Investigation of the physicochemical properties of CuO-CoO binary metal oxides supported on 纬-Al₂O₃ and their activity for NO removal by CO

详细信息	查看全文 | 推荐本文 |

• 作者：Yuanyuan Lv^a ; Hongliang Zhang^a ; Yuan Cao^a ; Lihui Dong^a ; Lingling Zhang^a ; Kaian Yao^b ; ^{yaokaian@yahoo.com.cn} ; Fei Gao^c ; Lin Dong^a ; ^c ; ^{donglin@nju.edu.cn} ; Yi Chen^a
• 关键词：CuO&ndash ; CoO/纬-Al2O3 ; Cu&ndash ; O&ndash ; Co species ; NO&ndash ; CO reaction ; Incorporation model ; Surface synergetic oxygen vacancy
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 期刊代码：125_00219797
• 类别：ch
• 出版时间：15 April, 2012
• 卷：372
• 期：1
• 页码：63-72
• 文件大小：1177 K

摘要

The dispersion and physicochemical behaviors of CuO-CoO binary metal oxides supported on 纬-Al₂O₃ were characterized by XRD, LRS, XPS, H₂-TPR, and in situ FT-IR techniques. Their activities were evaluated by NO-CO model reaction. The results indicated that (a) for lower loadings, CuO and CoO were able to be highly dispersed on the surface of 纬-Al₂O₃ support; (b) the interaction between dispersed CuO and CoO upon 纬-Al₂O₃ was discussed in the view of incorporation model. According to this model and obtained results, the surface dispersed Cu-O-Co species were considered to exist on the surface of 纬-Al₂O₃; (c) CO or/and NO adsorption FT-IR results evidenced that the surface dispersed copper species could be reduced to lower valence by CO and the NO adsorption species converted with the increase in the temperature; (d) the surface dispersed Cu-O-Co species could be reduced to active Cu-鈻?Co species by CO among the mixture atmosphere. The formation of the surface synergetic oxygen vacancy (SSOV) was a crucial factor in the process of the NO-CO reaction. And a possible reaction pathway was tentatively proposed to discuss the NO-CO reaction based on all of these results.