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. ...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.展开更多
A supported amorphous Ru-Co/ZrO 2 catalyst was prepared by using formaldehyde as reduetant. The amorphous character of the catalyst was estimated by XRD, TG-DTA and SEM. The amorphous Ru-Co/ZrO 2 catalyst has higher s...A supported amorphous Ru-Co/ZrO 2 catalyst was prepared by using formaldehyde as reduetant. The amorphous character of the catalyst was estimated by XRD, TG-DTA and SEM. The amorphous Ru-Co/ZrO 2 catalyst has higher selectivity than Ru/ZrO 2 in the selective hydrogenation of benzene to cyclohexene when the experiments were run in simulated production conditions. Presence of Co in the catalyst favored the selectivity of Ru-Co/ZrO 2 but decreased its activity.展开更多
Complex Cobalt(III) di[N-(p-methyl)phenyl-2 -pyridinecarboxamide] dihydrate chloride [Co(p-Me-PPA)2(H2O)2] Cl hadbeen synthesised. The single crystal strUcture of the metal complex had been successfully prepared and d...Complex Cobalt(III) di[N-(p-methyl)phenyl-2 -pyridinecarboxamide] dihydrate chloride [Co(p-Me-PPA)2(H2O)2] Cl hadbeen synthesised. The single crystal strUcture of the metal complex had been successfully prepared and determined by fourcircle single crystal diffractometer. When the oxidation of cyclohexene was catalyzed by [Co(p-Me-PPA)2(H2O)2]Cl withmolecular oxygen as oxidant, the conversion reached 59% , the selectivity of cyclohexenone being 75%.展开更多
The Complex of the ligands containing pyridinecarboxamide with Mn2+, Fe3=,Ru3+ had been Synthesized. The composition andstructure of the metal complex had been determined by UV, IR.TG, XPS and elemental analysis .When...The Complex of the ligands containing pyridinecarboxamide with Mn2+, Fe3=,Ru3+ had been Synthesized. The composition andstructure of the metal complex had been determined by UV, IR.TG, XPS and elemental analysis .When the oxidation of cyclohexenewas catalyzed by the complexes with oxygen as oxided, the conversion reached 45.7%, the seleCtivity of cyclohexenone is 64.6%.Ruthenium complexes exhibits better selectivity for 1,2-cyclohexene oxide.展开更多
The RuCoB/ZrO2 catalyst was prepared by chemical reduction method,in which Ru was an active component,Co was a promoter and ZrO2 was a dispersant.The influences of the different contents of Co and ZrO2 and t...The RuCoB/ZrO2 catalyst was prepared by chemical reduction method,in which Ru was an active component,Co was a promoter and ZrO2 was a dispersant.The influences of the different contents of Co and ZrO2 and the different reducing agents on the catalytic characteristics were studied.The results indicated that the characteristics of the catalysts reduced by KBH4 were better than that by formaldehyde.When Co/Ru ratio was 2% and Ru/ZrO2 ratio was 13%,the snythetically catalytic characteristics of RuCoB/ZrO2 was the best, and γ40 and S40 reached 14239h-1 and 758%, respectively.展开更多
文摘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.
文摘A supported amorphous Ru-Co/ZrO 2 catalyst was prepared by using formaldehyde as reduetant. The amorphous character of the catalyst was estimated by XRD, TG-DTA and SEM. The amorphous Ru-Co/ZrO 2 catalyst has higher selectivity than Ru/ZrO 2 in the selective hydrogenation of benzene to cyclohexene when the experiments were run in simulated production conditions. Presence of Co in the catalyst favored the selectivity of Ru-Co/ZrO 2 but decreased its activity.
文摘Complex Cobalt(III) di[N-(p-methyl)phenyl-2 -pyridinecarboxamide] dihydrate chloride [Co(p-Me-PPA)2(H2O)2] Cl hadbeen synthesised. The single crystal strUcture of the metal complex had been successfully prepared and determined by fourcircle single crystal diffractometer. When the oxidation of cyclohexene was catalyzed by [Co(p-Me-PPA)2(H2O)2]Cl withmolecular oxygen as oxidant, the conversion reached 59% , the selectivity of cyclohexenone being 75%.
文摘The Complex of the ligands containing pyridinecarboxamide with Mn2+, Fe3=,Ru3+ had been Synthesized. The composition andstructure of the metal complex had been determined by UV, IR.TG, XPS and elemental analysis .When the oxidation of cyclohexenewas catalyzed by the complexes with oxygen as oxided, the conversion reached 45.7%, the seleCtivity of cyclohexenone is 64.6%.Ruthenium complexes exhibits better selectivity for 1,2-cyclohexene oxide.
文摘The RuCoB/ZrO2 catalyst was prepared by chemical reduction method,in which Ru was an active component,Co was a promoter and ZrO2 was a dispersant.The influences of the different contents of Co and ZrO2 and the different reducing agents on the catalytic characteristics were studied.The results indicated that the characteristics of the catalysts reduced by KBH4 were better than that by formaldehyde.When Co/Ru ratio was 2% and Ru/ZrO2 ratio was 13%,the snythetically catalytic characteristics of RuCoB/ZrO2 was the best, and γ40 and S40 reached 14239h-1 and 758%, respectively.
