Organic sol comprising at least one oxygen composed of the earth (s), rare (s), the said ground and the use of the said ground for the catalysis

摘要

PCT No. PCT/FR96/01852 Sec. 371 Date Nov. 19, 1998 Sec. 102(e) Date Nov. 19, 1998 PCT Filed Nov. 22, 1996 PCT Pub. No. WO97/19022 PCT Pub. Date May 29, 1997A method for processing soot containing one or more rare earths, wherein said soot is contacted with an oxygen-containing gas, is disclosed. The method comprises (a) preparing an aqueous phase comprising a dispersion of at least one oxygenated metal compound; (b) simultaneously or consecutively contacting a suspension from step (a) with an organic phase including at least one amphiphilic agent and preferably an organic mixture or compound as the solvent; and +E,crc c+EE recovering the organic phase. Said oxygenated metal compound is produced by means of a method according to which a solution including at least one soluble rare-earth salt, usually an acetate and/or a chloride, is prepared; the solution is contacted with a basic medium and the resulting reaction mixture is maintained at a basic pH; and the precipitate formed by atomization or freeze-drying is recovered. Said method is useful in inorganic synthesis and catalysis.