Effect of oxygen vacancies on direct N2O decomposition over ZrO2-Y2O3 catalysts
Effect of oxygen vacancies on direct N2O decomposition over ZrO2-Y2O3 catalysts
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DOI：
10.1080/21870764.2019.1675941
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发表时间：
2019-10
影响因子：
2.3
通讯作者：
Chang-Min Cho;Naoyoshi Nunotani;N. Imanaka
中科院分区：
文献类型：
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作者：
Chang-Min Cho;Naoyoshi Nunotani;N. Imanaka
摘要在具有萤石结构的Zr 1 − xYxO 2 −δ固溶体中，氧空位对N2 O直接分解催化活性的影响得到了证实。萤石型结构形成为具有少量Y3+（0.05 ≤ x ≤ 0.19）和大量Y3+（x ≥ 0.80）的样品，导致通过去除四分之一的氧阴离子而产生源自萤石型结构的C型结构。氧空位作为N2 O吸附中心和催化活性中心发挥作用，其中C型结构的YO 1. 5催化剂活性最高，在ZrO 2-Y2 O3体系中氧空位数最多。
ABSTRACT The effect of oxygen vacancies on catalytic activity for direct N2O decomposition was demonstrated in Zr1−xYxO2−δ solid solutions with a fluorite-related structure. The fluorite-type structure was formed as samples with a small amount of Y3+ (0.05 ≤ x ≤ 0.19) and a large amount of Y3+ (x ≥ 0.80), leading to the generation of a C-type structure derived from the fluorite-type structure by removing a quarter of the oxide anions. The oxygen vacancies worked as N2O adsorption sites and catalytic active sites, with the highest activity realized by the YO1.5 catalyst with a C-type structure, which contained the largest number of oxygen vacancies in the ZrO2-Y2O3 system.