Citation: XUE Wen-Juan, ZHANG Xin-Yan, LI Peng, LIU Zhao-Tie, HAO Zheng-Ping, MA Chun-Yan. Catalytic Activities for the Complete Oxidation of Ethylene over Au-Cu/Co₃O₄ Catalysts[J]. Acta Physico-Chimica Sinica, ;2011, 27(07): 1730-1736. doi: 10.3866/PKU.WHXB20110719 shu

Catalytic Activities for the Complete Oxidation of Ethylene over Au-Cu/Co₃O₄ Catalysts

1.
1. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, P. R. China;
2. Key Laboratory of Applied Surface and Colloid Chemistry (Shaanxi Normal University), Ministry of Education, Xi′an 710062, P. R. China

Received Date: 7 April 2011
Available Online: 25 May 2011

A series of Au-Cu/Co₃O₄ catalysts with different mass fractions of Cu were synthesized by a two-step method that consists of depositing ld and copper onto a Co₃O₄ support, which was synthesized by coprecipitation. The effect of copper on the catalytic activity of Au-Cu/Co₃O₄ was evaluated for the complete oxidation of ethylene at different temperatures and the prepared catalysts were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), H₂ temperature- programmed reduction (H₂-TPR), and O₂ temperature-programmed desorption (O₂-TPD). The results show that Au-Cu/Co₃O₄ bimetal catalysts exhibit higher catalytic activities than the Au/Co₃O₄ catalyst. At a ld loading amount of 4% (w, mass fraction) the AuCu₃/Co₃O₄ catalyst gives higher catalytic activity compared to catalysts AuCu/Co₃O₄ and Au₃Cu/Co₃O₄. Ethylene conversion was 15.3% for AuCu₃/Co₃O₄ even at 0 ℃ whereas at 120 ℃ the full conversion of ethylene was obtained. The results of XRD and HRTEM indicate the formation of an Au-Cu alloy in AuCu₃/Co₃O₄. However, we have found that the majority of Cu is present in the form of Cu2O in Au₃Cu/Co₃O₄. The interaction between Au and Cu on the surface of the catalysts decreases the particle size of the ld and, therefore, it is much easier to activate ethylene. H₂-TPR and O₂-TPD results show that the high reduction ability and the high intensity of surface oxygen active species contribute to the excellent catalytic activity of the AuCu₃/Co₃O₄ catalyst.
- Nano- ld catalyst,
- Au-Cu/Co₃O₄,
- Ethylene,
- Catalytic oxidation,
- Au-Cu alloy
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沈阳化工大学材料科学与工程学院沈阳 110142

Catalytic Activities for the Complete Oxidation of Ethylene over Au-Cu/Co3O4 Catalysts

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Catalytic Activities for the Complete Oxidation of Ethylene over Au-Cu/Co₃O₄ Catalysts