A series of materials Ce0.3+xZr0.6-xY0.1O1.95 were prepared by co-precipitation routine and the property of these materials was studied by means of oxygen storage capacity, temperature programming reduction, X-ray dif...A series of materials Ce0.3+xZr0.6-xY0.1O1.95 were prepared by co-precipitation routine and the property of these materials was studied by means of oxygen storage capacity, temperature programming reduction, X-ray diffraction, transmission electronic microscope, and X-ray photoelectron spectroscopy. The results indicate that the materials with a low Ce/Zr molar ratio possess higher cerium atom utilization ratio, reducibility and thermal stability than the materials with a high Ce/Zr ratio, and Ce0.35Zr0.55Y0.1O1.95 possesses the best properties.展开更多
The oxygen storage material (OSM) Ce0.35Zr0.55Y0.1O1.95 was prepared by co-precipitation routine and studied by means of TEM, XRD, XPS, BET, H2-TPR and oxygen storage capacity (OSC) measurements. The results indicated...The oxygen storage material (OSM) Ce0.35Zr0.55Y0.1O1.95 was prepared by co-precipitation routine and studied by means of TEM, XRD, XPS, BET, H2-TPR and oxygen storage capacity (OSC) measurements. The results indicated that this material possessed plenty of Ce3+ and lattice oxygen vacancy (percentage of Ce3+ was 59.6%) and high cerium atom utilization ratio (80.04%). The porous material was with an average BET surface area of 97 m2·g-1 and pore volume of 0.26 mL·g-1. After aged at 1 000 ℃ in air for 5 h, the sample still possessed plenty of Ce3+ and lattice oxygen vacancy (percentage of Ce3+ was 57.1%), and showed high cerium atom utilization ratio (78.25%), and high thermal stability.展开更多
In the present paper,Ce-Zr-Y-La-Mn oxygen storage material was synthesized by co-precipitation method and characterized by X ray diffraction(XRD),BET,TG and temperature programmed reduction(TPR).The effects of textura...In the present paper,Ce-Zr-Y-La-Mn oxygen storage material was synthesized by co-precipitation method and characterized by X ray diffraction(XRD),BET,TG and temperature programmed reduction(TPR).The effects of textural and structural properties,low temperature redox behavior,and change in phase were investigated at various calcination temperatures.The XRD results show that the samples belong to the same crystalline shift at various calcinations temperature and the fluorite structure of the precipitation keeps unchanged.The new phase is not separated from the solid solution after calcined at 1000℃.The BET results show that the surface area of the sample reaches 45m2/g after aging 5h at 1000℃.The TPR results show that the sample indicates best reducibility calcined at 600℃.展开更多
文摘A series of materials Ce0.3+xZr0.6-xY0.1O1.95 were prepared by co-precipitation routine and the property of these materials was studied by means of oxygen storage capacity, temperature programming reduction, X-ray diffraction, transmission electronic microscope, and X-ray photoelectron spectroscopy. The results indicate that the materials with a low Ce/Zr molar ratio possess higher cerium atom utilization ratio, reducibility and thermal stability than the materials with a high Ce/Zr ratio, and Ce0.35Zr0.55Y0.1O1.95 possesses the best properties.
文摘The oxygen storage material (OSM) Ce0.35Zr0.55Y0.1O1.95 was prepared by co-precipitation routine and studied by means of TEM, XRD, XPS, BET, H2-TPR and oxygen storage capacity (OSC) measurements. The results indicated that this material possessed plenty of Ce3+ and lattice oxygen vacancy (percentage of Ce3+ was 59.6%) and high cerium atom utilization ratio (80.04%). The porous material was with an average BET surface area of 97 m2·g-1 and pore volume of 0.26 mL·g-1. After aged at 1 000 ℃ in air for 5 h, the sample still possessed plenty of Ce3+ and lattice oxygen vacancy (percentage of Ce3+ was 57.1%), and showed high cerium atom utilization ratio (78.25%), and high thermal stability.
文摘In the present paper,Ce-Zr-Y-La-Mn oxygen storage material was synthesized by co-precipitation method and characterized by X ray diffraction(XRD),BET,TG and temperature programmed reduction(TPR).The effects of textural and structural properties,low temperature redox behavior,and change in phase were investigated at various calcination temperatures.The XRD results show that the samples belong to the same crystalline shift at various calcinations temperature and the fluorite structure of the precipitation keeps unchanged.The new phase is not separated from the solid solution after calcined at 1000℃.The BET results show that the surface area of the sample reaches 45m2/g after aging 5h at 1000℃.The TPR results show that the sample indicates best reducibility calcined at 600℃.
