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共沉淀水热回流法中pH值对合成铈锆储氧材料的影响 被引量:2

The effect of pH values on the properties of ceria-zirconia oxygen storage material synthesized by coprecipitation-reflux method
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摘要 研究采用共沉淀水热回流法,在聚四氟乙烯反应器中合成系列铈锆固溶体储氧材料;研究水热回流时的pH值对合成铈锆固溶体储氧材料的影响。用XRD、低温N_2吸附-脱附和H_2-TPR等手段对合成样品的物化性能进行表征,结果表明,在研究的pH值范围内,控制水热回流时溶液的pH值为11时,合成铈锆固溶体的性能最佳,经600℃焙烧5h后,其比表面积最高可达91.1 m^2/g,孔半径集中分布在3.9nm左右,总孔体积为0.22cm^3/g;且其具有最低的还原温度,储氧量为309μmol/g。此外,经1 100℃焙烧5h后仍无晶相分离现象,说明其具有良好的热稳定性能。 A series ceria-zirconia solid solution oxygen storage materials were successfully synthesized by copre-cipitation-reflux method. The reflux treatment of freshly precipitated cerium-zirconium hydroxides was carried out in a teflon flask. Effect of the pH of the precipitated solution on the synthesis of ceria-zirconia solid solutionoxygen storage materials was studied. The samples were characterized by X-ray diffraction, N2 physical adsorp-tion and hydrogen temperature programmed reduction. The results show that by controlling the pH of the pre-cipitated solution at about 119 the obtained sample exhibited the best properties. After calcination at 600 °C for 5 h, it not only has a high surface area approaching to 91.1 m2/g, a narrow pore radius size distribution centered on around 3.9 nm, and a pore volume of 0.22 m·Vg, but also has the lowest reducible temperature with the total oxygen storage capacity up to 309 jumol/g. Furthermore 9 after calcination at 1 100 °C for 5 h 9 the samples still have a single phases which indicates its high thermal stability.
出处 《功能材料》 EI CAS CSCD 北大核心 2017年第7期7088-7092,共5页 Journal of Functional Materials
基金 国家自然科学青年基金资助项目(21403035) 福建省教育厅产学研资助项目(JA12023) 福建省自然科学基金资助项目(2017J01414 2016J01057) 福建省中青年教师教育科研资助项目(JA13041)
关键词 铈锆储氧材料 制备 回流法 ceria-zirconia oxygen storage material synthesis reflux treatment
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