层柱催化剂［Zn_2Al（OH）_2］［SiW_（11）O_（39）Co（H_2

New Route for Preparation of Layer-pillared Catalyst[Zn_2Al(OH)_2][SiW_(11)O_(39)Co(H_2O)]_(0.83)·4H_2O and Its Catalytic Activities for the Oxidation of Benzaldehyde Using H_2O_2 as Oxidant

层柱催化剂［Ｚｎ_２Ａｌ（ＯＨ）_２］［ＳｉＷ_（１１）Ｏ_（３９）Ｃｏ（Ｈ_２Ｏ）］_（０．８３）４Ｈ_２Ｏ的合成新途径及其对苯甲醛Ｈ_２Ｏ_２氧化的催化活性胡长文，贺庆林，张云峰，张继余，王恩波（东北师范大学化学系，长春１３００２４）关键词层柱催化剂，苯?..

The Keggin structure of tungstosilicatic heteropolyanion substituted with Co2+,SiW11O39Co(H2O)6-,have been intercalated into the interlayer of Zn2Al hydrotalcite by means of organic-anionpillared precusor.Zn2AISiW11Co was characterized by XRD,IR and elementary analysis.The results show that Zn2AlSiW11Co is a layered complex with gallery height of 0.95 nm and the anions enterring the layer retain the Keggin structure.It was shown that this kind of pillared layered catalyst had high activity and selectivity for the oxidation of benzaldehyde to benzoic acid using H2O2as oxidant in liquid-solid phase system.