Investigation of the physicochemical properties of CuO-CoO binary metal oxides supported on γ-Al2O3 and their activity for NO removal by CO.
The dispersion and physicochemical behaviors of CuO-CoO binary metal oxides supported on γ-Al(2)O(3) were characterized by XRD, LRS, XPS, H(2)-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 γ-Al(2)O(3) support; (b) the interaction between dispersed CuO and CoO upon γ-Al(2)O(3) 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 γ-Al(2)O(3); (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-□-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.
Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China.
Yuanyuan
Y
Lv
Hongliang
H
Zhang
Yuan
Y
Cao
Lihui
L
Dong
Lingling
L
Zhang
Kaian
K
Yao
Fei
F
Gao
Lin
L
Dong
Yi
Y
Chen