Amination catalytique de l'octanol en phase gazeuse Action de l'ion uranyle sur l'activité catalytique de la faujasite Y

Azzouz, Abdelkrim; Nibou, Djamel; Abbad, Brahim; Achache, M.

doi:10.1016/0304-5102(91)80074-d

Cited by 9 publications

(1 citation statement)

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“…The magnitude of the interaction occurring between the catalyst surface and the reactants was estimated by assessing the global acid character of the catalyst. The latter, defined as being the overall amount of both physically and chemically adsorbed butylamine, and expressed in terms of mmol Bu-NH 2 per gram of dry clay, was measured via titration in aprotic solvent (TAS), as reported elsewhere [24]. Thus, dry samples of gently ground clay catalysts were impregnated for 24 h with 0.1 M n-butylamine (Bu-NH 2 ) in anhydrous benzene, under continuous and vigorous stirring.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Ozonation of oxalic acid catalyzed by ion-exchanged montmorillonite in moderately acidic media

Azzouz

Kotbi

Niquette

et al. 2010

Reac Kinet Mech Cat

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Ion-exchanged montmorillonite-rich materials (ca. 96% purity) like NaMt, Fe(II)Mt, Co(II)Mt, Ni(II)Mt and Cu(II)Mt showed catalytic activity in the ozonation of oxalic acid in water at room temperature, in the pH range 3.4-6.0. The conversion of oxalic acid exceeds 95% after 180 min of ozone bubbling in the presence of Fe(II)Mt. The oxalic acid removal efficiency was found to increase swiftly with the acid character of the clay surface up to a certain level, but decreases gently with excessive surface acidity. The pH exerts a strong influence on the catalyst efficiency, because it induces changes in the composition of both the liquid media and catalyst. The synergic action of ozone and clay catalysts at acidic pH seems to involve ozone adsorption and interaction between cation and adsorbed oxalate. The negative effect of increasing pH between 3.44 and 6.0 is discussed in terms of a decrease in the amount and mobility of the cation in the vicinity of the clay surface, and of a decay in the clay surface area available to ozonation.

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Section: Catalyst Preparationmentioning

confidence: 99%