-Hydrotalcite-like compounds, [Mg~ _xAlx(OH)2] x+ [xX-. n H20], where X= 1/2 CO32or OH , were prepared by hydrothermal syntheses at Pnzo = 100 MPa and T = 100~176 Starting materials were MgO, "y-A1203, H20 , and MgC204" 2H20. The synthesis depended on temperature, pressure, the A1/(A1 + Mg) ratio x, and the CO2 content of the starting material. Previously an A1 content of x = 0.33 was thought t...
