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High efficiency and stability of Au–Cu/hydroxyapatite catalyst for the oxidation of carbon monoxide

机译：Au-Cu /羟基磷灰石催化剂对一氧化碳氧化的高效率和稳定性

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摘要

A highly efficient and stable Au–Cu/hydroxyapatite (HAP, Ca10(PO4)6(OH)2) catalyst was reported. HAP was prepared through a deposition–precipitation method. Au–Cu/HAP catalysts were obtained by a two-step impregnation approach. The samples were characterized by XRD, TEM, SEM, UV-Vis, ICP, XPS, H2-TPR, and O2-TPD. CO oxidation reaction was carried out to evaluate the catalytic performance of samples. TEM and UV-Vis results showed that the metallic particles supported on Au–Cu/HAP were smaller than those on Au/HAP, and they were highly dispersed on the HAP support. Patterns of XPS revealed that CuO nanoparticles were formed in the Cu/HAP catalyst, while CuO and Cu2O species coexisted in Au–Cu/HAP catalyst. Based on the O2-TPD data, the addition of copper to Au/HAP gave rise to more new O2 adsorption sites and bigger O2 adsorption capacity. The catalysis results indicated that the Au–Cu/HAP was capable of obtaining higher efficiency and stability compared with Au/HAP and Cu/HAP for CO oxidation. It was likely that the synergistic interaction between gold and CuOx phase created the most active sites on Au–Cu/HAP and was responsible for the enhanced activity and stability in comparison with Au/HAP and Cu/HAP.
机译：高效且稳定的Au-Cu /羟基磷灰石（HAP，Ca 10 （PO 4 ）报告了 6 （OH） 2 ）催化剂。 HAP是通过沉积沉淀法制备的。 Au-Cu / HAP催化剂是通过两步浸渍法获得的。通过XRD，TEM，SEM，UV-Vis，ICP，XPS，H 2 -TPR和O 2 -TPD。进行CO氧化反应以评估样品的催化性能。 TEM和UV-Vis结果表明，Au–Cu / HAP上负载的金属颗粒比Au / HAP上的金属颗粒小，并且它们高度分散在HAP上。 XPS的模式表明，CuO / HAP催化剂中形成了CuO纳米颗粒，而Au-Cu / HAP催化剂中同时存在CuO和Cu 2 O物种。根据O 2 -TPD数据，向Au / HAP中添加铜会导致更多新的O 2 small>吸附位和更大的O 2 吸附容量。催化结果表明，与Au / HAP和Cu / HAP相比，Au–Cu / HAP能够获得更高的效率和稳定性。金和CuO x 相之间的协同相互作用可能在Au-Cu / HAP上形成了最活跃的位点，并负责与Au / HAP和Cu / HAP相比，具有更高的活性和稳定性。

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