CAJ | 학술논문

采用共沉淀法制备了铈基储氧材料，考察了滴定速率对该材料织构参数的影响．此外，分别将样品置于空气和氮氢混合气氛围中焙烧，考察了焙烧气氛对该材料氧化还原性能的影响．采用低温 N2吸附‐脱附、H2‐程序升温还原（H2‐TPR）及氧脉冲吸附法对材料进行了表征．结果表明，共沉淀法可以制备出结构稳定的纳米铈基材料，当盐溶液滴定速率在5～10 mL ／min 时，材料的比表面积和孔容最大，分别为190 m2／g 、0．42 mL／g ；此外，在氮氢混合气氛中处理过后能大幅度提高体相氧的扩散速率，从而提高其氧化还原性能．
채용공침정법제비료시기저양재료，고찰료적정속솔대해재료직구삼수적영향．차외，분별장양품치우공기화담경혼합기분위중배소，고찰료배소기분대해재료양화환원성능적영향．채용저온 N2흡부‐탈부、H2‐정서승온환원（H2‐TPR）급양맥충흡부법대재료진행료표정．결과표명，공침정법가이제비출결구은정적납미시기재료，당염용액적정속솔재5～10 mL ／min 시，재료적비표면적화공용최대，분별위190 m2／g 、0．42 mL／g ；차외，재담경혼합기분중처리과후능대폭도제고체상양적확산속솔，종이제고기양화환원성능．
The ceria‐based materials were prepared by coprecipitation ,and the influence of titration rate on textural properties was investigated .Additionally ,the materials were calcined in air and hydrogen‐nitrogen gas mixture ,respectively ,and the influence of calcination conditions on the redox performance of ceria‐based oxy‐gen storage materials was investigated .The materials were characterized by low temperature nitrogen adsorp‐tion‐desorption ,H2‐temperature programmed reduction (H2‐TPR) and oxygen storage capacity (OSC) .The results indicated that the ceria‐based materials prepared by coprecipitation were formed as stable nanostructure . The sample exhibited the best textrual properties when the titrational rate was 5 ~ 10 mL /min ,and the specific surface areas and pore volume were 190 m2 /g and 0 .42 mL /g ,respectively .In addition ,the sample calcined in hydrogen‐nitrogen gas mixture showed higher redox properties by improving the diffusion rate of bulk oxygen .