Catalytic Oxidation of Cyclohexene over Transition Metal Substituted Polyoxometalate Pillared Layered Double Hydroxides

Abstract

Abstract: POM-LDHs with the composition of MAI-XW₁₁ZO₃₉(M=Zn, Mg; X=P, Si; Z=Mn²⁺, Fe²⁺, Co²⁺, Ni²⁺, Cu²⁺) were synthesized, and their catalytic properties for oxidation of cyclohexene in the presence of dioxygen were studied. The results obtained show that the oxidation of cyclohexene gives mainly α-H oxidation products, and the reaction activities greatly depend on the nature of the substituted transition metals in the POM pillars, i. e.,with different Z ions, the activity is in the order: Co²⁺～Cu²⁺～Mn²⁺》Ni²⁺～Fe²⁺. In addition, the central atom in the POM pillars has some effects on the oxidation of cyclohexene.The activity increases when P is used instead of Si. No obvious difference between the activities of ZnAl and MgAl layers were observed.

Key words: Polyoxometalates, Pillared layered double hydroxides, Cyclohexene, Catalytic oxidation

CLC Number:

O643.1

TrendMD:

GUO Jun, JIAO Qing-Ze, DUAN Shu-Hong, JIANG Da-Zhen, MIN En-Ze. Catalytic Oxidation of Cyclohexene over Transition Metal Substituted Polyoxometalate Pillared Layered Double Hydroxides[J]. Chem. J. Chinese Universities, 1998, 19(1): 129.

References

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