CO oxidation over gold catalysts supported on CuO/Cu2O both in O-2-rich and H-2-rich streams: Necessity of copper oxide
CO oxidation over gold catalysts supported on CuO/Cu2O both in O-2-rich and H-2-rich streams: Necessity of copper oxide
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在富 O-2 和富 H-2 流中负载 CuO/Cu2O 的金催化剂上的 CO 氧化：氧化铜的必要性
DOI：
10.1016/j.apcatb.2019.03.081
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Sun Libo
中科院分区：
文献类型：
--
作者：
Qi Caixia;Zheng Yuhua;Lin Hui;Su Huijuan;Sun Xun;Sun Libo
为了在不受基底材料干扰的情况下阐明金铜在CO氧化中协同效应的本质，本工作制备了不同形貌的纳米铜和氧化亚铜，并在此基础上沉积了金纳米粒子。在所制备的CuO/Cu 2 O材料和相应的负载型金催化剂上考察了富氢和富氧条件下CO氧化反应。表征结果表明，未还原的Au/CuO样品中，由于Au 3+和Cu+的自发氧化还原反应，Cu 2 O基体表面以Au+-Cu 2+聚集体为主，而未还原的Au/CuO样品中既有Au 3 +-Cu 2+，也有Au+-Cu 2+聚集体，且以前者为主。对这些样品在富氧和富氢流中CO氧化的催化结果的综合分析表明，CuO物种（而不是Cu 2 O）对CO的氧化起着更关键的作用，并且Au/CuO催化剂的催化活性的提高可以归因于CuO载体与纳米金颗粒的强相互作用。
In order to clarify the nature of cooperation effect of gold–copper in CO oxidation without disturb of substrate materials, in this work we prepared nano-sized copper and cuprous oxide with different morphologies followed by the deposition of gold nanoparticles. The reaction of CO oxidation under both hydrogen-rich and oxygen-rich streams was investigated over as-prepared CuO/Cu2O materials and the corresponding supported gold catalysts. The characterizations reveal that in the unreduced Au/Cu2O samples, Au+–Cu2+assembles are dominant on the surface of Cu2O substrate due to the spontaneous oxidation–reduction reaction of Au3+and Cu+, while both of Au3+-Cu2+and Au+-Cu2+entireties are existed in the unreduced Au/CuO sample and the former is dominant. A comprehensive analysis of the catalytic results over these samples for CO oxidation in both oxygen-rich and hydrogen-rich streams demonstrates that the CuO species (not Cu2O) play a more critical role for the oxidation of CO and the improved catalytic activity of the Au/CuO catalyst can be attributed to the strong interactions of CuO support with nanogold particles.