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- W2300374485 abstract "Thermal conversions of systems prepared by impregnation of aluminium hydroxides (boehmite, bayerite, hydrargillite)*and γ-Al2O3 with chromic acid solutions, their catalytic activity in the low-temperature hydrogenation of ethylene at various stages of heating and their thermal stability at high calcination temperatures were studied. The pre-supports and γ-Al2O3 prevent the thermal decomposition of the impregnated CrO3 to various extents. The maximum decomposition temperatures of CrO3 supported on γ-Al2O3, hydrargillite, bayerite and boehmite were observed to increase, the difference between these temperatures for γ-Al2O3 and boehmite exceeding 100°C. Chromia-alumina catalysts attain their maximum activity in the low-temperature hydrogenation of ethylene after activation in vacuo at 800 to 900°C. The higher the chromia concentration, the greater is the activity of boehmite and bayerite catalysts, 10 to 15 wt.-% of Cr2O3 providing maximum activities of hydrargillite- and γ-Al2O3-supported catalysts. The stabilizing effect of aluminium oxide with regard to the supported Cr2O3 decreases drastically after calcination above the Tamman temperature (1000°C for Al2O3). Both the unsupported Cr2O3 and chromia-alumina catalysts are deactivated after calcination at the Tamman temperature (1200°C for Cr2O3)." @default.
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- W2300374485 date "1976-01-01" @default.
- W2300374485 modified "2023-10-16" @default.
- W2300374485 title "Study of the Activation and Thermal Stability of Chromia-Alumina Catalysts" @default.
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- W2300374485 doi "https://doi.org/10.1016/s0167-2991(08)63968-3" @default.
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