物理化学学报2011，Vol.27Issue(7)：1730-1736,7.
Au-Cu/CO3O4双金属催化剂上乙烯完全催化氧化性能
Catalytic Activities for the Complete Oxidation of Ethylene over Au-Cu/Co3O4 Catalysts
薛雯娟 1张新艳 1李鹏 1刘昭铁 2郝郑平 1麻春艳1
作者信息
- 1. 中国科学院生态环境研究中心,北京100085
- 2. 应用表面与胶体化学教育部重点实验室,陕西师范大学,西安710062
- 折叠
摘要
Abstract
A sedes of Au-Cu/Co3O4 catalysts with different mass fractions of Cu were synthesized by a two-step method that consists of depositing gold 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 temperatureprogrammed 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 gold 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 majodty 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 gold 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.关键词
纳米金催化材料/Au-Cu/Co3O4/乙烯/催化氧化/金铜合金Key words
Nano-goid catalyst/ Au-Cu/Co3O4/ Ethylene/ Catalytic oxidation/ Au-Cu alloy分类
化学化工引用本文复制引用
薛雯娟,张新艳,李鹏,刘昭铁,郝郑平,麻春艳..Au-Cu/CO3O4双金属催化剂上乙烯完全催化氧化性能[J].物理化学学报,2011,27(7):1730-1736,7.
