介孔Ce_xZr_(1-x)O_2的多元醇法合成及性能研究

Synthesis and Performance of Mesoporous Ce_xZr_(1-x)O_2 via Polyol Method

采用多元醇法合成了介孔CexZr1-xO2(x=0.5～0.8)复合氧化物,并运用XRD,Raman,BET,FT-IR,TG和H2-TPR等手段对复合氧化物进行了表征。结果表明,所制样品均为立方萤石结构的介孔铈锆固溶体复合氧化物,并具有较高的比表面积(133～181 m2.g-1)和较集中的孔径分布(3.7～7.7 nm)。CexZr1-xO2固溶体的晶体结构、比表面积、孔性能和还原性能均与Zr含量有关,随着Zr含量的增加,样品的比表面积和孔体积增大,孔径和晶胞参数减小。

The mesoporous CexZr1-xO2 oxide was successfully synthesized by polyol method. The prepared samples were characterized by XRD, Raman, BET, FT-IR, TG and H2-TPR. The results showed that all samples were mesoporous cubic fluorite-structured CexZr1-xO2 solid solution. They had high surface areas （133 -181 m^2 ·g^-1） and concentrative pore diame-ter distribution （3.7 - 7.7 nm）. The crystal structure, surface areas, pore performance and reduction property of mesoporous CexZr1-xO2 were related with Zr content. Increasing of Zr content resulted in increasing of surface areas and pore volume, and decreasing of pore diameter and lattice parameter.