Influence of titanium oxide on the surface interactions of MO (M=Cu and Ni)/γ-Al2O3 catalysts |
| |
Authors: | Yuhai Hu Yi Chen |
| |
Institution: | Department of Chemistry, Nanjing University, Nanjing, 210093, China |
| |
Abstract: | The influence of titanium oxide on the surface interactions of MO (M=Cu and Ni)/γ-Al2O3 catalysts has been studied by using XRD, LRS and XPS. For the catalysts with titania loadings lower than 0.56 mmol Ti4+/100 m2 Al2O3 (i.e., the dispersion capacity), the dispersion of MO oxides on the surface of γ-Al2O3 support is significantly suppressed by the dispersed Ti4+ ions. The inhibiting effect is dependent on the properties of MO oxides. When titania loadings are considerably higher than the dispersion capacity, MO oxides exhibit a rather stronger interaction with the formed TiO2 particles than the γ-Al2O3 support, and some of the dispersed M2+ ions might be accommodated by the vacant sites on TiO2. Therefore, the catalysts can be considered as the compositions of MO/TiO2 and MO/TiO2/γ-Al2O3 (dispersed titania). TPR results show that either dispersed titania or formed TiO2 particles can promote the reduction of copper oxide species, but the latter to a greater extent. Based on the consideration of the incorporation model, it is proposed that the surface structure of the support plays an important role in surface interactions. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|