Abstract

The 5% CuO/Ce_{1 – x}Pr_xO_y catalysts were synthesized on the basis of CeO₂ and PrO₂ oxides and Ce_1 – xPr_xO_y solid solutions with x = 0.2, 0.5, and 0.8. Highly dispersed copper oxide was present in the 5%CuO/Ce_1 – xPr_xO_y catalysts. Upon interaction with the support, it formed active oxygen, which participated in CO chemisorption and a low-temperature reaction of CO oxidation in the presence of hydrogen. The highest conversion of CO in an excess of H₂ (γ_mах(Т)), which was close to 100%, was obtained at temperatures of 120–160°C on a 5% CuO/CeO₂ catalyst. Upon the modification of CeO₂ with Pr cations, 5% Ce_0.2Pr_0.8O_y sample, it decreased to 65% at 220°C due to an increase in the bond strength of oxygen in copper-containing centers. A maximum conversion of CO (93%) on a sample of 5% CuO/PrO_y was detected at 200°C. Upon the modification of PrO₂ with Ce cations, the activity of 5% CuO/Ce_0.5Pr_0.5O_y and 5% CuO/Ce_0.2Pr_0.8O_y catalysts did not exceed that of 5% CuO/PrO_y. The forms of CO and CO₂ adsorption on 5% CuO/Ce_{1 – x}Pr_xO_y samples were studied using the TPD method. In a range of 170–500°C, the desorption of oxygen from the supports of 5% CuO/Ce_0.5Pr_0.5O_y and 5% CuO/PrO_y samples was observed. The occurrence of the reaction on 5% CuO/Ce_{1 – x}Pr_xO_y catalysts was discussed. With consideration for the properties of CO complexes formed on copper-containing oxidation and adsorption centers, their participation in the reaction of low-temperature oxidation in hydrogen was examined.

中文翻译：

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5％CuO / Ce 1 – x Pr x O y催化剂在氢气过量的情况下一氧化碳氧化与氧气反应中的活性

摘要

在CeO ₂和PrO ₂氧化物和Ce _{1- x} Pr _x O _y固溶体（x = 0.2、0.5和0.8）的基础上，合成了5％CuO / Ce _{1-  x} Pr _x O _y催化剂。高度分散的氧化铜存在于5％CuO / Ce _{1 – x} Pr _x O _y催化剂中。与载体相互作用后，它形成了活性氧，该活性氧参与了CO的化学吸附和在氢存在下的CO氧化的低温反应。H ₂（_{γmах）中}的最高CO转化率  （Т））接近120％，是在5％CuO / CeO ₂催化剂上于120–160°C的温度下获得的。在用Pr阳离子（5％Ce _0.2 Pr _0.8 O _y样品）对CeO ₂进行改性后，由于含铜中心中氧的键合强度增加，在220°C下它降至65％。在200°C下检测到5％CuO / PrO _y样品上CO的最大转化率（93％）。通过用Ce阳离子修饰PrO ₂，活性为5％CuO / Ce _0.5 Pr _{0 。5} O _y和5％CuO / Ce _0.2 Pr _0.8 O _y催化剂不超过5％CuO / PrO _y。使用TPD方法研究了5％CuO / Ce _{1 – x} Pr _x O _y样品上CO和CO _2的吸附形式。在170-500°C的温度范围内，观察到氧气从5％CuO / Ce _0.5 Pr _0.5 O _y和5％CuO / PrO _y样品的载体上解吸。在5％CuO / Ce _{1 – x} Pr _x O _y上发生反应 讨论了催化剂。考虑到在含铜的氧化和吸附中心上形成的CO配合物的性质，研究了它们在氢中低温氧化反应中的参与。