| 摘要 |
<p>A process for the preparation of nanocrystalline hydrotalcite compounds is disclosed which comprises the steps: introduction of one or more starting compounds into a reaction chamber by means of a carrier fluid, subjecting the starting compound(s) in a treatment zone in a Helmholtz resonator to a pulsating thermal treatment at a temperature of 250 to 400{C, formation of nanocrystalline hydrotalcite particles, discharging of the nanocrystalline hydrotalcite particles from the reactor, wherein the starting compound(s) are introduced into the reaction chamber in the form of a solution, slurry, suspension or in solid aggregate state. The starting compounds may be carbonates, hydroxides, nitrates or sulphates of magnesium, zinc, calcium, aluminium, nickel, manganese or iron. The carrier fluid may be water. Also disclosed is a hydrotalcite material characterized by a crystallite size in the range 10 nm to 10 microns. The material may be used as an adsorption and/or catalyst material.</p> |
