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 catalysts of nanometer TiO 2/BuOH and hydrous TiO 2 were prepared by the liquid phase method from Ti(SO 4) 2. The properties of the catalysts were characterized by TG DTA, IR, XRD, TEM methods. The results showed ...The catalysts of nanometer TiO 2/BuOH and hydrous TiO 2 were prepared by the liquid phase method from Ti(SO 4) 2. The properties of the catalysts were characterized by TG DTA, IR, XRD, TEM methods. The results showed that nanometer TiO 2/BuOH was anatase particles with 10 nm×20 nm. The main product in styrene epoxidation with t butyl hydroperoxide(TBPH) was styrene epoxide, by product was phenylformaldehyde under the condition of 80 ℃ for 6 h. Hydrous TiO 2 prepared below 260 ℃ was non crystal powder and converted into anatase particles with 10 nm×300 nm when it was roasted at 500 ℃ . The catalytic activity of 10 nm×300 nm anatase particles had only 50% that of particles with 10 nm×20 nm. The centers of acid on the catalyst surface made the epoxide selectivity decrease obviously. The order of the influence of solvent on epoxidation reaction: 1,2 dichloroethane>butanol>cyclohexanone>methyl cyclohexane>cyclohexanol>acetic acid.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 nanometer TiO 2 and nanometer TiO 2/EtOH catalysts were prepared from Ti(SO 4) 2 by the liquid phase method. The properties of these catalysts were characterized using TG DTA, IR, XRD and TEM methods.. The results...The nanometer TiO 2 and nanometer TiO 2/EtOH catalysts were prepared from Ti(SO 4) 2 by the liquid phase method. The properties of these catalysts were characterized using TG DTA, IR, XRD and TEM methods.. The results show that both TiO 2 and TiO 2/EtOH are anatase with the particle sizes of about 60 nm possessing excellent thermal stability. The activities and selectivities of catalysts in styrene epoxidation with t butyl hydroperoxide (TBPH) were examined and the influence of different solvents on catalytic performance was examined. When the oxidation is carried out under suitable conditions, the main product and byproduct are styrene peroxide and phenylformaldehyde, respectively. The conversion of styrene and selectivity to epoxide over nanometer TiO 2/EtOH catalyst are 34.7% and 60.0% , respectively. When cyclohexanone or 1,4 dioxane are used as solvents, the selectivity to epoxide is more than 70%. The ethanol supported nanometer TiO 2 improved the activity obviously and the suitable solvents increased the selectivity to epoxide.展开更多
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 catalysts of nanometer TiO 2/BuOH and hydrous TiO 2 were prepared by the liquid phase method from Ti(SO 4) 2. The properties of the catalysts were characterized by TG DTA, IR, XRD, TEM methods. The results showed that nanometer TiO 2/BuOH was anatase particles with 10 nm×20 nm. The main product in styrene epoxidation with t butyl hydroperoxide(TBPH) was styrene epoxide, by product was phenylformaldehyde under the condition of 80 ℃ for 6 h. Hydrous TiO 2 prepared below 260 ℃ was non crystal powder and converted into anatase particles with 10 nm×300 nm when it was roasted at 500 ℃ . The catalytic activity of 10 nm×300 nm anatase particles had only 50% that of particles with 10 nm×20 nm. The centers of acid on the catalyst surface made the epoxide selectivity decrease obviously. The order of the influence of solvent on epoxidation reaction: 1,2 dichloroethane>butanol>cyclohexanone>methyl cyclohexane>cyclohexanol>acetic acid.
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 nanometer TiO 2 and nanometer TiO 2/EtOH catalysts were prepared from Ti(SO 4) 2 by the liquid phase method. The properties of these catalysts were characterized using TG DTA, IR, XRD and TEM methods.. The results show that both TiO 2 and TiO 2/EtOH are anatase with the particle sizes of about 60 nm possessing excellent thermal stability. The activities and selectivities of catalysts in styrene epoxidation with t butyl hydroperoxide (TBPH) were examined and the influence of different solvents on catalytic performance was examined. When the oxidation is carried out under suitable conditions, the main product and byproduct are styrene peroxide and phenylformaldehyde, respectively. The conversion of styrene and selectivity to epoxide over nanometer TiO 2/EtOH catalyst are 34.7% and 60.0% , respectively. When cyclohexanone or 1,4 dioxane are used as solvents, the selectivity to epoxide is more than 70%. The ethanol supported nanometer TiO 2 improved the activity obviously and the suitable solvents increased the selectivity to epoxide.
