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首页> 外文期刊>Catalysis science & technology >Role of different coordinated Cu and reactive oxygen species on the highly active Cu-Ce-Zr mixed oxides in NH3-SCO: a combined in situ EPR and O-2-TPD approach
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Role of different coordinated Cu and reactive oxygen species on the highly active Cu-Ce-Zr mixed oxides in NH3-SCO: a combined in situ EPR and O-2-TPD approach

机译：的角色不同的协调铜和无功高活性Cu-Ce-Zr氧物种混合氧化物NH3-SCO:结合原位EPR和O-2-TPD方法

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摘要

Novel Cu-Ce-Zr mixed oxides were synthesized by a citric acid sol-gel method, and they exhibited an excellent NH3-SCO activity (180 degrees C, TOF = 1.33 h(-1)). The finely dispersed CuO, Cu-Ce-Zr solid solution and monomeric Cu2+ ions in octahedral sites were the main active sites. The finely dispersed CuO species were the NH3 adsorption sites, and their adsorption capacity could be improved by their good reducibility. The Cu-Ce-Zr solid solution was an important intermediate in oxygen transfer from bulk to surface. In situ EPR analysis indicated that the isolated Cu2+ located in the octahedral sites was more active compared with that located in the square-planar pyramidal sites, and it induced the formation of more Cu-Ce-Zr solid solution. Meanwhile, the in situ O-2-TPD results showed that both adsorbed oxygen and bulk lattice oxygen were the active oxygen adspecies, and the adsorbed oxygen molecules were more active than the bulk lattice oxygen in NH3 oxidation.
机译：小说Cu-Ce-Zr混合氧化物合成的柠檬酸溶胶-凝胶方法,他们表现出一个优秀的NH3-SCO活动(180摄氏度,TOF =1.33 h(1))。固溶体和单体的Cu2 +离子八面体网站主要活跃网站。细分散措物种是氨吸附的网站,他们的吸附能力可以提高他们的还原性好。Cu-Ce-Zr固溶体是重要的从批量转移到中间的氧气表面。孤立Cu2 +位于八面体的网站位于价格相比更加活跃square-planar锥体网站,它诱导更多Cu-Ce-Zr固溶体的形成。与此同时,原位O-2-TPD结果显示吸附氧和晶格氧是活性氧adspecies,吸附氧分子更活跃大部分晶格氧氨氧化。

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