Ce_(0.6)Zr_(0.35)Y_(0.05)O_2和Pr_(0.6)Zr_(0.35)Y_(0.05)O_2催化剂表面上CO氧化和^(18)O-^(16)O交换反应的研究

CO Surface Oxidative Reaction and ^(18)O - ^(16)O Isotopic Exchange over Ce_(0.6)Zr_(0.35)Y_(0.05)O_2 and Pr_(0.6)Zr_(0.25)Y_(0.35)O_2 Catalysis

测定了在Ce0.6Zr0.4O2,Ce0.6Zr0.35Y0.05O2,Pr0.6Zr0.4O2和Pr0.6Zr0.35Y0.05O2(分别表示为CZ,CYz,PZ和PYZ)样品表面上的CO氧化反应和18O—16O同位素交换反应。结果表明:在CZ和PZ系列固熔中掺杂Y3+离子可以改善晶格氧的迁移速度;PZ和PZY的晶格氧比CZ和CZY的晶格氧具有更高的氧化反应活性。其原因是将Y3+掺杂到Ce0.6Zr0.4O2或Pr0.6Zr0.4O2晶格中,增加了样品的氧空位浓度,从而提高了晶格氧的迁移性质,而PrOx比CeO2具有更低温度的氧化还原性质,因此PZ和PZY的晶格氧比CZ和CZY的晶格氧具有更高的氧化反应活性。

The CO oxidative reaction and 18O/16O ex-change on Ce0.6Zr0.4 O2, Ce0.6Zr0.35 Y0.05 O2, Pr0.6 Zr0.402, and Pr0.6Zr0.35 Y0.05O2 surface (denoted as CZ, CYZ, PZ, and PYZ) were investigated. That by incorporating Y 3+ ions into CZ and PZ , oxygen mobil- ity thronghout lattice is enhanced and the oxidative a-bility of lattice oxygen in PZ and PZY becomes higher than in CZ and CZY due to the increase in oxygen va-cancy concentration.