MoO3负载在新型TiO2/γ-Al2O3载体上的表面状态与性质

MoO_3担载在TiO_2或γ-Al_2O_3载体上是一类重要的工业催比剂, 其表面状态和表面性质国内外已有过许多报导, 本文报导~1-5], MoO_3负载在我们所研制的新型TiO_2/γ-Al_2O_3载体(指以γ-Al_2O_3为骨架, 表面上铺以TiO_2物种的载体)上的表面状态与性质。

Surface State and Properties of MoO3 Supported Onto the Surface of TiO2/γ-Al2O3

In this paper, surface state and properties of MoO_3 supported onto the surface of TiO_2/γ-Al_2O_3 carrier (i. e. TiO_2 supported onto the γ-Al_2O_3) are reported. Carrier we selected is S-20 of which TiO_2 loading is 0.20 g/g γ-Al_2O_3. The physico-chemical properties of the carrier was described in reference6]. MoO_3 supported on carrier was prepared in two ways: one is general impregnation method and another is that the MoO_3 and S-20 powders were mixed throughly and then the mixture was calcined at 450 ℃ for 24 hrs. The surface state of MoO_3/TiO_2/γ-Al_2O_3 was characterized by using of it are quite different from MoO_3 supported on TiO_2 or γ-Al_2O_3. This results are of benefit to developing new catalysts.The experimental results of XRD quantitative analysis and XPS intensity ratio and LRS quantitative analysis show that the utmost monolayer dispersion capacity of MoO_3 supported on TiO_2 or γ-Al_2O_3 meets the calculated value very well. It illustrates that the new carrier we made has an ability to increasing the MoO_3 dispersion capacity to 23% more.The results of LRS and ammonia leaching and XRD..