Dispersion Behaviors of Copper Oxide on the Mixed “CeO₂ + γ-Al₂O₃” Support

Abstract

The dispersion behaviors of copper oxide on the mechanical mixture of CeO 2 and γ-Al 2 O 3 supports, CuO/CeO 2 + γ-Al 2 O 3 , have been characterized by using XRD, LRS, XPS, UV-DRS, and TPR. The results show that copper oxide dispersed mainly on the surface of CeO 2 support, provided that the loading amount of copper oxide does not exceed the dispersion capacity of CuO/CeO 2 , ∼1.2 mmol of CuO/100 m 2 of CeO 2 (Dong, L.; Jin, Y. S.; Chen, Y. Sci. China (B). 1997, 40, 24). Increasing the CuO loading evidently leads to the formation of the dispersed copper oxide species on the surface of the γ-Al 2 O 3 support. The results have been tentatively discussed by using the incorporation model, which was proposed to describe the interaction between the dispersed species and the support previously (

Favorable synergetic effects between CuO and the reactive planes of ceria nanorods

“…However, the peak intensities are decreased for the CuO/CeO 2 -nanoparticles (figure 4 (c)) and CuO/CeO 2 nanorods (figure 4 (d)), compared with the pure ceria samples, respectively. It is well known that the decreased Raman intensity of ceria in the CuO/ CeO 2 samples is strongly related to the coverage of the CeO 2 surface by the dispersed copper oxide species [20]. And this is consistent with the XRD results.…”

“…The BET surface area of the CuO/CeO 2 nanorods is 4 (b)) show a strong Raman band at about 462 cm )1 , which have been attributed to the contribution of the CeO 2 surface due to the F 2g Raman active mode characteristic of fluorite structure materials [18][19][20]. However, the peak intensities are decreased for the CuO/CeO 2 -nanoparticles (figure 4 (c)) and CuO/CeO 2 nanorods (figure 4 (d)), compared with the pure ceria samples, respectively.…”

Tailoring the properties of BaTi0.8Cu0.2O3 catalyst selecting the synthesis method

“…The Cu-BTOsg and Cu-BBOH catalysts show a well-defined H2 consumption peak between 250 and 350ºC which corresponds to the reduction of almost all copper species as the percentage of reduced copper (included in Table 2) indicates [37]. The high H2 consumption for the Cu-BBOH catalyst corresponds to the reduction of highly dispersed copper oxide on the BaTiO3 surface which takes place at lower temperature than for the copper oxide used as reference (profile also included in Fig.6) [58,59].…”

Bimetallic Au–Cu, Ag–Cu/CrAl3O6 Catalysts for Methanol Synthesis

“…The reduction temperature for CuO species is situated in the temperature range from 200 to 250°C according to some literature data [23][24][25]. The obtained reduction profile for monometallic copper catalyst 5%Cu/CrAl 3 O 6 is [26].…”