Sub-micrometer ultra fine CeO2-ZrO2 mixed oxides have been prepared by milling solid cerium carbonate and zirconium oxy-chloride with ammonia and followed by filtering, drying and calcining procedures. The effects of ...Sub-micrometer ultra fine CeO2-ZrO2 mixed oxides have been prepared by milling solid cerium carbonate and zirconium oxy-chloride with ammonia and followed by filtering, drying and calcining procedures. The effects of Ce/Zr molar ratio, milling time and calcining temperature on the phase composition, particle size and morphology, surface charge, as well as the polishing property were investigated. The results show that the mixed oxide calcined at 1 000 ℃ is composed of cubic ceria doped with zirconium and tetragonal zirconia doped with cerium, and the phase composition varies with calcination temperature and the Ce/Zr molar ratio. The monoclinic zirconia is observed when decreasing calcination temperature and shortening milling time, demonstrating that milling and calcining can force the phase transformation from monoclinic zirconia to cerium stabilized tetragonal zirconia and zirconium doped cubic ceria solid solutions. The removal rate for the optical glass polishing varies with Ce/Zr molar ratio. A synergetic polishing effect is found when Ce/Zr molar ratio below 4, and the optimal Ce/Zr molar ratio is 1∶1. At the same time, the cubic ceria content, density, particle size and surface charge all increase when calcination temperature increasing from 800 ℃ to 1 100 ℃. However, the particle morphology changes from disperse quasi-sphere to irregular aggregation and the maximal removal rate for optical glass polishing lies at 1 000 ℃.These facts show that the polishing property of the synthesized ceria-zirconia mixed oxide is affected by the particle physical characteristics comprehensively.展开更多
Three kinds of REO modified CeO 2 ZrO 2 solid solutions were prepared by co precipitate method.TPR and XRD measurements have been used to characterize the effect of REO on the thermal stability and oxygen storage prop...Three kinds of REO modified CeO 2 ZrO 2 solid solutions were prepared by co precipitate method.TPR and XRD measurements have been used to characterize the effect of REO on the thermal stability and oxygen storage properties of CeO 2 ZrO 2 solid solutions,comparison being made with unmodified CeO 2 ZrO 2 solid solutions.The results indicated that the addition of REO to CeO 2 ZrO 2 solid solutions obviously improved the oxygen storage properties of the three kinds of solid solutions calcinated at 773K.Except for Zr rich solid solutions,the modified CeO 2 ZrO 2 solid soltuions calcinated at 1173K show higher thermal stability and oxygen storage properties than unmodified solid solutions.展开更多
Mesoporous CeO2 was first synthesized by hydrothermal method,and then used to synthesize different contents of CuO)x/CeO2(x:molar ratio of Cu to Ce) by deposition-precipitation method.These materials were characterize...Mesoporous CeO2 was first synthesized by hydrothermal method,and then used to synthesize different contents of CuO)x/CeO2(x:molar ratio of Cu to Ce) by deposition-precipitation method.These materials were characterized by X-ray diffraction(XRD),N2 adsorption and desorption,H2 temperature programmed reduction(H2-TPR) and O2 temperature programmed desorption(O2-TPD) to study the crystal structure,surface area,and the mechanism of CO oxidation.The results show that,on XRD patterns,no evidence of CuO diffraction peaks is present until Cu loading is increased to 20%.The BET surface area decreases noticeably with the increase of Cu content.Compared with other samples,the better reducibility and activity oxygen species of(CuO)10%/CeO2coincide with its better catalytic activity.展开更多
The high-temperature oxidation resistance behavior of 7% （mass fraction） Y203-ZrO2 thermal barrier coatings （TBCs） irradiated by high-intensity pulsed ion beam （HIPIB） was investigated under the cyclic oxidation...The high-temperature oxidation resistance behavior of 7% （mass fraction） Y203-ZrO2 thermal barrier coatings （TBCs） irradiated by high-intensity pulsed ion beam （HIPIB） was investigated under the cyclic oxidation condition of 1 050 ℃ and 1 h. The columnar grains in the TBCs disappear after the HIPIB irradiation at ion current densities of 100-200 A/cm^2 and the irradiated surface becomes smooth and densified after remelting and ablation due to the HIPIB irradiation. The thermally grown oxide （TGO） layer thickness of the irradiated TBCs is smaller than that of the original TBCs. After 15 cycles, the mass gains of the original TBCs and those irradiated by ion current densities of 100 and 200 A/cm^2 due to the oxidation are found to be 0.8-0.9, 0.6-0.7, and 0.3-0.4 mg/cm^2, respectively. The inward diffusion of oxygen through the irradiated TBCs is significantly impeded by the densified top layer formed due to irradiation, which is the main reason for the improved overall oxidation resistance of the irradiated TBCs.展开更多
文摘Sub-micrometer ultra fine CeO2-ZrO2 mixed oxides have been prepared by milling solid cerium carbonate and zirconium oxy-chloride with ammonia and followed by filtering, drying and calcining procedures. The effects of Ce/Zr molar ratio, milling time and calcining temperature on the phase composition, particle size and morphology, surface charge, as well as the polishing property were investigated. The results show that the mixed oxide calcined at 1 000 ℃ is composed of cubic ceria doped with zirconium and tetragonal zirconia doped with cerium, and the phase composition varies with calcination temperature and the Ce/Zr molar ratio. The monoclinic zirconia is observed when decreasing calcination temperature and shortening milling time, demonstrating that milling and calcining can force the phase transformation from monoclinic zirconia to cerium stabilized tetragonal zirconia and zirconium doped cubic ceria solid solutions. The removal rate for the optical glass polishing varies with Ce/Zr molar ratio. A synergetic polishing effect is found when Ce/Zr molar ratio below 4, and the optimal Ce/Zr molar ratio is 1∶1. At the same time, the cubic ceria content, density, particle size and surface charge all increase when calcination temperature increasing from 800 ℃ to 1 100 ℃. However, the particle morphology changes from disperse quasi-sphere to irregular aggregation and the maximal removal rate for optical glass polishing lies at 1 000 ℃.These facts show that the polishing property of the synthesized ceria-zirconia mixed oxide is affected by the particle physical characteristics comprehensively.
文摘Three kinds of REO modified CeO 2 ZrO 2 solid solutions were prepared by co precipitate method.TPR and XRD measurements have been used to characterize the effect of REO on the thermal stability and oxygen storage properties of CeO 2 ZrO 2 solid solutions,comparison being made with unmodified CeO 2 ZrO 2 solid solutions.The results indicated that the addition of REO to CeO 2 ZrO 2 solid solutions obviously improved the oxygen storage properties of the three kinds of solid solutions calcinated at 773K.Except for Zr rich solid solutions,the modified CeO 2 ZrO 2 solid soltuions calcinated at 1173K show higher thermal stability and oxygen storage properties than unmodified solid solutions.
基金Project(2011FZ030)supported by the Natural Science Foundation of Yunnan Province,ChinaProjects(2011144,2011221)supported by Analysis and Test Foundation of Kunming University of Science and Technology,China
文摘Mesoporous CeO2 was first synthesized by hydrothermal method,and then used to synthesize different contents of CuO)x/CeO2(x:molar ratio of Cu to Ce) by deposition-precipitation method.These materials were characterized by X-ray diffraction(XRD),N2 adsorption and desorption,H2 temperature programmed reduction(H2-TPR) and O2 temperature programmed desorption(O2-TPD) to study the crystal structure,surface area,and the mechanism of CO oxidation.The results show that,on XRD patterns,no evidence of CuO diffraction peaks is present until Cu loading is increased to 20%.The BET surface area decreases noticeably with the increase of Cu content.Compared with other samples,the better reducibility and activity oxygen species of(CuO)10%/CeO2coincide with its better catalytic activity.
基金Projects supported by The 2nd Stage of Brain Korea and Korea Research Foundation
文摘The high-temperature oxidation resistance behavior of 7% （mass fraction） Y203-ZrO2 thermal barrier coatings （TBCs） irradiated by high-intensity pulsed ion beam （HIPIB） was investigated under the cyclic oxidation condition of 1 050 ℃ and 1 h. The columnar grains in the TBCs disappear after the HIPIB irradiation at ion current densities of 100-200 A/cm^2 and the irradiated surface becomes smooth and densified after remelting and ablation due to the HIPIB irradiation. The thermally grown oxide （TGO） layer thickness of the irradiated TBCs is smaller than that of the original TBCs. After 15 cycles, the mass gains of the original TBCs and those irradiated by ion current densities of 100 and 200 A/cm^2 due to the oxidation are found to be 0.8-0.9, 0.6-0.7, and 0.3-0.4 mg/cm^2, respectively. The inward diffusion of oxygen through the irradiated TBCs is significantly impeded by the densified top layer formed due to irradiation, which is the main reason for the improved overall oxidation resistance of the irradiated TBCs.
