【摘要】 A series of Ce0.4Zr0.5-xY0.1MnxO2(0<x<0.1 mol.%) oxygen-storage materials were synthesized by co-precipitation technique and characterized by Brunauer-Emmet-Teller method(BET),X-ray diffraction(XRD),Raman spectrum,temperature-programmed reduction(H2-TPR) and oxygen pulsing technique.The XRD and Raman results showed that all samples(except sample with the Mn content exceeding 0.025 mol.%) could keep the single CeO2 cubic fluorite structure after calcination at 600 and 1000 oC for 5 h,respectively.Compared with the fresh samples,the particle size of aged samples increased,but no phase separation occurred.According to the results of BET and OSC,after calcination at 1000 oC for 5 h,Mn doping could make the prepared materials maintain higher specific surface area(58.8 m2/g) and larger pore volume(0.14 ml/g).The OSC of CZYMn increased with increasing Mn content.In particularly,when Mn content reached to 0.025 mol.%,the obtained material exhibited higher OSC and lower reduction temperature.更多还原

【Abstract】 A series of Ce0.4Zr0.5-xY0.1MnxO2(0<x<0.1 mol.%) oxygen-storage materials were synthesized by co-precipitation technique and characterized by Brunauer-Emmet-Teller method(BET),X-ray diffraction(XRD),Raman spectrum,temperature-programmed reduction(H2-TPR) and oxygen pulsing technique.The XRD and Raman results showed that all samples(except sample with the Mn content exceeding 0.025 mol.%) could keep the single CeO2 cubic fluorite structure after calcination at 600 and 1000 oC for 5 h,respectively.Compared with the fresh samples,the particle size of aged samples increased,but no phase separation occurred.According to the results of BET and OSC,after calcination at 1000 oC for 5 h,Mn doping could make the prepared materials maintain higher specific surface area(58.8 m2/g) and larger pore volume(0.14 ml/g).The OSC of CZYMn increased with increasing Mn content.In particularly,when Mn content reached to 0.025 mol.%,the obtained material exhibited higher OSC and lower reduction temperature.更多还原