摘要
TRANSITION element trisubstituted and Ln bi-(1:11)series heteropolyanion with Keggin struc-ture are excellent catalyst with oxidizing properties.But they have some shortcomingssuch as poor stability and impossible recycle use when they are used in homogeneous oxidation.Anions(A<sup>n</sup>-),among hydroxides(LDHS)-like layers,having a general formula[M<sub>1-x</sub><sup>2+</sup>M<sub>x</sub><sup>3+</sup>-