In this research a technique for the process of ABO 3 supported on γ-Al 2O 3 was proposed, in which the modified carrier was adopted and the citric acid complexing sol-gel method was used. By means of this technique,...In this research a technique for the process of ABO 3 supported on γ-Al 2O 3 was proposed, in which the modified carrier was adopted and the citric acid complexing sol-gel method was used. By means of this technique, the activity for SO 2 reduction over LaFeO 3/γ-Al 2O 3 is as high as that over non-supported catalyst. The substitution of Sr for La and Cu, Co for Fe decreased the activity of the catalyst, especially when the reaction temperature was low.展开更多
The title nanocrystalline powders were prepared by sol-gel method, the influences of grain size on crystal structure were investigated by XRD and DSC techniques. The experiment results show that the tetragonal ferroel...The title nanocrystalline powders were prepared by sol-gel method, the influences of grain size on crystal structure were investigated by XRD and DSC techniques. The experiment results show that the tetragonal ferroelectric phase content of the powders and the Curie temperature Tc are increased with the increase of grain size. When the grain size is less than 34. 7nm, crystal structure of the particle changes into cubic paraelectric phase and the transition of ferro-paraelectric phase disappears as well.展开更多
文摘In this research a technique for the process of ABO 3 supported on γ-Al 2O 3 was proposed, in which the modified carrier was adopted and the citric acid complexing sol-gel method was used. By means of this technique, the activity for SO 2 reduction over LaFeO 3/γ-Al 2O 3 is as high as that over non-supported catalyst. The substitution of Sr for La and Cu, Co for Fe decreased the activity of the catalyst, especially when the reaction temperature was low.
文摘The title nanocrystalline powders were prepared by sol-gel method, the influences of grain size on crystal structure were investigated by XRD and DSC techniques. The experiment results show that the tetragonal ferroelectric phase content of the powders and the Curie temperature Tc are increased with the increase of grain size. When the grain size is less than 34. 7nm, crystal structure of the particle changes into cubic paraelectric phase and the transition of ferro-paraelectric phase disappears as well.
