase Catalysts from Montmorillonite

Cited by 20 publications

References 12 publications

Phase transfer catalysis: Chemistry and engineering

Phase transfer catalysis: Chemistry and engineering

Formation of Thin Films of Clay−Organic Complexes with an Application as an Electrode Modifier

Synthesis and structural characterizations of [chromophore]+‐saponite/polyurethane nanocomposites

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Synthesis and structural characterizations of [chromophore]⁺‐saponite/polyurethane nanocomposites