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- W2016088377 abstract "The purpose of this study was to investigate the effect of increasing chromium concentration on the activity and physical properties of chromia/alumina catalysts. The catalysts were prepared by impregnating η-alumina support in various concentrations of chromic acid solution and were finally calcined in air. A variety of physical-chemical properties of the catalysts were studied. These included BET surface area, pore volume, metal concentration, x-ray diffraction studies, oxidation states using EPR, surface oxidation (excess oxygen) measurement by iodometric titration, metal area measurement and crystallite size determination. Decomposition of hydrogen peroxide was used to determine the activity of various catalysts. A correlation of catalytic activity with crystallite size indicated that both, activity per unit chromia area and activity per g of catalyst were maximum at a crystallite size of 3.7 mm. Also, the activity per unit chromia area is maximum when chromia is deposited 3-4 layers thick. In contradiction to the view put forth in the literature, this study indicates (on the basis of excess oxygen and chemisorption measurement) that not only is all of the top chromium oxidized to Cr6 but that the oxidation also takes place in the sub-surface layer(s). On a étudié l'effet de la concentration du chrome sur l'activité et les propriétés physiques de catalyseurs oxyde de chrome/alumine. On a préparé les catalyseurs par imprégnation d'un support d'alumnie-η dans une solution d'acide chromique de différentes concentrations, suivie d'une calcination à l'air. On a étudié un certain nombre de propriétés physico-chimiques des catalyseurs obtenus, entre autres (a) l'aire de la surface BET; (b) le volume des pores; (c) la concentration du métal; (d) la diffraction des rayons-X; (e) les états d'oxydation (en employana la RPE); (f) l'oxydation superficielle (excès d'oxygène) mesurée par titrage iodométrique; (g) la mesure de la surface métallique; (i) la détermination des dimensions des cristallites. On a eu recours à la décomposition du peroxyde d'hydrogène pour déterminer l'activité des divers catalyseurs. Une corrélation de l'activité catalytique avec les dimensions des cristallites a indiqué qu' la fois l'activité par unité de surface de l'oxyde de chrome et celle par gramme du catalyseur étaient maximales lorsque la dimension des cristallites était 3.7 inn. l'activité par unité de surface de l'oxyde de chrome était aussi maximale lorsque l'épaisseur du dépôt d'oxyde était de 3 à 4 couches moléculaires. Contrairement au point de vue émis dans la littérature, cette étude indique (en se basant sur la mesure de l'oxygène en excès et de la chimisorption) non seulement que toute la couche supérieure de chrome est oxydée à Cr8+, mais que l'oxydation se fait aussi dans la on les couches sousjacentes." @default.
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- W2016088377 date "1980-10-01" @default.
- W2016088377 modified "2023-09-28" @default.
- W2016088377 title "Study of chromia alumia catalysts" @default.
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- W2016088377 doi "https://doi.org/10.1002/cjce.5450580509" @default.
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