Pr-Zr固溶体的制备及其氧化性能研究

Synthesis, Characterization and Oxidation Activity of Pr-Zr Oxide Solid Solution

摘要:

通过共沉淀法制备了Pr0.7Zr0.3O2-δ复合氧化物氧载体，考察了制备温度、老化时间、pH以及母液浓度对Pr-Zr固溶体形成的影响，借助XRD、H2-TPR、O2-TPD和甲烷气-固反应等手段，进行了Pr-Zr固溶体制备最优路径的探索与其氧化性能的研究。结果表明：以Pr(NO3)3·6H2O和Zr(NO3)4为前驱盐，沉淀温度20 ℃、pH=12、800 ℃焙烧可制得Pr0.7Zr0.3O2-δ完美固溶体，固溶体的形成可增强材料晶格氧的移动性，从而提高其与甲烷的反应活性。

Abstract:

The Pr-Zr complex oxides were prepared by coprecipitation and the effects of the synthesis conditions on the formation of perfect solid solution were investigated. The catalytic performance of methane partial oxidation supported on the prepared samples was also studied. The Pr-Zr perfect solid solution could be synthesized under the conditions of precipitation temperature 20 oC, precipitation pH 12 and calcination temperature 800 oC through Pr(NO3)3·6H2O and Zr(NO3)4. The formation of solid solution could improve oxidative activity of the Pr-Zr due to the high oxygen mobility.