Nanoshaped CuO/CeO2 Materials: Effect of the Exposed Ceria Surfaces on Catalytic Activity in N2O Decomposition Reaction
Nanoshaped CuO/CeO2 Materials: Effect of the Exposed Ceria Surfaces on Catalytic Activity in N2O Decomposition Reaction
复制标题
DOI：
10.1021/acscatal.5b01044
复制
发表时间：
2015-08
期刊：
影响因子：
12.9
通讯作者：
Maxim Zabilskiy;P. Djinović;E. Tchernychova;O. Tkachenko;L. Kustov;A. Pintar
中科院分区：
文献类型：
--
作者：
Maxim Zabilskiy;P. Djinović;E. Tchernychova;O. Tkachenko;L. Kustov;A. Pintar
这项研究报告了一个彻底的调查纳米CuO/CeO 2材料作为一个有效的催化剂分解N2 O，这是一个强大的温室气体主要由化学工业产生。通过使用各种催化剂表征技术详细研究了终止CeO 2晶面（{100}、{110}和{111}）对分散在CeO 2纳米立方体、纳米棒和多面体微晶上的CuO的行为的影响。4wt%的Cu被发现作为最有利的金属负载，而较高的Cu含量导致较低的分散性和形成的显着较低的活性，隔离的块体CuO相。据发现，CuO/CeO 2固体应该能够在催化剂表面上过度的氧迁移率以及形成高度可还原的Cu缺陷位点，以确保高的本征活性。详细的研究进一步揭示了CeO 2的形态需要定制以暴露{100}和{110}高能表面平面，如CeO 2纳米棒中所存在的那样。氧气流动性
This study reports a thorough investigation of nanosized CuO/CeO2 materials as an efficient catalyst for decomposition of N2O, which is a strong greenhouse gas largely produced by chemical industry. Effect of terminating CeO2 crystalline planes ({100}, {110}, and {111}) on the behavior of CuO dispersed over CeO2 nanocubes, nanorods and polyhedral crystallites was examined in detail by using a variety of catalyst characterization techniques. The 4 wt % Cu was found as the most advantageous metal loading, whereas higher Cu content resulted in lower dispersion and formation of significantly less active, segregated bulk CuO phase. It was discovered that CuO/CeO2 solids should enable both excessive oxygen mobility on the catalyst surface as well as formation of highly reducible Cu defect sites, in order to ensure high intrinsic activity. Detailed studies further revealed that CeO2 morphology needs to be tailored to expose {100} and {110} high-energy surface planes, as present in CeO2 nanorods. Oxygen mobility ...