A new series of bis-hydroxamic acids ligands (H2L1～ H2 L5) with alkyl ether as bridge group and their cobalt complexes were synthesized.All the new c ompounds were characterized by elemental analysis,IR, 1 HNMR and M...A new series of bis-hydroxamic acids ligands (H2L1～ H2 L5) with alkyl ether as bridge group and their cobalt complexes were synthesized.All the new c ompounds were characterized by elemental analysis,IR, 1 HNMR and MS. The diox ygen affinities of their cobalt complexes were investigated at the same time.展开更多
Cobalt-free perovskite-type oxides BaFel_yTayO3-6 （0 _〈 y -〈 0.2） were synthesized via a simple solid state reac- tion. The cubic perovskite structure can be obtained when y is over 0.1. BaFeo.Ta0.lO3-6 （BFT0.1）...Cobalt-free perovskite-type oxides BaFel_yTayO3-6 （0 _〈 y -〈 0.2） were synthesized via a simple solid state reac- tion. The cubic perovskite structure can be obtained when y is over 0.1. BaFeo.Ta0.lO3-6 （BFT0.1） membrane shows the highest oxygen permeation flux, which can reach 1.6 ml. min- 1. cm-2 at 950 ℃ under the gradient of air/He. The O2-TPD results reveal that BaFe0.9Ta0.lO3-a material shows an excellent reversibility and phase structure stability in air. The oxygen permeation flux is limited by the bulk diffusion when the membrane thick- ness is over 0.8 mm, and it is limited by both the bulk diffusion and the surface exchange when the membrane thickness is below 0.5 mm. Stable oxygen permeation fluxes are obtained during 180 h operation.展开更多
文摘A new series of bis-hydroxamic acids ligands (H2L1～ H2 L5) with alkyl ether as bridge group and their cobalt complexes were synthesized.All the new c ompounds were characterized by elemental analysis,IR, 1 HNMR and MS. The diox ygen affinities of their cobalt complexes were investigated at the same time.
基金the National Science Fund for Distinguished Young Scholars of China(No.21225625)the National Natural Science Foundation of China(No.21176087)the Specialized Research Fund for the Doctoral Program of Higher Education(No.20110172110013)
文摘Cobalt-free perovskite-type oxides BaFel_yTayO3-6 （0 _〈 y -〈 0.2） were synthesized via a simple solid state reac- tion. The cubic perovskite structure can be obtained when y is over 0.1. BaFeo.Ta0.lO3-6 （BFT0.1） membrane shows the highest oxygen permeation flux, which can reach 1.6 ml. min- 1. cm-2 at 950 ℃ under the gradient of air/He. The O2-TPD results reveal that BaFe0.9Ta0.lO3-a material shows an excellent reversibility and phase structure stability in air. The oxygen permeation flux is limited by the bulk diffusion when the membrane thick- ness is over 0.8 mm, and it is limited by both the bulk diffusion and the surface exchange when the membrane thickness is below 0.5 mm. Stable oxygen permeation fluxes are obtained during 180 h operation.
