| 摘要 |
The invention relates to a method for obtaining a magnesium-aluminium mixed oxide (MgOAl) from the reaction between particles of the magnesium-aluminium alloy (MgAl) and oxygen (O2), said method involving a reaction between a solid and a gas at a certain normal temperature and pressure. The magnesium-aluminium alloy (MgAl) has a composition of 10 wt % to 90 wt % of magnesium (Mg) and 10 wt % to 90 wt % of aluminium (Al), the oxygen (O2) is obtained from the argon (Ar), helium (He), nitrogen (N2), and hydrogen (H2) gases that contain same as an impurity with a concentration of 3 to 5 parts per million (ppm), also being obtained from the atmospheric air. The magnesium-aluminium mixed oxide (MgOAl) was initially obtained in a thermogravimetric system (TGA) and then in a tube furnace, but can also be obtained in any type of furnace or muffle; the temperature at which the mixed oxide is obtained ranges from ambient temperature to 700 °C during a time from 0.5 to 5 hours or until the reaction ends, said procedure producing a bulky, porous, low-density, dark grey compound that is similar to a calcined hydrotalcite (HT) compound, having physical and chemical properties that are different to those of a commercially available hydrotalcite (HT); the magnesium-aluminium mixed oxide (MgOAl) is obtained with 5 to 50 times the volume of the particles of the alloy (MgAl) with the aforementioned percentages. Hydrogen (H2), non-calcined hydrotalcite (HT) and aluminium hydroxide (Al(OH)3) are also obtained in a single step, by reacting the mixed magnesium-aluminium oxide (MgOAl) with water (H2O) and/or an aqueous solution of urea or any type of combination of solvents with water (H20) at low temperatures; said oxide also absorbs various types of gases, volatile compounds and moisture, both under normal pressure and temperature conditions and under certain pressure and temperature conditions in the event of absorbing hydrogen (H2) in a microreactor. |
