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- W2080374015 abstract "Y-faujasite previously impregnated with aqueous wastes containing mainly UO 2 2+ cations ( ca 1000 ppm) showed interesting catalytic activities in n-octanol-1 amination. The reaction was run in gas phase and the catalytic performances were investigated at the following operating conditions: temperature range, 250–500 °C; normal pressure; ROH:NH 3 mole ratio, 0.4–6; WHSV, 1.3–7.4 h −1 ; carrier gas, 0.25 ml s −1 of helium and 5 g of fixed bed catalyst. TDA patterns and IR spectra of NaUO 2 Y catalysts were compared with those of similar catalysts containing H + , Sr 2+ , Co 2+ , Tl + , Pb 2+ , La 3+ or Ce 3+ cations. It results that UO 2 2+ cation presents the same features than those of any other cation, i.e. it is a precursor of Brönsted acidic sites. It was also postulated that uranyl ion does not decompose into uranium dioxide UO 2 . The activity and selectivity were correlated as being strongly dependent on percent Na substitution and consequently proportional to surface acidity. The main products are mono(MOA), di(DOA) and trioctylamine(TOA) but the primary amine was predominant. The effects of the reaction temperature and of ROH:NH 3 mole ratio are also discussed. Une faujasite de type Y préalablement imprégniée avec des effluents aqueux contenant principalement des cations UO 2 2+ (environ 1000 ppm) a présenté des activités catalytiques intéressantes dans l'amination du n-octanol-1. La réaction est réalisée en phase gazeuse et les performances catalytiques ont été étudiées aux conditions opératoires suivantes: température, 250–500 °C; pression atmosphérique; rapport molaire ROH:NH 3 , 0,4–6; WHSV, 1,3-7,4 h −1 ; gaz vecteur: 0,25 ml s −1 d'helium et 5 g de lit fixe de catalyseur. Les diagrammes ATD et les spectres IR des catalyseurs NaUO 2 Y ont été comparés à ceux de catalyseurs similaires contenant des cations H + , Sr 2+ , Co 2+ , Tl + , Pb 2+ , La 3+ ou Ce 3+ . Il en résulte que le cation UO 2 2+ présente les mêmes caractéristiques que celles des autres cations. Il est responsable de la formation de sites acides du type Brönsted. De même, il est admis que l'ion uranyle ne se décompose pas en bioxyde d'uranium UO 2 . L'activité et la sélectivité semblent dépendre grandement du taux d'échange du sodium et, par conséquent, de l'acidité de surface. Les principaux produits sont la mono(MOA), di(DOA) et trioctylamine(TOA) mais l'amine primaire est prépondérante. Les effets de la température de réaction et du rapport molaire ROH:NH 3 ont été d également examinés." @default.
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- W2080374015 date "1991-09-01" @default.
- W2080374015 modified "2023-10-17" @default.
- W2080374015 title "Amination catalytique de l'octanol en phase gazeuse Action de l'ion uranyle sur l'activité catalytique de la faujasite Y" @default.
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- W2080374015 doi "https://doi.org/10.1016/0304-5102(91)80074-d" @default.
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