煅烧温度和模板剂含量对介孔氧化锆微球结构和性能的影响

Effects of Calcination Temperature and Template Content on the Structure and Properties of Mesoporous Zirconia Microspheres

以F127和十二烷基硫酸钠(SDS)为模板剂,采用溶胶凝胶法制备介孔氧化锆微球。研究了煅烧温度和模板剂含量对介孔微球结构和性能的影响。实验制得微球尺寸均一,直径900μm左右。研究发现样品的比表面积随煅烧温度的升高而减小,而平均孔径则随煅烧温度的升高呈变大趋势。低温煅烧后样品为纯的四方相氧化锆,600℃煅烧后的样品中开始出现单斜相。相同煅烧温度下,模板剂添加量多的样品比表面积和孔体积要大。模板剂添加量对样品的物相结构没有影响。

Mesoporous zirconia microspheres were prepared by a sol-gel method using F127 and sodium dodecyl sulfate（SDS） as templates. The effects of calcination temperature and the content of templates on the structure and properties of mesoporous microspheres were studied. Results show that the size of microspheres is uniform,with diameter of about 900 μm. It is found that with the increase of the calcination temperature,the specific surface area of the sample decreases,while the average pore diameter increases. After calcined at low temperature,the samples are pure tetragonal zirconia,and monoclinic phase appears after calcination at 600 °C. With the same calcination temperature,the specific surface area and pore volume of the sample with more templates are larger. The addition amount of templates has no influence on the phase structure of the samples.