Methane or natural gas is a practical alternative fuel of vehicles. To develop more efficient technology of on-board storage, a possibility of using SBA-15 as the methane carrier is tested. An ordered mesoporous silica molecular sieve SBA-15 is synthesized aimed at collecting the data of methane sorption in the presence of water. The synthesized material is examined with SEM, TEM, and XRD analyses, and the hexagonal channel structure is confirmed. Its textual parameters are evaluated on the basis of the adsorption data for nitrogen at 77 K, and it gives the results of 802 m2/g for the specific surface area, 1.31 cm3/g for the pore volume, a narrow pore size distribution centered at 7.7 nm, and 4 nm for the width of the partition wall. Methane sorption isotherms on SBA-15 are collected with a volumetric method for samples of different contents of water, and the enhancement of the sorption capacity due to the presence of water is observed. A discussion on the mechanism of the sorption enhancement is presented.
Phase behaviors of aqueous biphasic systems (ABSs) composed of 1-butyl-3-methyl imidazolium tetrafluoroborate ([bmim]BF 4 ) + sucrose/maltose + water were reported in this work. Phase diagrams, including binodal curves, tie-lines, and the slope of tie-line (STL) were obtained at temperatures of T ) (278. 15, 288.15, 298.15, and 308.15) K. The binodal curve data were correlated using an empirical equation, and the tie-line data were correlated according to Othmer-Tobias and Bancroft equations. Good agreements with the experimental data were obtained, and results showed that these equations can be satisfactorily used to correlate the experimental data of the investigated systems at the given temperatures.
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