Showing papers on "Calcium aluminates published in 1981"
TL;DR: In this paper, the kinetics of the formation of CaO and 3CaO were determined and the Ginstling-Brounshtein and Valensi-Carter equations fit the data quite well.
19 citations
TL;DR: In this article, the enthalpy and entropy values for solid calcium aluminates have been compared with activity measurements and the known phase diagram to obtain improved revised values and an accurate calculated phase diagram for this binary system.
Abstract: Enthalpy and entropy values for solid calcium aluminates have been compared with activity measurements and the known phase diagram to obtain improved revised values and an accurate calculated phase diagram for this binary system. The revised entropies (J mol/sup -1/ K/sup -1/) at 298/sup 0/K are 205.05 +- 0.8 for Ca/sub 3/Al/sub 2/O/sub 6/, 114.22 +- 0.8 for CaAl/sub 2/O/sub 4/, and 188.73 +- 0.8 for CaAl/sub 4/O/sub 7/. The excess enthalpy of mixing of CaO and AlO/sub 1/ /sub 5/ liquids has been calculated and plotted. Heats of fusion can be calculated from these values, but all the pure calcium aluminates melt incongruently.
16 citations
TL;DR: In this article, a study of the formation of several calcium aluminates, CaO.Al2O3, 12CaO.7Al 2O3 and 3CaOO.3, from pure components in the lime-sinter process was undertaken.
11 citations
TL;DR: In this article, the enthalpy and entropy values for solid calcium aluminates have been compared with activity measurements and the known phase diagram to obtain improved revised values and an accurate calculated phase diagram for this binary system.
Abstract: Enthalpy and entropy values for solid calcium aluminates have been compared with activity measurements and the known phase diagram to obtain improved revised values and an accurate calculated phase diagram for this binary system. The revised entropies (J mol/sup -1/ K/sup -1/) at 298/sup 0/K are 205.05 +- 0.8 for Ca/sub 3/Al/sub 2/O/sub 6/, 114.22 +- 0.8 for CaAl/sub 2/O/sub 4/, and 188.73 +- 0.8 for CaAl/sub 4/O/sub 7/. The excess enthalpy of mixing of CaO and AlO/sub 1/ /sub 5/ liquids has been calculated and plotted. Heats of fusion can be calculated from these values, but all the pure calcium aluminates melt incongruently.
2 citations
TL;DR: In this paper, the authors made a study of the mechanism of formation of catalysts; a special feature of this mechanism is the interaction of components (calcium aluminates and basic carbonates of cobalt and magnesium); the carrier with a developed surface and the active component distributed on this surface are formed during this process.
Abstract: A study was made of the mechanism of formation of catalysts; a special feature of this mechanism is the interaction of components (calcium aluminates and basic carbonates of cobalt and magnesium); the carrier with a developed surface and the active component distributed on this surface are formed during this process. Catalysts show maximum selectivity in synthesis of liquid hydrocarbons from CO and H/sub 2/ with a degree of reduction of the metal of 65-84% and a dispersion (according to chemisorption of CO) of 6 x 10/sup -3/ - 10 x 10/sup -3/. Maximum yield of liquid hydrocarbons (114.1 g/nm/sup 3/) was obtained in the pressure of a system of 33Co-3MgO-64 talum treated with hydrogen at 550/sup 0/C.