The dinuclear complex [VO（L）]2（μ-O）（H2L=salicylaldehyde benzoylhydrazone） was synthesized and characterized by elemental analysis, IR, UV, cyclic voltammetry. The results showed that two oxygen atoms and one ni...The dinuclear complex [VO（L）]2（μ-O）（H2L=salicylaldehyde benzoylhydrazone） was synthesized and characterized by elemental analysis, IR, UV, cyclic voltammetry. The results showed that two oxygen atoms and one nitrogen atom of the tridentate hydrazone ligand are coordinated to vanadium（Ⅴ） atom. The vanadium atom approximates to a distorted square pyramidal coordination sphere. The redox potentials of the title complex in different solvents follow the order: CH2Cl2<CH3CN<DMF.展开更多
Au/Co3O4/CeO2 materials are prepared using conventional deposition-precipitation method. The effects of calcination temperatures and pretreatment conditions on the catalytic performance of Au/Co3O4/CeO2 for CO low-tem...Au/Co3O4/CeO2 materials are prepared using conventional deposition-precipitation method. The effects of calcination temperatures and pretreatment conditions on the catalytic performance of Au/Co3O4/CeO2 for CO low-temperature oxidation in humid circumstance are investigated. The sample calcines at 443 K in flowing air exhibited good activity and stability for CO oxidation. 80% CO conversion rate can be achieved after 3 000 min with a feed gas contained 3.1%(φw) of water vapor. The physical and chemical properties of the Au/Co3O4/CeO2 samples are characterized by X-ray diffraction (XRD),temperature-programmed reduction (H2-TPR),and transmission electron microscopy (TEM) techniques. The characterized results show that the prepared material calcined at 443 K has a weak diffraction peak of gold species observed by XRD,the grain diameter of 3 nm by TEM and best redox property and the highest activity for CO oxidation by H2-TPR at prope calcined temperature.展开更多
基金supported by the Natural Science Foundation of Guangdong Province, China (5005938)Research Foundation of Education Bureau of Guangdong Province, China (2007A090302046)~~
文摘The dinuclear complex [VO（L）]2（μ-O）（H2L=salicylaldehyde benzoylhydrazone） was synthesized and characterized by elemental analysis, IR, UV, cyclic voltammetry. The results showed that two oxygen atoms and one nitrogen atom of the tridentate hydrazone ligand are coordinated to vanadium（Ⅴ） atom. The vanadium atom approximates to a distorted square pyramidal coordination sphere. The redox potentials of the title complex in different solvents follow the order: CH2Cl2<CH3CN<DMF.
文摘Au/Co3O4/CeO2 materials are prepared using conventional deposition-precipitation method. The effects of calcination temperatures and pretreatment conditions on the catalytic performance of Au/Co3O4/CeO2 for CO low-temperature oxidation in humid circumstance are investigated. The sample calcines at 443 K in flowing air exhibited good activity and stability for CO oxidation. 80% CO conversion rate can be achieved after 3 000 min with a feed gas contained 3.1%(φw) of water vapor. The physical and chemical properties of the Au/Co3O4/CeO2 samples are characterized by X-ray diffraction (XRD),temperature-programmed reduction (H2-TPR),and transmission electron microscopy (TEM) techniques. The characterized results show that the prepared material calcined at 443 K has a weak diffraction peak of gold species observed by XRD,the grain diameter of 3 nm by TEM and best redox property and the highest activity for CO oxidation by H2-TPR at prope calcined temperature.
