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首页> 外文期刊>RSC Advances >Construction of Cu–Ce/graphene catalysts via a one-step hydrothermal method and their excellent CO catalytic oxidation performance
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Construction of Cu–Ce/graphene catalysts via a one-step hydrothermal method and their excellent CO catalytic oxidation performance

机译：一步水热法 构建Cu-Ce /石墨烯催化剂及其优异的CO催化氧化性能

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Cu–Ce/graphene catalysts show high dispersion of metal particles and excellent activity and stability for catalytic oxidation. In this study, a hydrothermal method was used to synthesize a series of bimetallic Cu–Ce/graphene catalysts, and the effects of the proportions of Cu and Ce on CO oxidation were investigated in detail. Indispensable characterizations such as XPS, XRD, TEM, BET, and H2-TPR were conducted to explore the effect of the Cu/Ce molar ratio and the metal valence on the activity and determine the structure–performance relationship. The results showed that bimetallic supported catalysts, such as 3Cu5Ce/graphene, 1Cu1Ce/graphene, and 5Cu3Ce/graphene, possessed significant catalytic activity. Especially, the 5Cu3Ce/graphene catalyst showed highest catalytic activity for CO oxidation, the T100 value was 132 °C, and the apparent activation energy was 68.03 kJ mol?1. Furthermore, the stability of the 5Cu3Ce/graphene catalyst was outstanding, which could be maintained for at least 12 h. Moreover, the CeO2 particles were well crystalline with the size 5–9 nm in these catalysts, and the CuO nanoparticles were well dispersed on CeO2 and graphene. Notably, the ratio of Cu/Ce in the catalyst was higher, the interaction between the Ce species and the graphene was stronger, and the Cu species were more easily reduced; this was beneficial for the oxidation of CO.
机译：Cu-Ce /石墨烯催化剂显示出金属颗粒的高度分散性以及出色的催化氧化活性和稳定性。在这项研究中，使用水热法合成了一系列双金属Cu-Ce /石墨烯催化剂，并详细研究了Cu和Ce的比例对CO氧化的影响。进行了XPS，XRD，TEM，BET和H 2 -TPR等必不可少的表征，以探讨Cu / Ce摩尔比和金属化合价对铜/铈的影响。活动并确定结构与绩效的关系。结果表明，双金属负载的催化剂如3Cu5Ce /石墨烯，1Cu1Ce /石墨烯和5Cu3Ce /石墨烯具有明显的催化活性。特别是5Cu3Ce /石墨烯催化剂对CO的氧化表现出最高的催化活性， T 100 值为132°C，表观活化能为为68.03 kJ mol ？1 。此外，5Cu3Ce /石墨烯催化剂的稳定性非常出色，可以保持至少12小时。此外，在这些催化剂中，CeO 2 颗粒具有良好的结晶度，粒径为5–9 nm，并且CuO纳米颗粒很好地分散在CeO 2上 和石墨烯。值得注意的是，催化剂中Cu / Ce的比例较高，Ce物种与石墨烯之间的相互作用更强，且Cu物种更容易还原。这对于CO的氧化是有益的。

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