Hydrothermal synthesis method was adopted to prepare a highly active Ga 2 O 3 -Al 2 O 3 catalyst (GA-HS), which displayed superior catalytic performance for dehydrogenation of propane to propylene in the presence of CO 2 (DHP-CO 2 ). The highest propane conversion on GA-HS was 35.2%, which was much higher than the catalysts prepared using grind-mixture method (8.7%) or coprecipitation method (26.2%). 10 Moreover, propylene selectivity over GA-HS catalyst was higher than that over other catalysts in a period of 9 h reaction. These catalysts were characterized by N 2 physical adsorption, ICP-AES, XRD, TGA, TEM, SEM, DRIFT, Py-FTIR, NH 3 -TPD, XPS, 27 Al MAS NMR and 71 Ga MAS NMR techniques. The characterization data indicated that hydrothermal treatment increased the surface area, expanded the pore size and promoted the formation of more tetrahedral Ga ions and generation of more medium-strong 15 Lewis acid sites. Furthermore, this catalyst mainly displayed amorphous sponge-like morphology as well as a new morphology that some pieces were covered with amorphous nanoparticles. The superior activity of GA-HS was attributed to higher surface area of this catalyst and larger amount of tetrahedral Ga ions (Ga 3+ and probably Ga δ+ δ< 2) related to medium-strong Lewis acid sites. 65 75
The solubility of artemisinin in pure methanol, ethyl acetate, acetone, acetonitrile, cyclohexane, toluene, and chloroform was measured by a synthetic method over the temperature range from (283.15 to 323.15) K at atmospheric pressure. The results show that the solubility of artemisinin increases with increasing temperature in all seven solvents. The experimental data were correlated using the modified Apelblat model, and the agreement with the experimental data was very good.
The solubility of valsartan in ethyl acetate + hexane binary mixtures was measured by a synthetic method over the temperature range from (278.15 to 313.15) K at atmosphere pressure. The results show that the solubility of valsartan increases with increasing temperature and the increasing mole fraction of ethyl acetate of the binary mixtures. The experimental data were correlated using the modified Apelblat model, and the agreement with the experimental data was very good.
The solubility of valsartan in pure methyl acetate, n-butyl acetate, acetonitrile, N,N-dimethylformamide, dichloromethane, chloroform, and ethanol + water binary mixtures was measured by a synthetic method over the temperature range (278.15 to 313.15) K at atmospheric pressure. The results show that the solubility of valsartan increases with increasing temperature in all six pure solvents and ethanol + water binary mixtures, and it increases with increasing mole fraction of ethanol in the binary mixtures. The experimental data were correlated using the modified Apelblat model, and the agreement with the experimental data was very good.
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