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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。
Pr0.7Zr0.3O2-δ composite oxide oxygen carrier was prepared by coprecipitation method. The effects of preparation temperature, aging time, pH and mother liquor concentration on the formation of Pr-Zr solid solution were investigated. XRD, H2-TPR and O2-TPD And methane gas-solid reaction, the optimal route of Pr-Zr solid solution preparation and its oxidation performance were studied. The results show that a perfect solid solution of Pr0.7Zr0.3O2-δ can be obtained by calcination of Pr (NO3) 3 · 6H2O and Zr (NO3) 4 at a precipitation temperature of 20 ℃ and a pH of 12,800 ℃ Enhances the mobility of the material lattice oxygen, thereby enhancing its reactivity with methane.